Rear brake caliper piston, removing and installing

Special tools, testers and auxiliary items required

Fig 1: Resetting Extracting Tool T10165

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fig 2: Plate 3272/1

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Fig 3: Identifying Trim Removal Wedge 3409

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Removing

Fig 4: Extracting Piston From Brake Caliper Housing By Turning Knurled Wheel Counter-Clockwise

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Extract piston from brake caliper housing by turning knurled wheel counter-clockwise.

NOTE:

Install reset and screw out tool 3272 so that the collar is positioned against the piston.
If piston is difficult to move, use a 13 mm open end wrench on the flats - arrow A -.

Fig 5: Removing Seal Using Wedge 3409

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NOTE:

Installing

The surface of the piston and seal should be cleaned using only methylated spirits and then dried.
Apply a thin coat of lithium grease G 052 150 A2 to piston and seal before inserting.
Insert O-ring into brake caliper housing.

Fig 6: Placing Protective Seal With Outer Sealing Lip On The Piston

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Fig 7: Inserting Inner Sealing Lip Into The Grove In The Cylinder Using Wedge 3409

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NOTE:

Fig 8: Extracting Piston From Brake Caliper Housing By Turning Knurled Wheel Counter-Clockwise

Courtesy of VOLKSWAGEN UNITED STATES, INC.

NOTE:

Install reset and screw out tool 3272 so that the collar of the tool is positioned against plate 3272/1.
If piston is difficult to move, use a 13 mm open end wrench on the flats - arrow A -.

Pre-bleeding brake caliper

Fig 9: Identifying Bleed Valve, Standard Bleeder Bottle & Threaded Hole

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Open bleeder valve - arrow A - and, using a standard bleeder bottle, fill with brake fluid until bubble-free brake fluid flows from the threaded hole - arrow B - (brake hose connection). Close bleeder valve.

NOTE: