2FN

Brake Caliper Piston, 2FN, Removing and Installing

Special tools, testers and auxiliary items required





^ Removing wedge VAS 3409
^ Piston resetting tool

Removing





- Force piston out of brake caliper housing using compressed air.

Note:
^ Place a piece of wood in the recess to prevent damaging the piston.
^ You can only remove one piston at a time; hold the other piston in the caliper housing using the piston resetting tool.





- Remove protective seal from piston groove using Removing wedge VAS 3409.
- Take out piston.

Note:
^ Make sure that the surface of the cylinder is not damaged, when removing.





- Take out protective seal using Removing wedge VAS 3409.





- Use Removing wedge VAS 3409 to remove seal.

Note:
^ Make sure that the surface of the cylinder is not damaged, when removing.

Installing

- The surface of the piston and seal must be cleaned with methylated spirits only, and then dried.





- Thinly coat piston and seal with assembly paste G 052 150 A2 before inserting.
- Insert seal in brake caliper housing.





- Position outer sealing lip of protective seal on piston.





- Insert the inner sealing lip into the grove in the cylinder, using Removing wedge VAS 3409.

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





- Press piston into brake caliper housing as far as possible by hand.





- Press piston into brake caliper housing using piston resetting tool.

Note:
^ The outer sealing lip of the protective seal will then locate in the piston groove.