Best gmt400 to gmt800 brake upgrade. New posts Search forums.
● Best gmt400 to gmt800 brake upgrade . The factory gear ratios for teh rear are the same as the fronts. This also applies to 4wd's as well. Found a pretty significant leak on the hydroboost unit in my '99 3/4 ton Suburban yesterday. A GMT800 master cylinder would be a great upgrade. NG from OH The setup I ended up going with is the 8600 GVWR master cylinder and front calipers with the 7600 GVWR pads (caliper bolts up, clip on inner brake pad needs to be tweaked), C1500 brake rotors, and C1500 Suburban rear brakes (11" drums). Thread starter 99GMT425; J/K I understand the attraction of better brakes. This idea came from my research which showed that the new trucks use a huge rotor but share the 6x5. I can't change the push rod length. to the top of the spindle and using the gmt400 tie rod or purchasing an adapter to use the gmt800 tie rod. Except that on a 1500 GMT400, you almost certainly have low-drag calipers, and the GMT800 master cylinder does not have the third, gigantic piston at the back that the low-drag calipers require. Thread starter spasm3; Start date Feb 2, 2019; Status Not open for further replies. I just bought a 99 K1500 suburban JB6 brake package. 338" bores (34mm) and others 1. New Anyone have knowledge or tips for doing the big three upgrade in a gmt400 before i get started? Thanks! Reactions: DixieMafia251 and HotWheelsBurban. If you've got stock "1500" calipers, the best thing you can do is get a stock master cylinder for JN/JB/JD5 or 6 brakes having the 1 1/8" bore, and GET RID OF THAT "NBS" MASTER CYLINDER. Thread starter nick7269; Start date Oct 25, 2022; Your best bet would be to go to the auto salvage yard and buy a pair of steering knuckles complete with hubs, brake rotors, calipers, ABS sensors, etc. New posts Latest activity. That "dead spot" that I know these trucks are famous for is gone. The firm pedal is nice, but you are decreasing your brake system effectiveness in the process. im looking to go with the gmt800 MC but not sure which is best to go with or if anything newer works aswell. I just watched this guy swap GMT 800 front brakes into his K2500 suburban. 'Course, if they'd used the proper fully-functional QTU master, the brakes would have worked even better. You'd be lucky, avoiding the horrible 254mm The nbs master cylinder is meant for rear disc. Me? I upgraded my K1500 pickup to the brake system your 'Burban has now. I have been working on a budget "big brake" upgrade for my 93 Burb, consisting of the new 2019+ Silverado 13. I was going to just do the GMT800 upgrade, but it's much easier to get the rear drum master cylinder for the gmt900. Members. Anybody know of kits that give it a little more stopping power that aren't crazy expensive? The above (plus GMT800 master cylinder) will get you Astro/GMT800 brakes on a 2WD. com) AND swap to a GMT800 MC and braided hoses on front and rear. 4 disc brakes are nice. JB3 - '88-90 C1500 V6, etc. I decided to try the brake upgrade that Lawrence Tolman was showing on his Youtube channel. theres a bunch of different brake rpo codes and they all have different specs. I’m afraid that when people report better braking, it is because of removing worn hardware for new. I cover the most common GMT400 brake upgrades. I found a hub that bolts to the GMT800 spindles that is 5-lug (although its 5. The door hinges on gmt400 suck! I can't picture how it's an upgrade to let go of the 96 in favor of the 01. At any rate, I had to lay in to the brakes pretty good today and I was not pleased with the results. 1999 k2500 crew cab 7. (pn: 131-66008) My original plan was to switch to rear disks but @Schurkey made some good points in a couple different threads about those So, you have a GMT 400 truck, but the brakes are somewhat crummy You have some options. I came across several videos that junked the nbs rear disk and put a front disk from a gmt400 on the rear of a gmt800 with a bracket from some company. Were I to repeat the brake upgrade process on another GMT400, I'd just start with the HB and likely be done at that point. The NBS master cylinder upgrade is a good one because it is a non-stepped master cylinder and doesn't have all the QTU bits I didn't notice any significant braking improvement. Hell Brembo even has a 6 piston caliper / 16" (16"!!!) front rotor option for GMT900's but it's $2K+ and requires 20"/22" wheels (and Has anyone tried the brake upgrade using the 2019 and up rotors and four piston calipers? Forum: Suspension, Steering & Brakes; Random media. I'm looking at 1998 Chevy K3500 My nosing around reveals that the track width for a GMT400 is in the 63. Thread starter 99GMT425; a good set of Hellcat front brakes can be had used for about $1000-$1200 or so. 8, and a Crew Cab 2010 2WD Sierra GMT900. 6" rotor. For those with 6 lug wheels, you DO They have in my opinion the best type of Parking brake set up, (Drum inside the disc, GMT800 rear discs are the same). I picked up a GMT800 hydro master cylinder for it because of threads like this and it wouldn't fit the 400 booster. Brake booster upgrade? It's time to replace the booster in my '88 k1500 5. 1 of 3 Go to page. Your best bet would be to go to the auto salvage yard and buy a pair of steering knuckles I'm in the process of finishing the the 800 dual piston brake upgrade. So am I correct in that a proportioning valve? along with an upgraded master cylinder is the best initial route to get the truck on the road. Checking total piston surface area it looks like the dual piston gets you about 11% more braking force. 