Piston For Rear Brake Caliper, Removing and Installing

Piston for rear brake caliper, removing and installing

Special tools, testers and auxiliary items required





^ Reset and screw out tool 3272
^ Plate 3272/1





^ Wedge 3409





^ Piston resetting tool T10145
^ Bleeder container

Removing





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

Note:
^ Install the reset and screw out tool 3272 so that the collar - arrow - is in front of the piston.
^ If the piston is difficult to move, use a 13 mm open end wrench on the flats - arrow A - provided for this purpose.





- Remove seal with wedge 3409.

Note: When removing make sure that the surface of the cylinder is not damaged.

Installing
- The surface of the piston and seal must only be cleaned with mineral spirits and then dried.
- Thinly coat piston and seal with assembly paste G 052 150 A2 before installing.
- 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.





- Install piston into housing by turning knurled wheel clockwise.

Note:
^ Install reset and screw out tool 3272 in such a way that the collar of the tool is seated on plate 3272/1.
^ If the piston is difficult to move, use a 13 mm open end wrench on the flats - arrow A - provided for this purpose.

- Insert brake pads.

Pre-bleeding brake caliper





- Open bleeder 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 bleeder valve.

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