Front Caliper Piston

Front Caliper Piston

The removal and installation of the pistons is identical for the various brake calipers.

Special tools, testers and auxiliary items required

• Trim Removal Wedge (3409)

• Piston Resetting Tool (T10145)

Removing

- Force the pistons out individually from the brake caliper housing using compressed air.





Only one piston can be pressed out at a time. When doing this, hold the opposing piston in the caliper housing using the (T10145) - a -. Block the other pistons, using a wood block - b -. In addition, place a wooden board - c - in front of the (T10145) so that the piston will not be damaged when pressed out.

- Remove the seal using the (3409).





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

Installing

- The surface of the piston and seal must only be cleaned with mineral spirits and then dried.

- Apply a thin coat of assembly paste (G 052 150 A2) on the piston and seal before installing.

- Insert oil seal into brake caliper.





- Install the protective cap on the piston.





- Using equal pressure, push the piston into the brake caliper housing.





The protective cap must be seated properly in the groove, push slightly farther if necessary.