0 had a 10. Reply reply The latest combination is the best yet - non-slotted rotors married with EBC Greenstuff pads, I think the rotors are ATE Professionals and they have done well, but it is the pads that are the key IMO. Thread starter Garyg; Start date Mar 2, 2022; less when I did the GMT800 master, and finally good when I hydroboosted all of that with the matching GMT400 master for the non-quick take-up brakes. The new brakes are off a 04 awd escalade. Oh, and another thing; A Jeep SRT8 uses a 15" rotor that is 5x5. This is what I did to make my 98 k1500 truck stop amazing. I'm going to upgrade my master cylinder and brake booster since they're both questionable. 285" diamter piston. Latest: ORVietVet; Tuesday at 11:35 AM; Introduction. GMT400 Brake The cherry on top is the hydroboost with HD master cylinder, truck will lock the 33s down hard since merely adding HB. 5 FF from a GMT 800 2500HD. The push rod distance was different between the GMT400 and GMT800 also. No one is ever gone if they are always remembered. Needing some advice for a radiator replacement / upgrade. Similarly, some GMT800 MCs have 1. I know the GMT900 14 bolt from the 4x4 is near identical width to the GMT800 and we are swapping a 4x4 GMT900 14 bolt in my friends 2000 Chevy 2wd. It is nothing like doing the gmt-800 conversion, but Has anyone tried the brake upgrade using the 2019 and up rotors and four piston calipers? Found this video on it. Thread starter MMcc; (brown) was a turn-on trigger thats it. Jun 25, 2020 #7 Yes the Hydroboost compared to vacuum is day and night difference. This is just a fear, not a fact. Next Last. For the 3/4 ton/1-ton trucks, the 99-00 I have been searching the net about brake upgrades. Combine that with a GMT800 1/2 ton master cylinder and braided hoses helps a lot. GM offerred these from the factory on TAHOES sold for police and fire department Swap to the 3500 dual rear wheel calipers, pads, and rotors, that's it. i know ill need a proportioning valve npt sure what to get and the BLF-26C adapter, im in the process of do a sas with a 08 ford SD dana60. Nov 26, 2020 #8 L31MaxExpress I'm Awesome. I’ve read up on the GMT900 brake upgrade. The problem in doing the gmt800 and 900 swap is the lower control arms and balljoints. Now, the brake pedal is without question firmer. 125, so the bigger bore has lower line pressure but higher volume of fluid moving, to me it feels like there's less take up in the pedal, the science says you should have to hit the pedal Hello I see a lot of people asking about Hydroboost swap's, so I thought I would do a little write up on one of these swap's. 15" diamter piston, and dual rear wheeled trucks used a 3. I did buy a NBS master cylinder and stainless steel brake lines (not installed yet). I want to measure a 800 vacuum master to see if it would fit in the 400 hydrobooster. I will need something heavy duty as I am lugging a 9. I had an Allstar Performance 9. Make sure your rear brakes are in good condition and adjusted If this actually works this will be an awesome upgrade to get some real brakes with a wheel pattern that hasn't gone the way of the dinosaur lol. It all bolts right on, and gives a nice bump in front braking. My truck stops amazing, has a fully functioning stock parking brake setup, everything is GM and it was pretty cheap to do all of it. My thought is just replaced all the wearable brake parts with good quality parts and except the stopping power for what it is up front with stock 1/2 ton pads. The OBS trucks are known for a horrible squishy brake pedal. Try to find/get a GMT400 HB unit if you want all 4 bolts otherwise do what I did and punch one of them out or drill a new hole for the GMT800 unit. Perhaps some of the different feeling is from the bigger drums/shoes. Good point, they are dual piston. 8 good enough for our needs? 1994 Silverado C2500 Master Cylinder Upgrade to Dorman M630031, Brake Line Adapter: BLF 26 (1/2M – 9/16F). You can either Sorry guys with 6 lug trucks and the 10 bolt axle, I'm unaware of any brake upgrades for them. littleshopmfg. If they had the disc brakes in the rear, they had the smaller brakes up front). 3L. Thank you for pointing that out, I was not aware. Also subscribing for interest This thread is older than I remember. 94 diameter piston. float rear axle upgrade and will give me 13" brakes in the rear but still using 8. 3, V8 325,000 miles, leaks oil now at rear main seal stock 4L60E on 5th filter/fluid change; 2nd set of drive shaft u-joints; rear diff new bearings; 2nd fuel pump and fpr; ABS pump circuit solder reflowed; 5th water pump; 2nd fan clutch; new front wheel bearing units; new front and rear shocks; 1000# I completed this swap and the GMT800 brakes are an improvement, but the pedal still requires too much effort to bring the truck to a stop. My plan is to do a rear disc upgrade from Little Shop MFG (www. Now on to the front brakes. Now, you can find the older style 14 bolt FF under the CUCV trucks. 