Question about 1992 Chevrolet Cavalier

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I have no front brakes until i drive the car for 5 min or so.

I have replaced the master cyl. front and rear brakes "major". abs hydraulic unit, module and relay. the car has perfict braking after driving for short distance. after i shut the car off and restart it the front brakes quit untill i drive it for awhile. help.

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Sounds like the booster is not working correctly. In the booster or on the intake line right next to the master cyclinder there is a check valve. The intake lines sometimes get carbon in them. You can check it by: letting it sit for a while and removing the check valve and you should hear a release of air (vacuum). If you do not hear this then replace the check valve.$12~$14. Or start the motor with the check valve of fand place your thumb over the check valve and see if you get strong vacuum. If it's weak, it needs to be replaced.

Posted on Jan 04, 2009

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Posted on Jan 02, 2017

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