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calipers can lock up for more than one reason. first reason is dirt and grime in the caliper and pistons.next ,if the brake pads are worn,the pistons can travel to far when brakes applied, leaving room for the pistons to come out of alignment and not be able to retract when brakes are released the brake caliper itself may be faulty. if this needs replacing, it is better to buy a balanced and matched pair and replace both rear at same time so if the problem is not at the caliper, it can be any one of a number of valves or even the master cylinder. generally you would discount the master cylinder unless all brakes were sticking

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8y ago

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