Rear Brake Caliper Piston, Removing and Installing

Rear brake calipers (C38)

Rear brake caliper piston, removing and installing
Special tools and equipment





^ 3272 Resetting and removing tool
^ 3272/1 Connection to the resetting and removal tool





^ 3409 Assembly wedge
^ Bleeder bottle

Removing





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

Notes:
^ Fit special tool 3272 so that the collar (arrow) is located in front of the piston.
^ If piston is difficult to move, use a 13 mm AF open jaw spanner on the flats (arrow A) provided for this purpose.





- Remove seal using assembly wedge 3409.

Note: Ensure that the surface of the cylinder is not damaged during removal.

Installing
- he surface of the piston and seal should be cleaned using only methylated spirits and then dried.
- Thinly coat piston and seal with assembly paste G 052 150 A2 before inserting.
- Insert the O-ring into the brake caliper housing





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




- Using assembly wedge 3409, insert the inner sealing lip into the groove on the cylinder.

Note: When doing this hold piston in front of brake caliper housing.





- Screw piston into housing by turning knurled wheel clockwise.

Notes:
^ Fit special tool 3272 so that the collar of the tool is seated against special tool 3272/1.
^ If piston is difficult to move, use a 13 mm AF open jaw spanner on the flats (arrow A) provided for this purpose.

- Install brake pads.





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

Note: Position brake caliper as illustrated for pre-bleeding.