94" diameter piston in the front calipers, 8 lug single rear wheeled trucks used a 3. Latest: ORVietVet; Monday at 1:48 PM; Introduction. There are some pretty good options for GMT800 and GMT900 trucks that would be awesome on a GMT400. On the other hand. Those Raybestos EHT369H brake pads sound good. i just deleted the abs. I was going to swap into my project truck, but it never happened. The Suburban may be a good compromise, it's the best towing out of the bunch, but not by a lot. New posts Search forums. Just got around to doing the brake lines from the abs out before this winter. Drum brakes perform just as good, if not better. I was going to use them in my Big Brake convertion, but they were to big to fit on the The GMT900 brake upgrade not only came on some GMT800 Silverado and Sierras, (If they got good brakes in the front, they had drums in the rear. im pretty sure that i have a sticking caliper and was thinking about upgrading them since i do have the 3/4 rear endthose brakes work alot faster than the front ones do from higher speedsthe rear will lock up long before the front even thinks about im gonna have to get me some 2500 front calipers now My 2003 2500HD crewcab Duramax weighs in at ~4 tons and thanks to hydroboost (and much better rotors and calipers) , it will stop on a dime. Didn't seem to be much interest here. If you want the GMT800 master, you need to swap the whole brake system over, otherwise you can set up a brake system with a firm-feeling pedal that fails on you in an emergency stop. Took me awhile to find a good core and it was off a '98 that had minor rusting of the 2 rad mount pads. this is why sometimes when people swap in a gmt800 MC and report having good brakes and others report a severe down grade. I really need 6-lug conversion because I have NNBS wheels coming. and for the gmt800 master swap to work, we’d need a QTU master Unless you changed the front calipers to ones that DON'T have the low-drag feature, this was a huge mistake. Many people swap the master cylinder from a GMT800, is that what you're thinking of? From what I remember the brake booster is the same for all GMT400 1500/2500/3500. Thread starter Joined May 30, 2010 Messages 17,414 Location North Carolina. If you do this brake swap on your OBS truck you will be amazed at the difference. 5" bolt pattern and 78mm center bore diameter as the OBS K1500 rotors. The nbs mc does not. schiker Well-Known Member. Anyhow, I did the GMT800 front knuckle/ brake "upgrade" along with the GMT800 master cylinder. Everything I've read either talks about rotating the tie rod. In looking at this, I also wondered if there might be clearance issues with the much larger NBS brakes in full lock turning. I have a 1989 K3500 SRW. Mainly the GMT800 MC firming up the pedal was the difference I felt. With the replacement parts situation I am thinking that a ABS delete leading to a full new brake system later on in the process. JasonPayneMemorial I had read on some other forums that the brake master cylinder from a 2000 Silverado was the right upgrade for our trucks, the gmt800 1500 master bore is 1. The GMT800-style master cylinder cannot work properly with low-drag '97 K2500 Brake upgrade to K3500 GMT400 ?'s. Latest: movietvet; 48 minutes ago; For Sale. 56 degree/2" taper reamer to enlarge the GMT800 knuckle's upper ball joint taper to fit GMT400 balljoint. 3 is the most desirable engine in the world right now. Without 4 wheel discs, big rotors, and 2 piston calipers, I believe this is doable. Can be installed with some modifications in a gmt400. It possibly could, but I have a GMT400 hydroboost sitting on the shelf to install in my truck. I could simply swap out with another gmt400 master but was curious is I could keep the gmt400 hydrobooster and upgrade the master from a gmt800. 15 aka 80mm and 3. The stopping power is night and day difference. I've got a 14 bolt 10. Just checking to see if someone has done it before. The rear brake upgrade made MORE difference than NBS/Astro knuckle brake upgrade. If I can somehow make the gmt800 parts work, I could upgrade my suspension to say Kryptonite parts, which seem to have everything awesome for the 8 lug gmt800 I see GMT800 brakes for sale in the forum, what's the ball joint story? Confused about brake upgrades for 93 K1500. On most of these trucks the back brakes dont work unless you adjust them. "All you need is a NBS MC and a fitting" to convert the one port to correct size. Good luck finding one at a junkyard in 5 years Sent from my SM-N960U using Tapatalk GMT400 Upgrades and Performance Parts Buyers Guide. My truck came with a 14 bolt with 4. See disclaimer below. I have a 88 GMC K2500 with 6 lug wheels. you can even throw a locker in the front diff of the 3/4 or 1 tons. Bought to tow a small travel trailer (4500lbs loaded) dual axle. Really been happy with the swap. Has anyone upgraded to the 3. Gmt400 to gmt800 conversion e-brake cables????? Thread starter inscarguy; Start date Aug 21, 2018; For the rear, only the 14bsf of of another OBS is a direct swap. New posts Search forums In this video I walk you through upgrading a GMT400, or 88'-98" Chevy/GMC brake master cylinder. 5 im building, im thinking this could work. 4l. I have come There are many GMT400 upgrades centered around the brakes. 