Rear Disc Brake Question - Master Cylinder - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bluec10 · 04-14-2005, 02:34 PM

My local wrecker has a Seville "in stock" and I think I could get the rear calipers for a good price. I recently read a thread (can't remember which one) where the thread starter was happy with the brackets that he bought from this guy:
http://stores.ebay.com/Home-Improvem...Q3amesstQQtZkm.

I want my truck to look stock, but I really like the idea of front and rear discs. What master cylinder/prop valve will work with Disc/Disc setups?

Is the master cylinder the issue, or just the prop valve? It would seem to be easier to just find a disc/disc prop valve.

BobbyK · 04-19-2005, 02:26 AM

Here's a post a while back with some good info.

I replied to that post with part numbers of the parts I used for my rear disc swap.

http://67-72chevytrucks.com/vboard/s....php3?t=149149

bluec10 · 04-19-2005, 10:13 AM

Thanks for the link.

**raggedjim** · 04-19-2005, 10:20 AM

CPP sells a disc/disc combination valve for these trucks.

As far as the master cylinder, the disc need a bigger resevoir for fluid because as they wear the fluid level will drop in the master cylinder. Drums have a mechanical system to adjust for wear, so the master cylinders on drum brake trucks are smaller. I bought the master cylinder for a 68-74 corvette and the CPP proportioning valve, but have yet to put it all together.

You can use the stock master cylinder with the proportion valve from CPP but be sure to monitor your fluid.

This has been done by alot of people many different ways and I am not a expert on this by any means. Just be sure to keep safety in mind...

Good luck, Rg

04-14-2005, 02:34 PM	#1
bluec10 Registered User Join Date: Apr 2002 Location: Manitoba, Canada Posts: 663	Rear Disc Brake Question - Master Cylinder My local wrecker has a Seville "in stock" and I think I could get the rear calipers for a good price. I recently read a thread (can't remember which one) where the thread starter was happy with the brackets that he bought from this guy: http://stores.ebay.com/Home-Improvem...Q3amesstQQtZkm. I want my truck to look stock, but I really like the idea of front and rear discs. What master cylinder/prop valve will work with Disc/Disc setups? Is the master cylinder the issue, or just the prop valve? It would seem to be easier to just find a disc/disc prop valve. __________________ Present: 2015 Tacoma. Yeah, not a GM, but I love it. 1969 GMC 32,000 - fix, drive, relax, fix... 2019 BMW R1250 GSA - Yahoooooooo 1979 Honda GL 1000 - retro touring at its best. Past: '05 Sierra 4x4 - Had 270,000 KM and running well when it was written-off by a stop sign runner. '94 F-150 from the "F word" company. I'll admit it...good truck. Sold what was left of it for $800 to a guy who came to pick it up at 11:00 PM with cash in hand. Hmm. '79 Sierra Grande (Black) organ donor - perfect rebuildable 4-bolt 350 and a good TH350. '76 Sierra Grande (Orange) - hate isn't too strong a word. Kid who bought it turned it into a hot rod. '68 C-10 R.I.P. - Dad's old truck...too far gone to resurrect. '59 C-50 - with hoist. Truck is gone, wife isn't. Nuff said.

04-19-2005, 02:26 AM	#2
BobbyK Registered User Join Date: May 2000 Location: Petrolia,Ontario,Canada but working in Port Huron,Mi. Posts: 1,772	Here's a post a while back with some good info. I replied to that post with part numbers of the parts I used for my rear disc swap. http://67-72chevytrucks.com/vboard/s....php3?t=149149 __________________ 71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension. Petrolia,Ontario,Canada but working in Port Huron,MI. See ALL my Blazer pic's HERE Last edited by BobbyK; 04-19-2005 at 02:27 AM.

04-19-2005, 10:13 AM	#3
bluec10 Registered User Join Date: Apr 2002 Location: Manitoba, Canada Posts: 663	Thanks for the link. __________________ Present: 2015 Tacoma. Yeah, not a GM, but I love it. 1969 GMC 32,000 - fix, drive, relax, fix... 2019 BMW R1250 GSA - Yahoooooooo 1979 Honda GL 1000 - retro touring at its best. Past: '05 Sierra 4x4 - Had 270,000 KM and running well when it was written-off by a stop sign runner. '94 F-150 from the "F word" company. I'll admit it...good truck. Sold what was left of it for $800 to a guy who came to pick it up at 11:00 PM with cash in hand. Hmm. '79 Sierra Grande (Black) organ donor - perfect rebuildable 4-bolt 350 and a good TH350. '76 Sierra Grande (Orange) - hate isn't too strong a word. Kid who bought it turned it into a hot rod. '68 C-10 R.I.P. - Dad's old truck...too far gone to resurrect. '59 C-50 - with hoist. Truck is gone, wife isn't. Nuff said.

04-19-2005, 10:20 AM	#4
raggedjim Senior Member Join Date: Jun 2002 Location: Murray, Kentucky Posts: 3,650	CPP sells a disc/disc combination valve for these trucks. As far as the master cylinder, the disc need a bigger resevoir for fluid because as they wear the fluid level will drop in the master cylinder. Drums have a mechanical system to adjust for wear, so the master cylinders on drum brake trucks are smaller. I bought the master cylinder for a 68-74 corvette and the CPP proportioning valve, but have yet to put it all together. You can use the stock master cylinder with the proportion valve from CPP but be sure to monitor your fluid. This has been done by alot of people many different ways and I am not a expert on this by any means. Just be sure to keep safety in mind... Good luck, Rg __________________ Roger '68 Short step - https://67-72chevytrucks.com/vboard/...d.php?t=849675 '69 ('70?) 2wd Blazer - https://67-72chevytrucks.com/vboard/...d.php?t=856475 '70 GMC Jimmy 2wd '73 Firebird - https://67-72chevytrucks.com/vboard/...d.php?t=853203 Ideas - https://67-72chevytrucks.com/vboard/...d.php?t=851743

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