Rear Brake Caliper Piston with Electromechanical Parking Brake

Rear Brake Caliper Piston with Electromechanical Parking Brake

Special tools, testers and auxiliary items required

• Torque Wrench (V.A.G 1331)

• Torque Wrench (V.A.G 1332)

• Piston Resetting Tool (T10145)

• Disassembly Wedge (3409)

• Vehicle Diagnosis, Testing and Information System (Vas 5051B) Or (Vas 5052)

Removing

- Remove pistons as far as possible from brake caliper

- Force piston out of brake caliper housing using compressed air.





• When removing, make sure that surface of cylinder is not damaged.

• Place a wooden board into the recess of the caliper housing so it is not damaged.

- Remove old seal from brake caliper with Trim Removal Wedge (3409).





Installing

- Install new seal in brake caliper.





- Place new protective cap on brake pistons as shown.





- Install pressure nut to dimension - a - 15 mm.





- Insert protective cap in brake caliper groove. Use Trim Removal Wedge (3409) to do so.





- Carefully slide brake piston into brake caliper. Move brake piston when doing so. Brake piston must be guided over pressure nut, this is only possible in four positions.

- After brake piston has been guided onto pressure nut, press it as far as stop into brake caliper.





• Make sure that pressure nut is not damaged.

- Install pressure nut clockwise as far as stop.





- Make sure the rubber makes contact around brake caliper housing - arrows -





- Press piston into brake caliper by hand





• The inner sealing lip of the protective cap thereby slips into the groove on the piston.

• Bleed the brake system after servicing and installing the brake caliper. Refer to => [ Bleeding Brake System ] Procedures