Audi Workshop Service and Repair Manuals

Special tools and workshop equipment required

• ◆ 3409 Assembly wedge
• ◆ Piston resetting tool

Removing

• ‒ → Press piston out of brake caliper housing using compressed air.

Note:

Place a piece of wood in the recess to prevent damaging the piston.

• ‒ → Remove protective cap from piston groove.
• ‒ For this purpose, use removal wedge 3409.
• ‒ Remove piston.

Note:

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

• ‒ → Remove protective cap.
• ‒ For this purpose, use removal wedge 3409.

• ‒ → Remove sealing ring.
• ‒ For this purpose, use removal wedge 3409.

Note:

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

Installing

• ‒ The surface of the piston and sealing ring should be cleaned using only methylated spirits and then dried.
• ‒ Before inserting, thinly coat piston and sealing ring with assembly paste (lithium grease) G 052 150 A2.
• ‒ → Insert inner sealing ring.

• ‒ → Place protective cap with the outer sealing lip on the piston.
• ‒ Thinly coat piston and sealing ring with assembly paste G 052 150 A2 before inserting.

• ‒ → Using removal wedge 3409, insert the inner sealing lip into the groove on the cylinder.

Note:

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

• ‒ → Press the piston into the brake caliper housing by hand.

• ‒ → Press piston into brake caliper housing.

Note:

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