First hand experience with changing to the NBS master cylinder WOW! - Page 7 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Vintage Windmills · 03-17-2018, 02:08 PM

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.

Tom · 03-17-2018, 04:15 PM

Quote:

Originally Posted by Vintage Windmills

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?

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.

arrg · 03-17-2018, 05:14 PM

Quote:

Originally Posted by Vintage Windmills

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.

I did it on my 1988. It was a royal pain to bend the short lines. They didn't turn out very straight and I really had to tighten them down more than I should have to get them to stop leaking. I will likely replace them with some Nicopp line at some point because I don't like how they turned out.

hb32 · 01-20-2019, 12:53 AM

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.

speedygonzales · 01-20-2019, 09:32 AM

Do the automatic bleed process. Best 3 minutes time spent every time.

hb32 · 01-20-2019, 12:11 PM

Quote:

Originally Posted by speedygonzales

Do the automatic bleed process. Best 3 minutes time spent every time.

Spent an hour searching for the “ automatic bleed process “ and could not find it.

**hatzie** · 01-20-2019, 04:09 PM

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

62 mark · 01-14-2020, 05:27 PM

Digging up this old thread,hoping someone can help me with brake line orientation on a 99 master cylinder. I am putting the hydroboost unit from a 99 silverado in my 62, but I am unsure if the master is front port to front brake, rear to rear.

mountie · 01-14-2020, 07:15 PM

Quote:

Originally Posted by 62 mark

Digging up this old thread,hoping someone can help me with brake line orientation on a 99 master cylinder. I am putting the hydroboost unit from a 99 silverado in my 62, but I am unsure if the master is front port to front brake, rear to rear.

Your thought about "front-front / rear-rear" seems logical...
( But we are talking about GM)....

My suggestion is to just stop by a repair shop.... Good luck

**hatzie** · 01-14-2020, 07:45 PM

Quote:

Originally Posted by 62 mark

Digging up this old thread,hoping someone can help me with brake line orientation on a 99 master cylinder. I am putting the hydroboost unit from a 99 silverado in my 62, but I am unsure if the master is front port to front brake, rear to rear.

99 probably had four wheel disc brakes so the pistons are likely the same diameter.
The 99 abs metering module took care of biasing. Not sure how the old fashioned combination valve will react.

Jz2518 · 02-04-2021, 08:00 AM

Speedy. What booster did you use to mount the nbs mc in the older c10. The mc have a bigger hub that won't fit in the older master cylinder. I want the newer mc because I have all 4 rear brakes and the old mc is feels to soft. Thanks

03-17-2018, 02:08 PM	#1
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	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. __________________ 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

01-20-2019, 12:53 AM	#4
hb32 Registered User Join Date: Feb 2009 Location: Surrey B.C. Canada Posts: 255	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. __________________ Life is too short to drive a boring vehicle.

01-20-2019, 09:32 AM	#5
speedygonzales Registered User Join Date: Jan 2006 Location: Smithfield, VA Posts: 1,501	Waste of time Do the automatic bleed process. Best 3 minutes time spent every time. __________________ 99 Z71 (98 body style) Pride and joy

01-20-2019, 04:09 PM	#7
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,916	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 __________________ 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... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 01-20-2019 at 04:28 PM.

01-14-2020, 05:27 PM	#8
62 mark Registered User Join Date: Nov 2009 Location: Tampa Fl. Posts: 103	Re: First hand experience with changing to the NBS master cylinder WOW! Digging up this old thread,hoping someone can help me with brake line orientation on a 99 master cylinder. I am putting the hydroboost unit from a 99 silverado in my 62, but I am unsure if the master is front port to front brake, rear to rear.

02-04-2021, 08:00 AM	#11
Jz2518 Registered User Join Date: Jun 2018 Location: Austin Posts: 5	Re: First hand experience with changing to the NBS master cylinder WOW! Speedy. What booster did you use to mount the nbs mc in the older c10. The mc have a bigger hub that won't fit in the older master cylinder. I want the newer mc because I have all 4 rear brakes and the old mc is feels to soft. Thanks



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