Parking Brake Actuator: Service and Repair

Electro-Mechanical Parking Brake Actuator

Special tools, testers and auxiliary items required

• Torque wrench (V.A.G 1331)

• Vehicle diagnosis, testing and information system (VAS 5051 B) or (VAS 5052)

Removing

• Ignition off

• Ignition must be switched off for at least 30 seconds when disconnecting the motor connector!

• parking brake released

• DTC memory interrogated, errors shown corrected and DTC memory erased.

- Raise the vehicle.

- Remove the wheels.

• Ignition must be switched off for at least 30 seconds when disconnecting connector!

• Clean the entire area around the connector and actuator/brake caliper.

• Disconnect actuator connector - 1 -.






- Remove both actuator bolts - 1 -.






- Remove the actuator in the direction of the arrow






- Remove sealing ring with a suitable tool.






Make sure that ring groove of the seal and contact surface of parking brake actuator do not become damaged.

• Do not use any tools with sharp edges.

- Clean ring groove and contact surfaces if dirty. Only use brake cleaner.

Installing

- Install new seal.

- Turn the brake caliper adjuster screw - 1 - back slightly.






• This makes it easier to install the actuator.

- Position the actuator.

• Make sure that the seal is seated correctly

- Item - 2 - Then rotate actuator so bolt hole - a - and threads in brake caliper housing - b - are brought into alignment.






Make sure that parking brake actuator is seated flush against the brake caliper.

- Attach both actuator bolts (Torx 30).






Position the motor bolts by hand and screw in a few turns. If threads are damaged, entire brake caliper must be replaced!

- Tighten the motor bolts. Tightening specification, 12 Nm

- Connect the connector to the motor.

• Only insert connector by hand to avoid damaging it.

• Make sure that connectors on vehicle side and actuator side are free of dirt and damage.

- Install the motor in the bracket.

- Install the wheels => Wheels and Tires 44.

After replacing actuator, basic setting 006 must be performed with the vehicle diagnostic tester in the EPB function.

- Connect the vehicle diagnosis, testing and information system (VAS 5051B) or (VAS 5052) to the 16-pin diagnostic connector in the vehicle with the ignition switched off.






• Ignition on

• parking brake released

• Coding check and reported if necessary.

• DTC memory interrogated, errors shown corrected and DTC memory erased.

- Select function "053 - Parking brake".

- Select the function "006 - Basic setting".

- J540 - Electro-Mechanical Parking Brake Control Module

- J540 - Basic setting (3 electrical parking brake function test).

- Press the green arrow button at the bottom on the left side to exit the entry template.