Audi Workshop Service and Repair Manuals

Special tools and workshop equipment required

• ◆ 3409 Assembly wedge
• ◆ Piston resetting tool
• ◆ Assembly paste G 052 150 A2

Removing

→ Fig.1    Using compressed air to press pistons individually out of brake caliper housing

Note:

Insert brake pad -b- into the piston. Position wooden block -a- in recess to avoid piston damage.

Only one piston can be pressed out at a time. At the same time, hold other piston in position in brake caliper housing using piston resetting tool.

→ Fig.2    Using wedge -3409- to remove sealing rings

Ensure that the surface of the cylinder is not damaged during removal.

Installing

• ‒ Thinly coat piston and sealing ring with assembly paste G 052 150 A2 before inserting.
• ‒ The surface of the piston and sealing ring should be cleaned using only methylated spirits and then dried.

→ Fig.3    Attaching outer sealing lip of protective cap to piston.

→ Fig.4    Inserting inner sealing lip of protective cap with wedge -3409-

Note:

At the same time, hold piston in front of brake caliper housing.

→ Fig. 5    Press the piston into the brake calliper housing using a piston resetting tool.

Note:

Insert piston by hand into the bore and then insert brake pad -a- into the piston before pressing into brake caliper housing.

The outer sealing lip of the protective cap will then locate in the groove on the piston.