Rear

Caliper Piston, C38

Special tools, testers and auxiliary items required

• Resetting & extracting tool (T10165)

• or Reset and screw out tool (3272)

• Plate (3272/1)

• Trim removal wedge (3409)

• Bleeder bottle

Removing

- Extract the piston from the brake caliper housing by turning the knurled wheel counterclockwise.





• Install reset and screw out tool (3272) so that the collar is positioned against the piston.

• If the piston is difficult to move, use a 13 mm open end wrench on the flats - arrow A -.

- Use trim removal wedge (3409) to remove the seal.





• When removing make sure that the hole of the cylinder is not damaged.

Installing

- The surface of the piston and seal should be cleaned using only methylated spirits and then dried.

- Apply a thin coat of lithium grease (G 052 150 A2) to the piston and seal before inserting.

- Insert the O-ring into the brake caliper housing.

- Place the protective cap with the outer sealing lip on the piston.





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





• When doing this, hold the piston in front of the caliper housing.

- Screw the piston in by turning the knurled wheel clockwise.





• Install reset and screw out tool (3272) so that the collar of the tool is positioned against plate ( 3272/1).

• If the piston is difficult to move, use a 13 mm open end wrench on the flats - arrow A -.

- Install the brake pads.

Pre-bleeding Brake Caliper

- Open the bleeder valve - arrow A - and, using a standard bleeder bottle, fill with brake fluid until bubble free brake fluid flows from the threaded hole - arrow B - (brake hose connection). Close the bleeder valve.





• Position the brake caliper as illustrated for pre-bleeding.