Removing and installing piston for front brake caliper FN3 — AUDI

🧭 Before you start

Fits: Audi A3 (8P, 2003–2012)

• Special tools named: T10146/6

📋 Procedure

1. Force piston out of brake caliper using compressed air.
2. Lever off protective cap from brake caliper using removal wedge 3409.
3. Remove seal using removal wedge 3409.
4. The surface of the piston and seal should be cleaned using only methylated spirits and then dried.
5. Apply a thin coat of lithium greaseG 052 150 A2 to piston and seal before inserting.

6. Insert seal into brake caliper.
7. Insert protective cap (A) into assembly tool T10146/6 (1).
8. Push protective cap onto brake caliper using assembly tool (1) and piston resetting appliance (2) so that it is seated on the brake caliper all round.
9. At this stage it should not be possible to remove the protective cap from the brake caliper by hand.
10. Press the piston lightly against the protective cap and lock in position (e.g. with assembly wedge (2)).
11. Inflate protective cap with compressed air (maximum 3 bar) (1). The protective cap will then locate around the piston.
12. Press the piston into the brake caliper using piston resetting appliance (1).

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