5 full float all factory disk brake with internal parking brake from what I have seen. I did 02 Escalade front knuckles/ rotors/ calipers and an 02 Silverado master cylinder. I'm perfectly happy with it. The reason why I am doing so is because I am going from torsion bars to coilovers for comfort and a better ride quality! I also want to make the bolky lower control arm to a more sleek and Anyway, on my 2000 Z-71 Tahoe I am replacing/upgrading to a 2006 Master Cylinder, so I'll need to do a real good ABS bleed after hooking it up. bought with upgraded brakes, 4 wheel disc , from a gmt800. New brakes and interior goes. I bled out The basis design is quite similar to our GMT400 trucks, but you can see a number of ways that GM reinforced the frame structure and near-completely boxed-in the frame transition point, as well as the front framerail section and above the middle of the spring perches. The lower control arm 8lug control arms gmt400 gmt800 k2500 modified suspension upgrade upper control arm Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. But YOU better know. Going to do the master cylinder with an aftermarket residual pressure valve this spring. it's just simply mismatched parts. Them being single piston calipers, does not really make them inferor to the gmt800 rears, but might come into play when finding a So in my research on the NBS front brake upgrade for our trucks, I've noticed a couple things I wouldn't mind getting a clear question to, I've seen tons of stuff for half tons, but with FSC being gone I can't find much on this swap for K2500/K3500s. I had planned on downgrading to 15" wheels/bias ply tires for off-road use, but never did. If I ever find the "right" gmt800 with the 8. It looks like it’s based off a 4WD Astro van. The most popular GMT400 brake upgrades include: GMT400 rear disc brake conversion; GMT800 brakes The Powerstop upgrade is I think a good upgrade. I was supprized that the diameter of GMT400 is that big. My goal with this project was to upgrade the brakes on a 1999 k1500 suburban to roughly 70-80% of the GMT800 (NBS) duramax. 457" bores (37mm). The truck I'm considering has 4wd, 6. ill be upgrading the rear About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright There's nothing to "change" when swapping to an 11" drum rear axle, it's a bolt in affair. Hi, A couple years ago I changed the rear cables and the equalizer/adjuster on my parking brake (The adjuster snapped). I believe the PPV tahoe brakes are the same as that performance brake system but with uncoated calipers. This is something I also have been doing a lot of research on, and have both a GMT400 complete subframe and a GMT800 subframe Im trying to compare and see what and how to swap over a few pieces. AFAIK the GMT400 calipers having the larger bores (3. Either the brakes aren't assembled properly, or your ABS isn't functioning correctly. Same as what the SSBC big brake front kit requires. 10 gears and G80. I also had to use 08 tahoe front CV shafts. 7. Go. 38 aka 86mm, typically deployed on 2500/3500s with JB7/JB8 brakes), are not the "low-drag" type so the NBS MC will work well with I finished my brake upgrade on my 88 GMC K2500 6 lug (7200lbs). I got mine off a 2000 Z-71 which had 12-inch rotors for use with 16-inch wheels. Towards the end he mentions a hydroboost master For those with 6 lug wheels, you DO have an easy to swap in factory brake upgrade in the 8 lug single rear wheeled pads and calipers. I compared pics of a bare GMT800 and a GMT400. 5' camper around full-time on this truck. I honestly didn't realize it was that difficult. Thread starter Gibson; Start date Oct 9, 2024; What is the difference between GMT800 upper control arms and GMT400? It seems that if the lower control arms are compatible, there should be an equivalent for the upper ones as well. how to justify an expensive swap/redesign of the vehicle brake system when one travels only 700 miles a year, when keeping the OE system in tip-top shape costs nothing but a few mins adjusting as @Keeper suggested. I've had my share of GMT400's but this one needs a brake overhaul. how different are the GMT400 and GMT800 knuckles, i plan on running 35x12. Recently discovered my master cylinder in leaking in the front. Considering an upgrade to a GMT800 master It's not an upgrade. I don't need it to stop on a dime, just need it better than what it is now. Oddly, on RockAuto, I find disparities in the specs. I had read a bit about folks upgrading to a GMT800 brake setup but haven't been able to find anything definitive in my google research. Big brake kits would be cool and all but these will still make a good upgrade. Jan 26, 2022 #2 Good idea to ( in-line fuse ) big 3 upgrade. I cut the mounting bracket in half and slide it forward 1 3/4in. I installed a GMT400 ring on the GMT800 booster. Reactions: stutaeng. What's new. New brake booster, new gmt800 cylinder, new calipers, everything in rear drums new, new rubber hoses on the front, rear still has old hoses but basically my entire brake system is new besides that Its been proven here that if you just do the GMT800 master with GMT400 other components it'll be worse than the 400 master. The Pedal came from a 96 C3500. Selling the 1990 K2500 ext cab short bed-$12k-Or Best Offer. Donor truck was a 2003 2500hd. spasm3. Then Unless you are an accomplished fabricator that has access to a good welder, plasma cutter, press brake, large drill press, possibly an 'ironworker' I wouldn't even attempt a body swap. That said, the H2 was based on the '02 -'07 GMT800 2500HD chassis. I might need to go put the bracket and rotor off my dads truck now. The front brake upgrade was noticeable. Is it worth needing new wheels and all the expenses to upgrade? My old K1500 had a gmt800 Tahoe MC, gmt800 single piston rear disks and 8 lug front calipers and that was by far the best K1500 brakes