Removal and installation of the piston for brake caliper FN 3

Note: When performing repairs, install the entire repair kit.

Note: Use only alcohol to clean the brakes.

Note: Apply a thin layer of assembly paste G 052 150 A2 to the brake cylinders, pistons and seals.

Removing

Press the piston out of the brake caliper with compressed air.



Underlay a wooden panel to prevent damage to the piston (pic. 6.26).




Remove the protective cap with wedge 3409 from the brake caliper (pic. 6.27).



Remove the O-ring using wedge 3409 (pic. 6.28).

When removing, make sure that the surface of the cylinder is not damaged.

Installation

Surfaces of pistons and sealing rings clean only with alcohol and then dry.

Apply a thin coat of assembly paste G 052 150 A2 to the piston and sealing ring before installation.

Insert the O-ring into the brake caliper.



Install protective cap A in installation tool T10146/ 6 1 (pic. 6.29).




Install the protective cap using the assembly tool 1 and the piston sinker 2 on the brake caliper in such a way that it rests on the brake caliper all around (pic. 6.30).

Checking the fit of the protective cap

The protective cap must be firmly seated so that it cannot be removed from the caliper by hand (pic. 6.31).



Lightly press the piston on the protective cap and fix it in this position, for example, using a wedge 2 (pic. 6.32).

Do not distort the piston, as otherwise, damage to the sealing cuff is possible.

Blow out the protective cap with compressed air (Max. 3 bar) 1. In this case, the protective cap will be put on the piston (pic. 6.32).




Press the piston into the brake caliper using piston sinker 1 (pic. 6.33).

In this case, the outer sealing edge of the protective cap will enter the groove on the piston.