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Now begin the tricky process of getting the caliper pistons out of their cylinders. The pistons move in and out to press the pads against the rotor. One way to do it is to use deep-reach Vise-Grips like these to hold the other pistons in position and then place an air chuck against the brake fluid inlet fitting and blowing pressurized air into the caliper. The air pressure should blow the piston out of the bore.