Brake Booster Troubleshooting - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bluec10 · 03-21-2010, 10:23 PM

I put power brakes in my 69 GMC last summer. When the booster is hooked up there is a noticeable power issue.

I know it could be a vacuum leak in the booster. I was also wondering if the 250 L6 engine has enough vacuum to properly operate the booster. Would the booster size/type vary according to engine size?

msgross · 03-21-2010, 10:38 PM

what port did you use?

bluec10 · 03-22-2010, 09:47 AM

I used the big port on top of the exhaust manifold.

03-21-2010, 10:23 PM	#1
bluec10 Registered User Join Date: Apr 2002 Location: Manitoba, Canada Posts: 663	Brake Booster Troubleshooting I put power brakes in my 69 GMC last summer. When the booster is hooked up there is a noticeable power issue. I know it could be a vacuum leak in the booster. I was also wondering if the 250 L6 engine has enough vacuum to properly operate the booster. Would the booster size/type vary according to engine size? __________________ 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.

03-21-2010, 10:38 PM	#2
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: Brake Booster Troubleshooting what port did you use? __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

03-22-2010, 09:47 AM	#3
bluec10 Registered User Join Date: Apr 2002 Location: Manitoba, Canada Posts: 663	Re: Brake Booster Troubleshooting I used the big port on top of the exhaust manifold. __________________ 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.



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