Front Brake Caliper Piston, FNRG57

Front Brake Caliper Piston, FNRG57

Special tools, testers and auxiliary items required

• Disassembly wedge (3409)

• Piston resetting tool (T10145)

• Assembly tool (T10146)

• Assembly device for protective cap (T10146/2)

Removing

- Force piston from brake caliper housing using compressed air.






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

- Remove seal.






- Use the (3409) for this.

• 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 lithium grease (G 052 150 A2) before inserting.

- Using (3409) , insert the inner seal into the groove in the brake caliper.






- Press in the protective cap using special tool - 1 - and - 2 -.






- - 1 - (T10146/2)

- - 2 - (T10145)

Use protective backings

- Press the protective cap onto the brake caliper housing so that it contacts the brake caliper housing all around - arrow -.






- It should no longer be possible to remove the protective cap from the brake caliper housing by hand.

- Thinly coat piston and seal with lithium grease (G 052 150 A2) before inserting.

- Lift the brake piston, as shown, with commercially available extension and ratchet adapter and lightly press against the protective cap.






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

- Blow the protective cap on with pressurized air (max. 3 bar). The protective cap will thereby jump over the brake piston.

Use protective backings

- Press piston into the brake caliper housing by hand.

• The inner sealing lip of the protective cap thereby slips into the groove on the piston.