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#151 |
Registered User
Join Date: May 2016
Location: south windsor, ct
Posts: 2
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Re: First hand experience with changing to the NBS master cylinder WOW!
Found this thread as I was swapping the rear discs on my 97 k1500. Then did the master cylinder, and figured I'd change to the right combination valve. Now I'm stuck, can someone help?
How can I plumb the new combination valve into the abs unit? The diagram shows what I have..the combination valve bolts and directly takes fluid in and the abs unit has three valves out...two valves for the front, one rear. The correct disc/disc combination valve has two ports in three out. The old is two in, two out. I've never liked the abs on this truck..should I discard? What's the proper way to disable the Abs? ![]() ![]() |
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#152 |
Registered User
Join Date: Jan 2006
Location: Smithfield, VA
Posts: 1,501
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Re: First hand experience with changing to the NBS master cylinder WOW!
This issue should have it's own thread. People are going to come here looking for changing the master cylinder information.
Repost it as a new post. |
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#153 | |
Moderator
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Location: Wentworth, NH
Posts: 4,951
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Re: First hand experience with changing to the NBS master cylinder WOW!
Quote:
![]() Brake Fluid I can buy locally in metal cans... Pentosin DOT4 I can get both Super DOT4 and low viscosity DOT4 LV locally at Bond Auto Parts. DOT4 LV is a 1-2 day turnaround to order it in Super DOT4 is on the shelf. I believe Pentosin is available on-the-shelf at AutoZone for you folks in the city. ATE DOT4 Type 200 and SL-6 are not as common to find on the shelf but the local NAPA franchise can and will get me the low viscosity SL-6, that I run in my LS4 Impala and VW, in 2-3 days. I have no problem stocking several metal cans because it keeps. They have several local folks with MGB and other semi-antique British cars that use this stuff too.
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1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. Last edited by hatzie; 05-26-2016 at 01:32 PM. |
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#154 |
Registered User
Join Date: Jun 2016
Location: Augusta < GA
Posts: 2
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Re: First hand experience with changing to the NBS master cylinder WOW!
I have a 96 C1500 Burb. Will the switch out using the MC 2002 Siverado with rear disc brakes be compatible with my truck with rear drum brakes?
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#155 |
Registered User
Join Date: Jan 2006
Location: Smithfield, VA
Posts: 1,501
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Re: First hand experience with changing to the NBS master cylinder WOW!
If it looks like this:
![]() Then yes Incidentally mine is shot already |
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#156 | |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,194
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Re: First hand experience with changing to the NBS master cylinder WOW!
Quote:
If you have disc/drum brakes then you need a disc/drum master cylinder. I wouldn't think a disc/disc master would have the right design considerations for your setup. K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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#157 |
Registered User
Join Date: Jun 2016
Location: Augusta < GA
Posts: 2
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Re: First hand experience with changing to the NBS master cylinder WOW!
Speedygonzales,
Is your NBS MS already shot? A 1999 would have drum brakes as well. |
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#158 |
Registered User
Join Date: Jan 2006
Location: Smithfield, VA
Posts: 1,501
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Re: First hand experience with changing to the NBS master cylinder WOW!
fluid leaking past the seals. It's been suggested the lines have to be reversed, will try that this weekend with a replacement unit.
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#159 |
blood type; Retumbo
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,269
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Re: First hand experience with changing to the NBS master cylinder WOW!
I'll be watching for your update. I don't have a newer truck in the shop otherwise I'd follow the lines and see which is which
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Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card |
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#160 |
Registered User
Join Date: Jan 2006
Location: Smithfield, VA
Posts: 1,501
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Re: First hand experience with changing to the NBS master cylinder WOW!
I looked for any published indication that the ports were reversed on the GMT800 MC. Could not find any.
The reservoirs both old and new seem to have bigger portions on the front. Even if they don't it makes no difference. I did not reverse the lines. Still crappy brakes compared to everything else on the road but better then it was when it had the original MC. |
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#161 |
Registered User
Join Date: Jun 2016
Location: E TN
Posts: 1
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Re: First hand experience with changing to the NBS master cylinder WOW!
I've read thru this thread as a fix for my Chevy truck. I was a GM tech from the 70's up until these trucks were new. They always had the soft pedal from day.
The original MC had a step bore so it did make a difference how the lines were attached, plus since you had frt. disc only the reservoir for the frt. is larger. the reason for this is that disc brakes are self adjusting in the the piston moves out as the pad wears and the space is taken up by fluid. On a straight bore MC the only difference in ports would be if you had a MC from a frt. disc vehicle. The NBS MC is for a disc/disc vehicle so it doesn't matter how you connect the lines. |
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#162 |
Registered User
Join Date: Apr 2009
Location: Texas
Posts: 24
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Another Co-Sign to this upgrade
I did the NBS upgrade this afternoon after the drum brake wheel cylinders failed and I had to replace those and bleed the system anyway.
WOW! Night and Day. If you're on the fence, you're wasting your time. This is one of the easiest and quickest upgrades you can do. I got lucky and I got the MC from a friend who was doing a hydroboost conversion on his 2001 NBS, so it didn't cost me a thing. I know that there is a piece of mind that comes with buying one new but I never hear about stock MCs failing that often so I decided to err on the side of saving money and we with the used unit. The pedal feel and response is significantly better than the original equipment. I feel it now brakes just as good if not better than the wife's 2015 sedan. |
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#163 |
Registered User
Join Date: Apr 2009
Location: Texas
Posts: 24
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Another Co-Sign to this upgrade
I did the NBS upgrade this afternoon after the drum brake wheel cylinders failed and I had to replace those and bleed the system anyway.
