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