Rear Brake Caliper Piston, Removing and Installing

Rear brake caliper piston, removing and installing

Special tools and equipment





^ 3272 Piston resetting and removal tool





^ 3409 Wedge
^ Bleeder container

Removing





- Remove piston out of brake caliper housing by turning the knurled wheel counterclockwise.

Note:
^ Use special tool 3272/1 to help screw in.
^ If piston is difficult to move, use a 13 mm (.512 in.) AF open end wrench on the flats (arrow -A-) provided for this purpose.





- Remove seal using wedge 3409.

Installing
- The surface of the piston and seal must only be cleaned with methylated spirits and then dried.
- Apply a thin coat of assembly lubricant G 052 150 A2 to piston and seal before inserting.





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





- Using wedge 3409, insert the inner sealing lip into the grove in the cylinder.

Note: Hold piston in front of caliper housing.





- Screw piston into housing by turning knurled wheel clockwise.

Note:
^ Use special tool 3272/1 to help screw in.
^ If the piston is pushed back with a piston resetting tool or by operating the foot brake the automatic adjustment in the brake caliper is destroyed.
- Install brake pads.

Pre-bleeding brake caliper





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

Note: Position brake caliper as illustrated to pre-bleed.