Front Brakes, FN 3

Brake Caliper Piston

Special tools, testers and auxiliary items required

• Trim removal wedge (3409)

• Piston resetting tool (T10145)

Removing

• Place a wooden board into the recess of the caliper housing to catch the piston so it is not damaged.

- Force piston from brake caliper housing using compressed air.





- Remove seal using trim removal wedge (3409).





• When removing, make sure that surface of cylinder is not damaged.

Installing

- Use only appropriate solvent to clean surfaces of piston and protective seal, then dry.

- Apply thin coat of assembly paste (G 052 150 A2 ) to piston and protective seal before installing.

- Install sealing ring in brake caliper housing.

- Place protective cap with outer sealing lip on piston.





- Using trim removal wedge (3409 ), insert inner sealing lip into cylinder groove.





• Hold piston in front of caliper housing for this procedure.

- Press piston into brake caliper housing using piston resetting tool (T10145 ).





• Outer sealing lip of protective cap will then engage in piston groove.