back brakes are grabbing before car stops

1986 MERCURY MARQUIS
300,000 MILES
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AJBLOCTON
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My 1986 mercury grand marquis, would this be a brake pressure differential valve causing the problem? rear brakes grabbing when stopping
Jan 11, 2012 at 10:00 PM
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RIVERMIKERAT
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Could be or it could be the brakes are improperly adjusted.
Jan 11, 2012 at 10:11 PM
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RASMATAZ
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What type of brakes do you have on the rear?
Jan 11, 2012 at 10:11 PM
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AJBLOCTON
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tried brake adjustment. reardrum , front disk
Jan 11, 2012 at 10:14 PM
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RIVERMIKERAT
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Check the wheel cylinders, they may be contaminated and not allowing the shoes to retract.
Jan 11, 2012 at 11:18 PM