Remove rear brake calliper.
Remove the split-pin keeper (1) from retaining pin (2).
Drive the retaining pin out towards the wheel side.
Remove brake pads (6).
Hold a cloth over the brake calliper.
Caution! Do not insert your fingers between the pistons; risk of injury.
Carefully press out brake piston (3), using a compressed air gun at the brake line connection.
Remove the two sealing rings (4, 5) from the brake piston bore.
Examine the brake calliper piston for damage.
Installation is the reverse of the removal procedure: pay particular attention to the following.
Coat new sealing rings (4, 5) with brake fluid and install.
Coat the brake piston (3) with the assembly fluid supplied and install.
Caution! Keep the brake piston parallel with its bore when installing.
Using piston compressor, BMW # 34 1 500, if necessary press the piston fully back.
Install the brake pads.