Rear Brake Caliper Piston, Removing and Installing

Rear brake caliper piston, removing and installing





Special tools required

Removing





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

Notes:
- Insert special tool 3272/1 between brake caliper housing and special tool 3272.
- If piston is hard to move, use 13 mm open end wrench (arrow A).
- Position special tool 3272 so collar (arrow) is before piston.





- Place protectiv4 seal with outer lip on piston.





- Remove seal with plastic wedge 3409 or equivalent.

Note: Ensure cylinder surface is not damaged when removing.

Installing
- Clean piston surface and seal with clean solvent only.
- Thinly coat piston and seal with lubricant G 052 150 A2 before installing.





- Install inner sealing lip in cylinder grove with wedge 3409.

Note: Hold piston in front of caliper housing while performing this step.





- Turn piston into housing by turning knurled wheel clockwise.

Note:
- Position special tool 3272/7 between brake caliper housing and special tool 3272.
- Position special tool 3272 so collar (arrow) of tool is seated against brake carrier
- If piston is hard to move, use 13 mm open end wrench (arrow A).

CAUTION:
- Use a bleeder bottle to extract part of the brake fluid from the brake fluid reservoir before pushing back the pistons
- If this is not done, brake fluid may overflow and cause damage.

- Install brake pads.

Pre-bleeding brake caliper





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

Note: When pre-bleeding, position brake caliper as shown in illustration.