Brake Caliper FN 3, Servicing

Front brake caliper, servicing FN 3 brake caliper, servicing

Note:
^ When carrying out repairs, install all parts supplied in repair kit.
^ Only use mineral spirits to clean brake parts.
^ Apply thin coat of assembly paste G 052 150 A2 to brake cylinders, pistons and seals.





1 - Dust cap
^ Push onto bleed valve
^ Secures brake pad wear indicator wiring

2 - Bleed valve, 12 Nm
^ Apply a thin coat of assembly paste G 052 150 A2 to the threads before screwing in.

3 - Caps
^ Insert into bushing

4 - Guide pins, 30 Nm
5 - Bushing
^ Insert into brake caliper

6 - Brake caliper
7 - Carrier
^ Fastened with brake caliper

8 - Retaining spring
^ Press under the carrier and insert into both bores of the brake caliper

9 - Oil seal
^ Removing and installing go to Piston for FN 3 brake caliper, removing and installing

10 - Piston
^ Removing and installing go to Piston for FN 3 brake caliper, removing and installing

11 - Protective cap
^ Do not damage when inserting piston

Piston for FN 3 brake caliper, removing and installing

Special tools, testers and auxiliary items required





^ Disassembly wedge 3409





^ Piston resetting tool T10145





^ Assembly device for protective cap T10146/1

Removing





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

Set a piece of wood into the valley, so that the piston is not damaged.





- Remove protective cap from brake caliper with disassembly wedge 3409.

A - Protective covers





- Remove oil seal with disassembly wedge 3409.

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 mineral spirits and then dried.
- Thinly coat piston and seal with assembly paste G 052 150 A2 before inserting.
- Insert oil seal into brake caliper.





- Set protective cap - A - in assembly device T10146/1 - 1 -





- Press protective cap with assembly device T10146/1 - 1 - and piston resetting tool T10145 - 2 - into brake caliper applying equal pressure all around.

Check that the protective cap is completely seated:





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





- Press piston lightly against protective cap and lock it into position, e.g. with disassembly wedge 3409 - 2 -.

To avoid damaging the seal sleeve, do not angle piston.
- Inflate protective cap with pressurized air (maximum 3 bar) - 1 -
- Thereby the protective cap is forced over the piston.

A - Protective covers





- Press piston into brake caliper with piston resetting tool T10145 - 1 -.

The outer seal lip of the protective cap slips into the groove on the piston.