having problems with brake system on 91 Chevy cavalier with engine off, br ake pedal is good. When engine is on, pedal goes to the floor. Have repla ced shoes, rotors, calipers, and 2 masters cylinder (one rebuilt, one new. The brake pedal makes a hissing, when pushing the brake. Sounds sort of li ke air in a vacuum line. i'm thinking the booster needs replaced, any tho ughts or suggestion?
- posted
7 years ago