WOW! Night and Day. If you're on the fence, you're wasting your time. This is one of the easiest and quickest upgrades you can do. I got lucky and I got the MC from a friend who was doing a hydroboost conversion on his 2001 NBS, so it didn't cost me a thing. I know that there is a piece of mind that comes with buying one new but I never hear about stock MCs failing that often so I decided to err on the side of saving money and we with the used unit. The pedal feel and response is significantly better than the original equipment. I feel it now brakes just as good if not better than the wife's 2015 sedan. |
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#164 |
Registered User
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Location: Bradenton, Fla.
Posts: 1,100
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Re: First hand experience with changing to the NBS master cylinder WOW!
Square One is a perfect example why us truck owners are here....
To make our cool trucks better! I did the MC upgrade 2 years ago, because I learned it here.
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'70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018) |
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#165 |
Registered User
Join Date: Jan 2006
Location: Smithfield, VA
Posts: 1,501
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Stop wasting your time changing pieces to get better brakes!!!
All of this is a waste of time.
Trust me I started this thread. In addition to changing the master cylinder I also changed my front calipers to 2 piston and rotors to slotted type. None of this works as well as the way the brakes should be from the factory. But I'll tell you what does! I just came in from doing it. It's called the "automated bleed procedure". I was poking around a few threads mentioning that nothing works until people did this. Some even said most GM's are this way. Without it you're wasting your time. But what the hell does bleeding the ABS have to do with the normal brake operation. I"m sure I'm not the only one that said that and did normal brake bleeding procedure. I don't know and was skeptical until I did it. See my new post for a little more information. |
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#166 |
Registered User
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Location: Bradenton, Fla.
Posts: 1,100
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Re: First hand experience with changing to the NBS master cylinder WOW!
I'll gladly check that out.
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'70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018) |
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#167 |
Vintage 4x4s
Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
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Re: First hand experience with changing to the NBS master cylinder WOW!
Getting ready to do this and a couple things are bugging me.
1) Everyone buys a NBS MC with application for a truck with rear disc brakes. All GMT400's had rear drums. Does it not matter? 2) Anyone done this on a truck with rear ABS only (94 down)? There is hardly any length of line between the ABS setup and the MC on the older trucks. The 95 up have the ABS stuff a ways from the MC on the fender so that makes things easier. All pics I've seen are 95 up. Thanks in advance.
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67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ![]() 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6 |
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#168 |
driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,720
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Re: First hand experience with changing to the NBS master cylinder WOW!
That's been answered many times in this thread. The vast majority of people doing this are not doing rear disk brake swaps along with it. Its works great.
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-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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#169 | |
Registered User
Join Date: Feb 2016
Location: Omaha, NE
Posts: 38
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Re: First hand experience with changing to the NBS master cylinder WOW!
Quote:
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1988 Chevrolet C1500 RCSB |
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#170 |
Registered User
Join Date: Feb 2009
Location: Surrey B.C. Canada
Posts: 255
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Re: First hand experience with changing to the NBS master cylinder WOW!
Accomplished this today as well and do not notice a huge difference. Lots of dark fluid on the bleed and reservoir on the old mc was really dirty. Going to wait a week and try another bleed. Thanks to the op for the part numbers and tutorial.
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Life is too short to drive a boring vehicle. |
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#171 |
Registered User
Join Date: Jan 2006
Location: Smithfield, VA
Posts: 1,501
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Waste of time
Do the automatic bleed process. Best 3 minutes time spent every time.
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#172 |
Registered User
Join Date: Feb 2009
Location: Surrey B.C. Canada
Posts: 255
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Re: Waste of time
Spent an hour searching for the “ automatic bleed process “ and could not find it.
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Life is too short to drive a boring vehicle. |
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#173 | |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,951
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Re: Waste of time
Quote:
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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#174 | |
Registered User
Join Date: Feb 2009
Location: Surrey B.C. Canada
Posts: 255
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Re: Waste of time
Quote:
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Life is too short to drive a boring vehicle. |
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#175 |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,951
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Re: First hand experience with changing to the NBS master cylinder WOW!
If you want to do an auto bleed that's the way it's done.
A Tech2 clone is $259. I own one. They work. GM VXDiag is around $110 and it comes with Tech2Win and TIS2000. You need a Windows laptop to go this route and those aren't free. The NAO 33.004 Tech2 BIN file is available on the Tech2 Wiki if it's not shipped with the VXDiag tool. The Snap On Solus tools can be had used for just under a grand. AutoEnginuity can do it as well but you need a laptop and the cost is right around $500. There are probably a handful of other tools in the $500 on up range that can do it on some but not all ABS systems. The nice thing about the T800 master cylinder is the round three tab cap that takes one of the leak free pressure bleeder adapters... Motive 1107 ![]() SPX Kent Moore J-35589-A ![]()
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1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. Last edited by hatzie; 01-20-2019 at 04:28 PM. |
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1988-1999, brakes, mushy, obs |
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