Wheel Bearing Unit

Wheel Bearing Unit

Special tools, testers and auxiliary items required

• Remover (T10103)

• Remover (T10103/1)

• Socket XZN 32 (T10209)

• Fitting Tool (T10206)

• Torque Wrench (V.A.G 1601)

• Torque Wrench (V.A.G 1332)

• Torque Wrench (V.A.G 1331)

• Vehicle Diagnostic Tester (VAS 5051B)

Removing

- Loosen the 12-point nut for the drive axle on the wheel hub. Refer to => [ Drive Axle Twelve-Point Nut, Loosening and Tightening ] Procedures.

The wheel bearing must not be under a load while the drive axle threaded connection on the wheel side is loose.

If the wheel bearings are under the load of the vehicle's own weight, the wheel bearing will be damaged. This reduces the service life of the wheel bearings.

The 12-point nut may only be loosened a maximum of 90° when the vehicle is resting on its wheels.

Vehicles without a drive axle must not be moved, otherwise the wheel bearing will be damaged. If a vehicle must be moved, be sure to note the following:

• Install an outer joint in place of the drive axle.

• Tighten the outer joint to 150 Nm.

Vehicles with a Steel Spring Shock Absorber






- Loosen the wheel bolts.

- Raise the vehicle.

- Remove the wheel.

- Loosen the threaded connection - arrows - between the steel spring shock absorber - 1 - and the coupling rod at the wheel bearing housing.

- Install the block of wood between the subframe - 1 - and the upper rear transverse link - 2 -.






- Press the axle down with a block of wood.

- Remove the bolt.

Vehicles with an Air Spring Shock Absorber

- Activate the vehicle lift mode and place the vehicle on the lifting platform. Refer to => [ Vehicle Lift Mode ] Description and Operation.

- Bleed the rear air spring shock absorber with the (VAS 5051B).

- Remove the wheel.

Continuation for Both Vehicles

- Remove the brake caliper and brake disc.

- Secure the brake caliper to the body so that the weight of the caliper does not stress or damage the brake hose or brake line.

- Remove the coupling rod. Refer to => [ Coupling Rod ] Coupling Rod.

- Release the harness connector - 1 - at the parking brake motor of the electro-mechanical parking brake and disconnect.






- Release the connector - 1 - from the rear speed sensor and remove it.






- Unscrew the bolt - arrow - and remove the bracket - 1 - with the lines.






- Set up the tools as shown in the figure.






1. (T10103/1)

2. (T10103)


- Press the drive axle out of the wheel bearing housing to the stop.

- Unscrew the bolts - arrows - above the drive axle.






- Unscrew the bolts - arrows - below the drive axle.






- Remove the wheel bearing unit from the drive axle.






1. (T10103/1)

2. (T10103)


- Remove the wheel bearing unit together with the (T10103).

• Avoid contaminating with dirt and damaging the seal when setting down/storing.

The wheel bearing - 1 - must always face up.






- Always set the wheel bearing unit down on the wheel hub - 2 -.

The same procedure also applies to the wheel bearing without a wheel hub.

Installing

Install in reverse order of removal. Note the following:

- Tighten the bolts - arrows - below the drive axle by hand.






- Tighten the bolts - arrows - above the drive axle by hand.






- Tighten the wheel bearing unit bolts.

- Pull in the drive axle.






1. (T10206)


- Install the coupling rod.

Vehicles with a Steel Spring Shock Absorber






- Install the block of wood between the subframe - 1 - and the upper rear transverse link - 2 -.

- Press the axle down with a block of wood.

- Loosen the bolt - arrows - between the steel spring shock absorber - 1 - and the coupling rod at the wheel bearing housing.






- Tighten the threaded connection by hand.

Continuation for Both Vehicles

• The coupling rod may only be bolted when the dimension "a" is achieved. Refer to => [ Front Axle, Lifting to Curb Weight Position ] Front Axle, Lifting to Curb Weight Position.

- Fasten the coupling rod.

Vehicles with an Air Spring Shock Absorber

- Fill the rear air spring shock absorber using the (VAS 5051B).

Continuation for Both Vehicles

- Install the brake caliper and brake disc.

- Loosen the 12-point nut for the drive axle on the wheel hub. Refer to => [ Drive Axle Twelve-Point Nut, Loosening and Tightening ] Procedures.

- Install the wheel and tighten the wheel bolts. Refer to => [ Wheel Bolt Torque Specification ] [1][2]Specifications.

Tightening Specification