I’ve ever driven My K3500 is getting the Lugnut4x4 rear disk conversion with JB7 calipers so I’m curious to hear feedback on the negatives of that setup Not sure on that one. 50R18s(at the smallest) on my 88 and I dont trust the stock brakes with my 31s. I also had the mechanic install an extended rear SS brake line I bought 6 years ago (Skyjacker brand) and that probably helped too. Compare the GMT400 to GMT800 in this area noticably better look at a gmt400 heavy half or 3/4 or 1 ton frame/axle. I drilled to holes in it, put two bolts in, and I used the Just watched a video on YouTube showing how you can basically bolt on gmt800 2500hd/3500 knuckles/spindles lower/upper control arms calipers and rotors on our gmt400 2500s. 2005-2006 SILVERADO/SIERRA 1500 EXCLUDING: Hybrid, SS, HD So I have a 98 k1500 with a 6 lug 14 bolt rear end and JB6 brakes. It takes way more effort than most folks realize to properly It is an adequate replacement for the 5. (just an example, I'm not sure what years the JB3s were available). The front ends on the 2wd 2500 non HD are coil sprung like the 1500 2wd but with 8 lug. Then you have other issues to deal with - steering column, parking brake cables, brake booster / MC issues, etc. Is it worth upgrading to a longer wheelbase GMT800 or GMT900 Suburban or Sierra/Silverado Crew Cab? Is the 4. i was searching today for how to fit 15” wheels with gmt800 rear disk brakes. The GMT400 platform was introduced by General Motors in 1988 and spanned through Well, the time has arrived, Us 2wd Guys can have the same brake upgrade as the 4wd guys, anyone intersted I'll Post some pics and parts list once completed. The economics of an upgrade are really reasonable: I bought the '96 for $3500 about 10 years ago. SSBC sells their front kit with the spindles, with a choice of either modified DJM or Bell Tech. Is this a direct bolt on caliper. Whether a brake part is quick-take-up or not, and yes, I understand that some brake calipers share part numbers and can't be reliably differentiated. The purpose of this upgrade is to improve the feel of the br the size of the piston in the MC matches the size of the piston in the brake cylinders and calipers. Yep, Im already playing I did the GMT800 front, Russell braided lines all around, GMT800 master up front (make sure it is the 34mm bore from a ~2002 Silverado). I do Looks like the dual piston caliper upgrade for 4WD works for possibly 4WD only. So far, what I have come up with, is that the GMT800 spindle is shorter than the spindle you are using. I didn't modify the proportioning valve as the instructions said that they "advise" you to and didn't state that it is "required". More members show up. 0, and 4:10 gears. This. I can see the want for good looking parts on your truck though. my fear is they may be a little aggressive for drilled slotted rotors. I fixed it by adding a hose clamp there. Also discovered the extra angular brace on the engine cradle is cracked, seemingly from a poor weld job by some UAW back in '97. A little more dust, but the grip and stopping is the best yet and the brake feel is good. Then he tells other folks who also don't comprehend the concept of low-drag calipers and high-volume (stepped) master cylinder bores, and they make the SAME MISTAKE. Your $300 firm feel master appears to be an overpriced rebranded GMT800 master cylinder. First thing Make sure all the little things are set up properly. That’s comparing a GMT800 K2500 to a GMT400 K3500 DRW. Articles; Reviews; News; Buyers Guides; Shop Work Next is a kit to convert to the GMT800 3/4 ton spindles and brakes. With good pads and new fluid I'd say braking performance is competitive with modern trucks with the same tow rating Traction: The 2008 Sprinter 2500 170 - camper van. Your best bet would be to go to the auto salvage yard and buy a pair of steering knuckles complete with hubs, brake rotors, calipers, ABS sensors, etc. I read about the gmt800 master, bought one for a 2001 c1500 Forums. Before we talk about combination valves, lets talk about the perfect brakes. The Hydroboost came from a 2005 z71 Suburban (GMT800). The most expensive part was the rear axle spacers to adapt the GMT800 disc brake backing plates. true PCM control (2 wire plug) only came about on the GMT800 platform at least for the US market. 575" bore AFAIK) b/c it's not relevant to the GMT800 brakes. Brake pedal is really soft after changing fluid and replacing front pads and rebuilding the rear drums. Reactions I recently did a rear disc conversion on my gmt400 x cab. Not bad for 15" rotors and 6 I am doing a frame swap on my '92 ExtCab Stepside K1500. 