I have two rear XT M775 brakes that have malfunctioned. One piston pushes out further than the other, and does not retract causing constant rotor rub. I've tried cleaning the pistons by extenting them out and using alcohol and the lubing them. No help. I've been told parts are not available. And never take out the big torx bolt on the side. Known fixes??? Love the brakes but dogs and birds, not so much. GBB
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Thread: XT M775 rebuild?