I have an automatic 1990 Iroc camaro with rear disc brakes.

Recently I suspected that my rear brakes were no longer working. I confirmed my hunch by jacking up the rear of the car and putting it in drive and steping on the brakes. The tires slowed down but the brakes failed to stop the rear tires from spining.

I then proceded to bleed all of my brakes and this ended up fixing the problem for a few days. But now my rear brakes are acting up again. The brake pedal is all mushy again and the car dosen't want to stop now.

I checked the brake fluid level and it appeared to be normal, no fluid loss that I can tell of. The master cylinder was recently replaced, and the rear brake pads are only worn half way. I was told that it could be my master cylinder (seems unlikely) or my rear calipers. What do you guys think?

 

Mushy is generally a sign of moisture in the fluid. I'd change it out with fresh stuff.

 

I already changed out the brake fluid recently. It fixed the problem for a few days but then it came right back.

 

Was the master cylinder bled on the bench first? If it wasn't it will never work properly. Did you do it yourself or a local shop?

Andy.

 

My guess then is that you are pulling air into the system.

 

The master cylinder has been bench bled.

I can firm up the pedal by bleeding the brakes, but it only lasts a few days. Somehow I am pulling air in the system without leaking brake fluid. Could it possible be through the rear calipers?

 

You definitely have a leak somewhere. If you have the time, put it up on jacks again and have a friend stand like mad on the brake pedal and look around for leaks. Odds are it's the thing you last messed with that is giving you the problems.

Ed