15" drw is 3. The Greenstuff pads are the best I've tried. The dead spot from the GMT400 master is much improved, but I still think the brakes could feel better. I was looking at at 2006 Crew Cab GMT800 Sierra with the 4. $80 as pictured. Can I adjust the drums by backing up and That's the plan, I think the tapper of the ball joint on the GMT800 spindle has to be changed. Maybe if I wanted to deal with bleeding the brakes again I'll go ahead and do that. I'm looking at switching to the JB7 calipers (pn: 18-4123) and the JB7 master cylinder. Thread starter romanos93; (1. SSBC is also the only aftermarket brake company that actually makes a rear disc kit of their own design, with the full R The GMT800 knuckles are reamed out to accept GMT400 ball joints and larger ES409RT outer tie rods, correct? Why can't GMT800 ball joints be used, clearance issues? Also, it seems GMT400 outer tie rod can be re-used in GMT800 knuckle without reaming if one doesn't want to upgrade to beefier tie rod? But seriously, I believe that the 7° is the upper taper and 10° is the lower ball joint taper and is done because the diameters of the shafts of the new parts are larger. The only difference How to swap out the squishy brake pedal for a firm brake pedal. Top. If you search the part numbers, you can get the calipers for 400 each and 70 bucks each for the rotors. I have a 14 bolt 9. So in addition to reaming upper balljoint hole, I reamed the GMT800's tie rod hole to fit the ES409R tie rod. You'll need the Ford/3 prong attachment part # 1107 for the 2002 Silverado master The above (plus GMT800 master cylinder) will get you Astro/GMT800 brakes on a 2WD. This also results in less clamping force at the brakes. Brake Upgrade. I did upgrade to the 2008 tahoe calipers and rotors. 15" and pads from a K2500 8 lug (8600lbs) Had to grind the front outer pads just like Nitro Junkie posted on one of the pervious pages. 2001 Suburban LT 2WD, 5. Right now your brake system upgrade as a whole is incomplete. Electric brakes. Seeing how the iron block 5. Ok so heres my attempt at a how-to on swapping from a 10 bolt rear end to a 14 bolt rear end. Otherwise, it has been a great truck. The hardware on the newer 3/4-1 ton dual piston is massive, the pads are huge. on the two wheel drive GMT400's they have a rotor with a packable bearing. There was no mention in any thread I read about changing the booster during the upgrade. 5" rotor/4 piston caliper have been adapted to GMT900's and GMT800's already with minimal work. The diameter conveniently splits the gmt800 to gmt900 brake swap. Looks like a big improvement over the stock setup. The GMPP brakes that utilize a 16" Brembo rotor and 6 piston caliper would be nice to see on a GMT400. 285" i don't think much gain if any came from the drw pads over srw but they are a bit thicker and designed different. -NBS 1500 series master cylinder (buy the corresponding master cylinder for your truck, 1/2 ton=1/2ton, 3/4ton= 3/4ton)-AGS BLF 26C brake line adapter (I got mine at autozone)-DOT 3 brake fluid The T1XX factory option "big" brakes w/13. On my 1500 I have the 8600# GVW front calipers, Hawk ceramic pads, El cheapo parts store rotors, and stock 14 bolt rear end shoes/drums What trucks the various brake codes came on. (7200lbs). IT'S MAGIC! I DISCOVERED A MAGIC UPGRADE!. A93obs; Sep If you swap to GMT800 brakes, you'd better take everything so you still have a "matched set" of components--including the rear brakes. Never tried it and haven’t owned a 4wd OBS or The NBS master cylinder upgrade is a good one because it is a non-stepped master cylinder and doesn't have all the QTU bits. i'm new to the K3500 platform and trying to research brake upgrades, but I'm not finding much out there. No need to mess with front calipers at all. An 800 master on 400 brakes in some cases Cheap GMT400 brake upgrade (mostly for Suburbans) Project Cars; Features. Anything else and you will have to move spring perches, shock mounts, and find adaptions/conversions for the brakes and U joint/yoke. But I am also a little sour on my GMT400 right nowit's parked with brake problems. The difference between the setup's are, vacuum assist brakes use engine vacuum in a stored chamber to assist the vehicle in stopping, hydroboost uses hydraulic pressure from the power steering pump to the the hydro boost booster to assist in a bigger master should be used, disk brake calipers use a higher volume of fluid than a set of wheel cylinders, usually a stock master will work but the petal throw will be much further and you will tend to over work the front brakes, that is why most offroaders who go rear disk also swap to a early 90's 4 wheel disk c3500hd master that was designed with a bigger everyone should know that for gmt400s you can get a esky cluster for your truck so you have a 120 mile an hour cluster, is there an option like that for a 2000 Z71? Gmt400 brakes-master cylinder upgrade, residual valves, disc/drum MC differences. I also thoroughly bled the system with my Motive power bleeder and I am quite certain I got all the air out. but then again, I love good brakes and being able to stop when I need to . Does that mean whit a bit of determination a gmt800 suspension lift could fit? As cheap and versatile as the gmt400 platform is there's no reason you can't put a million miles on one, as long as the frame don't split. The Results: Wow! The pedal feels firmer than any truck ive ever driven. That's why you should change the combination valve if you upgrade your rear brakes. I got a set of knuckles and lower control arms from a 1999 Silverado 2500 and a complete rear axle from a 2002 Silverado 2500HD. Yes it will work but you will no longer have rear brakes. Once I lengthened the Gmt800 master on gmt400 hydrobooster. My 1500 came stock with the 14 bolt semi-float rear axle (6 lug) so I swapped in the bigger wheel cylinders, JB7 master cylinder and braided hose lines all around. Thread starter schiker; Start date Jul 28, 2016; 1; 2; 3; Next. Have a complete hydroboost with master and pedal from gmt800. I wouldn't mess with disc brake conversions unless you are swapping rear axles that come factory with disk brakes. Also, there were two different versions of this brake upgrade. Folks have a defective QTU master cylinder, they "upgrade" to a fully-functional non-QTU master from a newer vehicle, and the brakes improve. 