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01-14-2026, 04:25 PM
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#1 |
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Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,838
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Brakes
I believe my brake booster is bad as it wont release the brakes when I stab it hard when some idiot is on a suicide run.
What would cause this. Or is my diagnosis wrong and its the master cylinder? |
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01-14-2026, 06:27 PM
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#2 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,490
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Re: Brakes
I would suspect front brake hose(s).
They can collapse internally and trap pressure. Or a corroded caliper/piston. K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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01-16-2026, 11:28 AM
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#3 |
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Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,838
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Re: Brakes
I have no brake drag.
The issue only happens when the brakes are hit hard. |
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01-18-2026, 02:29 PM
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#4 |
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At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,447
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Re: Brakes
Open a bleeder when it does it next.
If there is pressure your brake hose failed.
__________________
" That didnt make it any newer " " Dont antique the equipment " |
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01-19-2026, 02:12 AM
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#5 |
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Registered User
Join Date: Mar 2022
Location: Surrey BC
Posts: 1,397
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Re: Brakes
pop the vacuum line off booster next time, if that release break pressure there is an issue with booster
When they do lock on how do you release them? |
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01-19-2026, 11:46 AM
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#6 | |
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Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,838
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Re: Brakes
Quote:
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01-19-2026, 11:47 AM
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#7 | |
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Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,838
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Re: Brakes
Quote:
I pull the pedal up with my toes. |
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01-19-2026, 11:55 AM
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#8 |
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Registered User
Join Date: Mar 2022
Location: Surrey BC
Posts: 1,397
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Re: Brakes
sounds like the problem is most likely mechanical in the pedal, pushrod, return spring.
remove the two nuts holding master to booster, pull master away from booster and play with the pedal. A c10 style pedal box, may need the pivot shaft removed, cleaned and lubed. That was sometimes an issue even when these trucks were newish |
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01-24-2026, 12:41 PM
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#9 |
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Registered User
Join Date: Nov 2008
Location: kannapolis, nc
Posts: 571
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Re: Brakes
bad booster usually makes for a hard pedal
__________________
2000 c3500 utility bed 7.4l 5sp manual old body style. Cab and chassis 1964 GMC K10 383cu in/sm465/twin stick np205 1965 Chevy C60 1990 Chevy Bus 8.2l fuel pincher 8800 miles 1993 Ford F350 crewcab 7.3idi nonturbo ZF5 Transmission Running on WMO |
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01-24-2026, 05:27 PM
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#10 | |
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Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 2,108
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Re: Brakes
Quote:
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01-27-2026, 02:36 AM
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#11 | |
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Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,838
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Re: Brakes
Quote:
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