Rear Brake Piston Won't Retract
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Sadly, drowssap is right. It's rust or corrosion which usually seizes the piston into the caliper bore and even taking it apart and polishing the piston and bore will probably work OK for awhile but once the coating is worn off the corrosion will set back in. Problem is the rear calipers don't work anything like as hard as the fronts so they don't get the 'exercise' needed.
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