Caution: Do not separate the brake caliper halves!
Remove the brake caliper.
Remove keeper from retaining pin (1).
Drive out the retaining pin (1) from the wheel side.
Remove brake pads by pulling downwards.
Close the bleed screw.
Tightening torque: Bleed screw in brake caliper — 14 Nm
Secure two opposing brake pistons with resetting tool, BMW No. 341500.
Place a cloth between the other pair of pistons.
Caution! Do not insert your fingers between the pistons; risk of injury
Carefully press out brake pistons (2), using a compressed air gun at the brake line connection.
Remove the two sealing rings (3,4) from the left and right brake cylinder bores.
Inspect the brake caliper piston for hairline cracks, score-marks and other damage.
Coat new sealing rings (3,4) with brake fluid and install.
Caution! Keep the brake pistons parallel with their bores when installing.
Coat brake caliper pistons (2) with brake fluid and insert.
Remove and install the other two brake pistons in the same way.
Using piston compressor (7), BMW No. 34 1 500, if necessary press the pistons fully back.
Install the brake pads.