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Brake piston stuck, how to get it working again? Important note, when pressing the pedal, do not continue as you normally would when braking. It MAY be that a slight wear mark has formed in the master brake cylinder, which could damage the cuff if it overflows. IMPORTANT, do not use rust removers, WD 40 or similar!!!! IMPORTANT !!!!! Danger of crushing Disclaimer This video is only intended to illustrate my methodology and does not guarantee that a specific result will be achieved. To achieve the best result, qualified specialist personnel are recommended. This video only contains tips and recommendations that may be helpful when repairing a car or replacing parts.