Left Or Right Front Brake Caliper: Disassembly

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Remove caliper. See CALIPER ASSEMBLY .
Remove pads from caliper. Remove caliper piston retaining ring (if equipped) and dust boot. Insert wooden block in caliper cavity. See Fig 1.
Slowly apply air pressure to fluid inlet of caliper to force out piston. To protect piston, place a protective plate (hard wood or hard felt) in caliper recess.
Check guide sleeves (5). Fit new repair-kit guide sleeve if necessary. See Fig 2.
Remove sealing ring carefully with a plastic needle. See Fig 3.
Thoroughly inspect cylinder bore, piston and flange surfaces. Machining of cylinders and pistons is not permitted.

Fig 1: Pressing Out Piston

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 2: Locating Guide Sleeves

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 3: Removing Sealing Ring

Courtesy of BMW OF NORTH AMERICA, INC.