Piston, FNR-G Brake Caliper

Piston, FNR-G Brake Caliper

Special tools, testers and auxiliary items required

• Trim Removal Wedge (3409)

• Piston Resetting Tool (T 10145)

• Disk (T 10146/6)

Removing

- Force piston from brake caliper using compressed air.

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





- Remove protective cap from brake caliper with (3409).

- Remove seal with (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 inserting.

- Install sealing ring in brake caliper.





- Insert the protective cap - A - into the assembly tool T 10146/1 - 1 -.





- Press the protective cap with the assembly tool - 1 - and the piston resetting tool - 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 piston against 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 onto piston.

- Press piston with hand into brake caliper, possibly push back slightly with piston resetting tool.

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