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 bottle

Removing







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

Notes:
^ Use special tool 3272/1 to help screw in.
^ If piston is difficult to move, use a 13 mm 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 paste G 052 150 A2 to piston and seal before inserting.







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







^ Using 3409 wedge, insert the inner sealing lip into the groove 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 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.