Removing and installing brake caliper piston – front brake FN3 — VW

🧭 Before you start

Fits: platform code 138

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• Place a piece of wood in the recess to prevent damage to the piston.
• The surfaces of the piston and seal must be cleaned only with methylated spirits and then dried.
• Keep piston straight to prevent damage to sealing collar.

📋 Procedure

1. Press piston out of brake caliper using compressed air. [Note: Place a piece of wood in the recess to prevent damage to the piston.]
2. Lever off protective cap from brake caliper using removal wedge3409.
3. Remove seal using removal wedge3409.
4. The surfaces of the piston and seal must be cleaned only with methylated spirits and then dried.
5. Apply a thin coat of assembly paste G 052 150 A2 to piston and seal before inserting.

6. Insert seal into brake caliper.
7. Fit protective cap (A) into assembly tool T10146/6(1).
8. Use assembly tool T10146/6(1) and piston resetting appliance (2) to press protective cap onto brake caliper so that cap is fitted correctly all round.
9. At this stage it should not be possible to remove protective cap from brake caliper by hand.
10. Press piston lightly onto protective cap, and lock it in this position using e.g. removal wedge3409(2). [Note: Keep piston straight to prevent damage to sealing collar.]
11. Blow out protective cap using compressed air (max 3 bar) (1). During this step protective cap will spring on piston.
12. Using piston resetting appliance (1), press piston into brake caliper.

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