FN 3

FN 3 front brake calipers, assembly overview

Note:
^ When carrying out repair install all parts supplied in repair kit.
^ New brake calipers are filled with brake fluid and are pre-bled.
^ Apply a thin coating of assembly lubricant G 052 150 A2 to brake cylinders, pistons and seals.

FN 3 front brake calipers, assembly overview:

1 - Dust cap
2 - Bleeder valve
^ Apply a very thin coating of assembly lubricant G 052 150 A2 to threads before installing

3 - Cap
^ Insert into mounting bushing

4 - Guide pins, 28 Nm
5 - FN 3 front brake calipers, assembly overview
^ Insert into brake caliper housing

6 - Brake caliper housing

7 - Brake carrier
^ Bolt to brake caliper housing

8 - Retaining spring
^ Insert both ends into holes in brake caliper housing

9 - Seal

10 - Piston
^ Apply a very thin coating of assembly lubricant G 052 150 A2 to piston before inserting
^ Piston diameter 54 mm

11 - Protective seal
^ Do not damage when inserting piston

Front caliper piston, removing and installing

Special tools, testers and auxiliary items required

^ Trim removal wedge 3409

^ Piston resetting tool T10145

Removing

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

Note:
^ Place a piece of wood in the recess to prevent damage to the piston.

- Remove seal using trim removal 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 methylated spirit and then dried.
- Apply a very thin coating of assembly lubricant G 052 150 A2 to piston and seal before installing.
- Insert seal into brake caliper housing.

- Place protective seal with outer sealing lip on the piston.

- Using trim removal wedge 3409, insert inner sealing lip into groove in cylinder.

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

- Press piston into brake caliper housing using piston resetting tool T10145.

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