Wheel Bearing Unit

Wheel Bearing Unit

Special tools, testers and auxiliary items required

• Torque wrench (V.A.G 1332)

Removing

- Loosen driveshaft bolt to wheel hub:

• Twelve-point bolt with ribs, refer to => [ Twelve-Point Bolt with Ribs, Loosening and Tightening, Driveshaft Threaded Connection ] Twelve-Point Bolt with Ribs, Loosening and Tightening, Driveshaft Threaded Connection

• Twelve-point bolt without ribs, refer to => [ Twelve-Point Bolt without Ribs, Loosening and Tightening, Driveshaft Threaded Connection ] Twelve-Point Bolt without Ribs, Loosening and Tightening, Driveshaft Threaded Connection

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

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

The driveshaft bolt may be loosened maximum 90° when the vehicle is standing on its wheels.

Vehicles without a driveshaft 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 driveshaft.

• Tighten the outer joint to 120 Nm.

- Remove the wheel.

- Remove brake caliper with brake carrier and hang on body using wire.

- Remove ABS wheel speed sensor.

- Remove disc brake.

- Remove the nuts - arrows - on left and right side of vehicle.






- Remove the control arm from the ball joint.

- Pull the driveshaft out of the wheel hub.

- Remove the screws - arrows -.






- Remove wheel bearing unit from wheel bearing housing.

Installing

Install in reverse order of removal.

- Install brake caliper.

- Tighten driveshaft bolt to wheel hub:

• Twelve-point bolt with ribs, refer to => [ Twelve-Point Bolt with Ribs, Loosening and Tightening, Driveshaft Threaded Connection ] Twelve-Point Bolt with Ribs, Loosening and Tightening, Driveshaft Threaded Connection

• Twelve-point bolt without ribs, refer to => [ Twelve-Point Bolt without Ribs, Loosening and Tightening, Driveshaft Threaded Connection ] Twelve-Point Bolt without Ribs, Loosening and Tightening, Driveshaft Threaded Connection

Vehicle must not rest on wheels when doing so.

With screw loosened, wheel bearing can be damaged by the vehicle weight.

Differences between a twelve-point bolt with ribs and a twelve-point bolt without ribs






The contact surfaces - arrow A - and - arrow B - are different on the two-point bolts.

I Twelve-Point Bolt with Ribs - arrow A -
II Twelve-Point Bolt without Ribs - arrow B -

- Install ABS wheel speed sensor.

- Install the wheel and tighten the wheel bolts. Refer to => [ Tightening Specification for Mounting Wheels ] Specifications.

Tightening Specifications