Brake Caliper Piston, Removing and Installing

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





^ 3272 Resetting and removal tool





^ 3409 Wedge
^ Bleeder container

Removing





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

Note:
^ Install special tool 3272 so that the collar (arrow) is before the piston.
^ If piston is difficult to move, use a 13 mm (0.512 inch) 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.
- Thinly coat piston and seal with lubricant G 052 150 A2 before inserting.
- Insert oil seal in brake caliper housing.





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





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

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





- Screw piston into housing by turning knurled wheel clockwise.

Note:
^ Install special tool 3272 so the collar (arrow) of the tool is seated on the brake caliper.
^ If piston is difficult to move, use a 13 mm (0.512 inch) AF open end wrench on flats (arrow A) provided for this purpose.
^ 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, fill 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.