FNR-G

Brake Caliper Piston

Special tools, testers and auxiliary items required

• Trim removal wedge (3409)

• Piston resetting tool (T 10145)

• Disk (T 10146/6)

Removing

- Force the piston from the brake caliper using compressed air.

Place a wooden board into the recess of the caliper housing so it is not damaged.





- Remove the protective cap from the brake caliper using the trim removal wedge (3409).

- Remove the seal using the trim removal wedge ( 3409).





When removing, make sure that surface of 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.

- Install the seal into the brake caliper.





- Insert the protective cap - A - into the disk (T 10146/6) - 1 -.





- Press the protective cap with the disk (T 10146/6 ) - 1 - and the piston resetting tool (T 10145) - 2 - into the brake caliper so that it contacts the brake caliper all around.





Check Seating of Protective Caps

- Protective cap must no longer be able to be pulled from brake caliper by hand.

- Lightly press the piston against the protective cap with an extension and ratchet adapter - 1 - and hold it there, in that position.





Do not angle piston, to avoid damaging the seal sleeve.

- Blow the protective cap on with pressurized air (max. 3 bar) - 2 -. Protective cap springs on to piston.

- Press the piston by hand into the brake caliper, possibly push back slightly with piston resetting tool (T 10145).

Outer sealing lip of protective cap will then engage in piston groove.