Disc Caliper: Disassembly

Clean exterior of caliper with denatured alcohol and place on clean work surface. Remove brake hose, discarding copper gasket. Drain brake fluid from caliper.
Use clean shop towels to pad interior of caliper and apply compressed air at caliper inlet to remove piston. Use just enough pressure to ease piston out of bore.
WARNING: DO NOT attempt to catch or protect piston with fingers while applying compressed air. Injury may result. Always use eye protection when performing this step.

Fig 1: Using Compressed Air to Remove Caliper Piston Compressed air must be filtered and dry.
Use screwdriver to pry boot out of caliper housing. Pry piston seal from its groove in caliper bore with a piece of wood or plastic. Do not use metal tool of any type to remove piston seal. Remove bleeder valve from housing.