I have a 96 geo prizm. I have replaced the front and back brakes. I have bled the brakes and the foot pedal is firm for about the first4 days. After the 4 days the brake pedal gets really soft and you have to push it almost to the floor for the brakes to engage. I tried bleeding the brakes again and that fixed the problem, but it is now back to being soft. Do I have a problem with my master cylinder or is there something that I am missing?
Cars & Trucks - Geo - Prizm - 1996 Geo Prizm
Answers & Comments
It sounds like master cyl. is drawing in air causing prob. also another test would bee too bleed out and get pedal back, now step on pedal and hold firmly and see if pedal creeps near floor indicating innternal leaking in master cyl. also have some one pump bakes slowly aand look for air bubbles in brake res. after bleed out indicating master cyl. is drawing air upon release of pedal.
Sounds like you have a slow leak in the braking system. It might be a rubber brake hose or caliper that's leaking air into the system.You will have to investigate each caliper, brake hose and all the brake lines to try and find that small leak, or it will just keep letting air into the system, causing that soft pedal. It is a pressurized system so that leak should have fluid coming out of it.