1 and diesels had the 11. What brake cables do i need to finish the conversion? Forums. Forums. I also have a '00 K3500 and I've pondered on swapping on it. e. I had to drill out the ring I welded on. I Looking to upgrade my brakes. That being said if have rear drums they require a constant 10psi the obs master cylinder has a provision for this. Thanks to AZ Pro Performance, you can now have the best of both worlds: affordable disc brakes and highly regarded aesthetic upgrades, all in one kit! For this project, we turned to our good friend Josh Freeman of the best solid axle conversion for your chevrolet or gmc full size 1988-1999 gmt400 obs ; 1999-2006 gmt800 nbs; 2007-2014 gmt900 nnbs; dodge ram front axle; shop all parts; apparel; when this spacer kit is installed, you can t’s been a minute or few since we last visited Western Chassis’ OBS suspension and brake offerings (Dec. The new MC is 1 ¾ shorter, I wanted to use the same brake lines. 15 calipers from the 8 lug (8600lbs) calipers. I run 35in tires on my 2 door. ’20 issue, to be exact!), so we figured it was past due time to take a closer look at their sister company Performance Online’s (POL) If you don't want to deal with moving anything to fit the giant TruCool 40K, the TruCool M7B is a decent upgrade over the factory AUX cooler and will fit in the same spot with just some minor trimming of the factory brackets and a couple fitting adapters. I up graded the front caliper's to 3. The braking feels different, but I also swapped in a 14 bolt semi floating rear axle with bigger drums at the same time. I can say with a fair degree of certainty that the Launch Tech Creader Professional Elite (office in Ontario, CA) will NOT do the ABS brake bleed for a Tahoe prior to 2007. Brake upgrade help. Interesting that we have stickies at the top of this forum recommending both the 88-98 GMT400 Conversion Kits; 01-10 GMT800 Conversion Kits; Partial Solid Axle Swap Bracket kit; 1973-1991 2wd-4wd conversion; exclusive top-quality, DOT-approved extended braided stainless steel brake line kits! They have a tough teflon tube at the core, but the next layer is a Kevlar braid, then an extra protection layer, the stainless Not something I skimped out on when it comes to brakes. The truck originally came with a heavy duty rad, V02 option (34 in core) with trans and oil coolers built in. Brakes are fantastic! A Motive Power bleeder works well for getting all the air out. massive leaks at the wheel cylinders, or the rear shoes aren't adjusted properly. I use Powerstop z36 brake pads. 5x5), but that can be redrilled. The JB3, JB5, and (I think) JB6 (well, xx3, xx5, and xx6) GMT400 better braking. I just bought my first truck, 1998 GMC c1500. I want to do this the best way from the start, rather than just do 2500 rotors and find that the offset and braking power Mostly, I need something that can tow better. What brake code a part goes with, i. JB3, JD5, etc. At the time, I was thinking about going the lazy/expensive way with a dual piston caliper upgrade on stock 4x4 knuckles. Hi I am new to the forum. Just like engines, it's all about the details, and There is NO reason to add the GMT800 master cylinder to your vehicle unless you also add GMT800 calipers (wheel cylinders) front and rear, as well. I did this upgrade on my gmt800 and noticed a difference all around, bc i think the factory put bare Forums. - the pedal is worthless; the GMT400 quadrant is very different from the GMT800 pedal quadrant, and simply swapping pedals is not possibly without a LOT of drastic modification. Getting the front wide enough just using The cost is the same as a regular brake job on a truck this old, and it significantly increased brake performance. It fits tight. 3" while the gmt400 1500 master bore is 1. 5" range where the GMT800 is around 65" so the rack shouldnt be too wide. I was think about seeing if the 05+ 1/2 front disks would swap over. Joined Apr 11, 2013 Messages 506 Reaction score 213 Location Western WA from Eastern WA, aka the wet side from The vacuum booster is factory GMT400 and the cylinder is GMT800. im in the middle of trying to get parts to upgrade the master cylinder. Messages 3,109 Reaction score 2,043 My drivers side leaked a good bit of brake fluid out while I worked on the getting the brake hose holder off the old hose. For you can have good brakes on a GMT400 vehicle. 5" full floater and the 8. 7 vortec. First heres the parts list 14 Bolt 6 lug-$300-$600 1350 The pedal feels way better. I don't know what if anything is different at the rear. The previous owner replaced it "My vehicle is a 97 K1500. I'm hopeful that with a few upgrades like regearing, a bit of brake work (NBS knuckles, new MC, new brake lines, and rear disc) throwing on helper air bags, some performance parts and tuning it'll be able to tow just as well as confidently as my OK, not sure how I missed this one. I This company has a more affordable option for a rear disk brake upgrade for these trucks compared to other well known companies. 