Brake problems!! Need Advise.. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bcj67chevy · 04-14-2010, 07:40 AM

hey guys,
Just got a 1972 chevy w/ power brakes and front disc. Truck doesn't stop well at all. The pedal is rock hard from the beginning and doesn't seem to go down very far. Would this be the booster and or master cylinder, or could it just be air in the brake lines? Had the front wheels off and the brakes look good.
Hopefully one of you guys ran into this before.

Thanks
Bryan

**Hart_Rod** · 04-14-2010, 05:10 PM

Sounds like the booster. Pull the vacuum source off the booster and see if anything changes. If not, it's probably the booster.

AzDon · 04-14-2010, 09:11 PM

You can usually hear the vacuum leak of a bad booster and the way to confirm is to pull the vacuum line off the booster and plug it. Vacuum noise should stop and engine should run better!
Your problem suggests either a bad booster or an improper pedal ratio.... The pedal ratio thing could only happen if the stock pieces were changed (not likely) It IS also possible that the wrong master for the application has been installed

bcj67chevy · 04-15-2010, 07:44 AM

Thanks for the help guys. the pcv vac hose was off, and the booster is hooked to the same port off the engine, i think that will fix it.
Thanks

04-14-2010, 07:40 AM	#1
bcj67chevy 402 BIG BLOCK Join Date: Mar 2006 Location: McClelland IA Posts: 286	Brake problems!! Need Advise.. hey guys, Just got a 1972 chevy w/ power brakes and front disc. Truck doesn't stop well at all. The pedal is rock hard from the beginning and doesn't seem to go down very far. Would this be the booster and or master cylinder, or could it just be air in the brake lines? Had the front wheels off and the brakes look good. Hopefully one of you guys ran into this before. Thanks Bryan __________________ 1967 C10 swb 1970 GMC Jimmy 4x4 2005 Chevy tahoe Z71 2001 Chevy impala

04-14-2010, 05:10 PM	#2
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,863	Re: Brake problems!! Need Advise.. Sounds like the booster. Pull the vacuum source off the booster and see if anything changes. If not, it's probably the booster. __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3

04-14-2010, 09:11 PM	#3
AzDon Registered User Join Date: Oct 2008 Location: Lake Havasu,AZ Posts: 202	Re: Brake problems!! Need Advise.. You can usually hear the vacuum leak of a bad booster and the way to confirm is to pull the vacuum line off the booster and plug it. Vacuum noise should stop and engine should run better! Your problem suggests either a bad booster or an improper pedal ratio.... The pedal ratio thing could only happen if the stock pieces were changed (not likely) It IS also possible that the wrong master for the application has been installed

04-15-2010, 07:44 AM	#4
bcj67chevy 402 BIG BLOCK Join Date: Mar 2006 Location: McClelland IA Posts: 286	Re: Brake problems!! Need Advise.. Thanks for the help guys. the pcv vac hose was off, and the booster is hooked to the same port off the engine, i think that will fix it. Thanks __________________ 1967 C10 swb 1970 GMC Jimmy 4x4 2005 Chevy tahoe Z71 2001 Chevy impala



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