93 gc rear brakes lock n stay locked

[rusty1]

I have a 93 gc and every once in awile the back brakes lock up and stay on not letting the jeep go anywhere.The brake light comes on but not the abs light.changed the rear brakes lubed emergancy brake.Seems to do it on warmer days and after returning after a couple of hours no problem.This is very frustrating seing how it is the wifes and i always get called to pick her up she wants out and i say lets fix it.Any help would be much apreciated.

[dksob81]

Disc or Drum?

[rusty1]

Originally Posted by rusty1

I have a 93 gc and every once in awile the back brakes lock up and stay on not letting the jeep go anywhere.The brake light comes on but not the abs light.changed the rear brakes lubed emergancy brake.Seems to do it on warmer days and after returning after a couple of hours no problem.This is very frustrating seing how it is the wifes and i always get called to pick her up she wants out and i say lets fix it.Any help would be much apreciated.

drum

[dksob81]

OK, maybe the Wheel Cylinder (brake cylinder) is sticking. or possibly a crushed line.

When the brakes lock-up is it after you press on the pedal, or do they lock up by themselfs?

[Cam7]

Do both rear brakes stay locked or is it just one? If one is locked it could be out of adjustment or the shoes may be bent or binding due to a wheel cylinder. If both brakes are locking could be the proportioning valve . Could also be the Master Cylinder most probally the prop valve. If you ABS light comes on it could be the ABS Rear Wheel Atilock Valve. Take the rear drums off and inspect the shoes True and brake fluid also check the Parking Brake cable to make sure it is not out of adjustment and not seized . Check the Parking Brake Cable First and go from there.

[rusty1]

[I did do one cylender and the other seemed fine,emergency brake is fine too.The wife said it almost happend the day before yesterday the brake light came on and she felt the back brakes pulling and smelled brakes all the way home.Yesterday we took it to a jeep dealer and he said the right rear brakes were melted and quoted us 900.00 for a brake job.Ha Ha.this weekend i will be going to town with new pads shoes wheel cylinders calipers spring kit master cylender and taking apart the proportioning valve and i will change all the fluid.If this doesn't work who nows what is going to happen to it.