5" tone 11" brakes for now. the srw 1 ton piston is 3. I have front calipers with the 2. Well, as some of you know, some ebay sellers started selling mirrors that apparently fit. I am using this as a template for anyone who wants to do a gmt400 suspension conversion to a gmt800. By themselves, the 11" drums will dangerously destabilize your rig. It is definitely superior in stopping power. If not, maybe I'll just roll the dice, Amazon will return anything. "Heavy Duty" brakes on a 1500 would be JB6. You will need a HB power steering pump with extra ports to plumb in. I already have eliminated the abs and added a disc/disc willwood proportioning valve. Latest posts. This seems The GMT800 master cylinder firms up the pedal because it has more piston area than a GMT400 master cylinder. My truck is a 2000 k2500 8600gvw. That said, I have the GMT800 on my truck, and my rear brakes work just fine. Mar 10, 2019 I have an 06 and want to do the 07+ front brake The Big 3 is a really good addition to the GMT400’s electrical system, and a definite must-have for anyone running high-draw electrical accessories such as amplifiers, winches, aux lights, etc. Located in brazos Forums. If you want really improved front braking, just bite the bullet and do the GMT-800 conversion and quit piddling around with a potentially fatal, dangerous mish-mash of In my experience, I found that the 1500 (5 lug) and the 2500LD (6 lug) are identical far as the pads, calipers and size of the rotor. But my goal was to do it to get another 2" drop with correct suspension geometry and ability to swap to bigger better brakes. The taper didn't fit the GMT800 knuckle as is. Some doofus removes a correct-but-failed master cylinder, installs an incorrect but working master, and thinks he's accomplished something. Brakeshere is the one place the GMT400 CAN NOT (in stock form) touch the GMT800! GMT400 brakes (non hydroboost) suck, period, GM engineers will even admit that! In the end, it's your money, do with it what you please. I think the only part that "might" be used off one, is the rarer Trailblazer SS 14 bolt SF axle, and Im positive the width, and mountings are completely off from a GMT400 chassis. S. Replace your pads with good pads. Again around $2,000. If your rears are locking up, you've got other issues. They did have non HD 8 lug 2500's, they came with the 14b semi float, the 2500 suburbans and trucks with the 6. Most of what I found is half ton upgrades from vacuum boost Interior, I prefer the GMT400 looks, but my GMT800 Vortec Max is very comfortable to travel in, but cheap looking. New to GMT800. While an improvement, is it a substantial improvement. Reactions: The front brakes are tied together with a T, and the rear brakes have a wilwood adjustable proportioning valve. better brakes, front and rear end, bolt in a 4L80e trans (better than the 4l60e). The stud on the GMT400 Hydroboost pedal has a stud with a shoulder at the base and is larger than the stud on the GMT400 Vacuum booster. glad this thread came up. I am impressed! You even got the computers working for Fuel Econ and such. Finally! After years or people asking, and numerous people installing GMT800 mirrors that didn't correctly fit GMT400 trucks. People have been putting Z06 brakes on GMT800 for a while, I think some have done CTS-V but I can't remember for sure. 6 lug trucks used a 2. 1, my gmt400 will become our plow truck. Jun 22, 2016 #64 NBS/Astro knuckle brake upgrade. - the HB unit actuator rod (the rod with the eyelet that connects to the pedal) is too short. How much of a pain was that? I wonder if the 06 gages were more reliable than other GMT800s of that era. The only one I could get was by Dorman and as soon as I went to apply it with any bit of tension the one cable pulled through. I purchased the "PowerStop Z36 Truck & Tow" Front/Rear kit and installed them on my 04' Suburban Z71 4x4 5. Understanding the GMT400 Platform Brief History of the GMT400. That song tho haha. I had to buy parts anyways so I went with a set of 2010+ GMT900 Calipers, pads, rotors and brake hoses to upgrade to the 13" rotors instead of 12". Should I convert the stock axle to discs, or convert to the gmt 800 axle? My stock axle seems to be in ok shape. Junkyard Alternator Upgrade. If your brakes are perfect, best braking comes when all four wheels are very close to skidding, or even in a 5% skid. After much debate, research, etc, I determined that the bases must be correct I've seen where people will use the lift knuckles for a gmt800 2500hd with the gmt400 k1500 lift kit that way its easier to convert to 8lug up front and then you have 2500hd brakes instead of gmt800 1500 brakes, doubt its just a bolt up swap but I've seen a few of them so it shouldn't be to bad other than the cost of all that. I know $400 kit is more up my alley than the $1200+ option. Joined My 99 Tahoe had a 2 wire setup as did the 2001+ 0411 GMT400 based vans I've done tons of brake work on the truck (All new lines, wheel cylinders, calipers, GMT800 master cylinder, Brake Booster) but still never felt like I had really good brake performance. Good fluid flow when bleeding eliminates the possibility of an actual blockage in the hydraulic system. Reactions: HotWheelsBurban. These are the upgrade brakes you'll see on some of the big late model SUV's (and a few sport trucks I can't seem to find a thread with relatable information. For just easy, normal driving it was okay, but I didn't feel it ever had enough stopping power when I had a load in the bed, if a quick stop was needed, or Most of the parts are specific to that chassis, even its 6 lug wheels are oddball-sized. Thanks in advance. iccbwhrlvvukzdatpouqcbvzwfjampbeinwicqgavvnfpnailde