1986 Chevy Camaro stuck brakes

Tiny
SOXSDAD
  • MEMBER
  • 1986 CHEVROLET CAMARO
Brakes problem
1986 Chevy Camaro

I have replaced the calipers on both side as well as the master cylinder. When I press on the brakes the pedal is very hard and the front brakes lock and wont release. This car has also sat for many years.
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Saturday, August 1st, 2009 AT 2:05 PM

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Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You sure its not the back brakes that's causing it-

HARD BRAKE PEDAL Lack of power assist may be due to low engine vacuum, a leaky vacuum hose or a defective booster. Sometimes a faulty check valve will allow vacuum to bleed out of the booster causing a hard pedal when the brakes are applied. This condition can be diagnosed by starting the engine (to build vacuum), shutting it off, waiting four or five minutes, then trying the brakes to see if there is power assist. No assist means a new check valve is needed.

A quick way to check the vacuum booster is to pump the brake pedal several times with the engine off to bleed off any vacuum that may still be in the unit. Then hold your foot on the pedal and start the engine. If the booster is working, the amount of effort required to hold the pedal should drop and the pedal itself may depress slightly. If nothing happens and the vacuum connections to the booster unit are okay, a new booster is needed (the vacuum hose should be replaced, too).
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Saturday, August 1st, 2009 AT 2:31 PM

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