Disc Brake Conversion - Which MC? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bluec10 · 02-13-2008, 10:47 AM

I'm converting the front end of my '69 GMC to disc brakes. I'm installing the front crossmember and spindles from an '84 GMC - it fits perfectly with only 2 new holes to drill.

Which master cylinder should I use with this setup? I want to use one that fits with the '69 look, not one of the plastic ones from the newer trucks.

tcb-1 · 02-13-2008, 10:58 AM

get a 71-72 truck disc/drum master cylinder and a disc/drum proportioning valve. if you want power, get a 71-72 truck booster and your gold.

EyeH8the24 · 02-13-2008, 11:08 AM

^^ what he said....just finished this on my 69 to had to rearrange the brake lines as i kept the 87 brake lines and prop valve..but workd out very well

02-13-2008, 10:47 AM	#1
bluec10 Registered User Join Date: Apr 2002 Location: Manitoba, Canada Posts: 663	Disc Brake Conversion - Which MC? I'm converting the front end of my '69 GMC to disc brakes. I'm installing the front crossmember and spindles from an '84 GMC - it fits perfectly with only 2 new holes to drill. Which master cylinder should I use with this setup? I want to use one that fits with the '69 look, not one of the plastic ones from the newer trucks. __________________ 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.

02-13-2008, 10:58 AM	#2
tcb-1 Nothing to see here..... Join Date: Jun 2007 Location: Shawnee, KS Posts: 4,625	Re: Disc Brake Conversion - Which MC? get a 71-72 truck disc/drum master cylinder and a disc/drum proportioning valve. if you want power, get a 71-72 truck booster and your gold. __________________ Doug THANK YOU to our American Soldiers & Veterans - POW MIA "You will NEVER be forgotten". The democracy will cease to exist when you take away from those who are willing to work and give to those who would not. Thomas Jefferson

02-13-2008, 11:08 AM	#3
EyeH8the24 Registered User Join Date: Dec 2004 Location: beulah,alabama Posts: 1,075	Re: Disc Brake Conversion - Which MC? ^^ what he said....just finished this on my 69 to had to rearrange the brake lines as i kept the 87 brake lines and prop valve..but workd out very well



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