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rear brakes lock up on 1992 Chevrolet Cavalier

it started with the dr. side rearlocking up,it would do it once in a while.now all the time. 2 wks later the other wheel started doing the same thing.now if you just toutch the peddle,both rear wheels lock up.replaced master+brake fluid.what else could it be????

Asked by for the 1992 Chevrolet Cavalier
Did you check the wheel cylinders on each brake? Sounds like leaking fluid onto brake linings. Master cylinder wouldn't cause this type problem.