Removing and installing brake caliper piston – front brake FNR-G — VW

🧭 Before you start

Fits: platform code 138

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• Place a piece of wood in brake caliper to prevent damage to piston.
• When removing ensure that the surface of the piston is not damaged.
• Keep piston straight to prevent damage to sealing collar.

📋 Procedure

1. Unscrew bleed valve. [Note: Place a piece of wood in brake caliper to prevent damage to piston.]
2. Press piston out of brake caliper using compressed air gun (arrow).
3. Lever off protective cap from brake caliper using removal wedge3409.
4. Remove seal using removal wedge3409. [Note: When removing ensure that the surface of the piston is not damaged.] [Note: 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 in brake caliper (arrow).
7. Fit protective cap (A) in assembly tool T10146/1(1).
8. Press protective cap onto brake caliper so that it lies on brake caliper all around using assembly tool (1) and piston resetting tool T10145(2).
9. At this stage it should not be possible to remove protective cap from brake caliper by hand.
10. Gently press piston onto protective cap using extension and ratchet tool (1). Hold piston in this position. [Note: Keep piston straight to prevent damage to sealing collar.]
11. Blow protective cap on over brake caliper with compressed air (max. 3 bar) (2). Protective cap will spring over the piston.
12. Press piston into brake caliper by hand. If necessary, gently re-press using piston resetting tool T10145.
13. Screw in bleed valve.

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