Rear brake squat

dmh925

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I have a 97 Sunfire that I bought about three years ago for my son to drive. The brakes seem to work fine at highway speeds, but as the car slows, the rear brakes tned to grab and the cars squats on its hind quarters. It has done this since we bought the car, but now it's gotten so bad the ABS seems to be engaging at times to keep the rear wheels from locking. The squatting is worse at 5-10 MPH with light to moderate pedal pressure.

There are no warning lights on.

I have replaced the front pads and rear shoes, camfered the leading edge of the shoes, even replaced wheel cylinders on the chance that they might be leaking minute amounts of fluid and contaminating the linings. I have cleaned and adjusted the brakes many times, even took it to the dealer who charged $60 to clean and adjust and declare everything in order. Cleaning all the dust out does seem to help for about a week, then we're right back where we started.

Where do I go from here?
 
Did you try installing Delco shoes in the rear? Another thought is a bad proportioning valve. There also is a Technical Service Bulletin.

Make / Models: Model/Build Years: CHEVROLET / CAVALIER 1995-1997PONTIAC / GRAND AM 1996-1997PONTIAC / SUNFIRE 1995-1997Service Bulletin Number: 735018 NHTSA Item Number: 600221 Summary:
COMMENTS THAT THE REAR BRAKES MAY DRAG/HEAT UP OR REAR OF CAR IS SQUATTING DUE TO AGGRESSIVE REAR BRAKE. *YC
 
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Is there a way to test the proportioning valve? I'm leaning that way but would like to know if it's really bad before I go to the trouble of replacing it. Also, is there any way to get the text of the TSB? I saw references to it online, but could never get anything more than just the title.
 
I had the same problem with the TSB. You can try a local GM dealer or a private shop that subscribes to the information. I would pursue that before doing anything else.
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I put A/C Delco Original Equipment brake shoes on, replace the drums too for good measure. No more problems. Stops level and smooth every time, with no grabbing, or squatting in the rear
 
I had the exact same issue with a 93 Cavlier which was corrected with the Delco shoes. They obviously use a different material that is specific to work with the hydraulics on this generation of cars.
 
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