Wheel Bearing Unit

Wheel Bearing Unit

Special tools, testers and auxiliary items required

• Torque Wrench 40-200 Nm (V.A.G 1332)

Removing

• Twelve-point bolt with ribs, refer to => [ Drive Axle Twelve-Point Bolt with Ribs, Loosening and Tightening ] Drive Axle Twelve-Point Bolt with Ribs, Loosening and Tightening.

• Twelve-point bolt without ribs, refer to => [ Drive Axle Twelve-Point Bolt without Ribs, Loosening and Tightening ] Drive Axle Twelve-Point Bolt without Ribs, Loosening and Tightening.


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 drive axle bolt may be loosened maximum 90° when the vehicle is standing 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 120 Nm.

- Loosen the wheel bolts.

- Raise the vehicle.

- Remove the wheel.

- Remove brake caliper and engage on body with wire.

- Disconnect the connector - 1 - from the ABS speed sensor.






- Remove the bolt - arrow - and the ABS speed sensor - 1 -.






- Remove the brake rotor - 1 - - arrow -.






- Remove the cover plate - 1 - from the wheel bearing housing - arrow -.






Only Vehicles with a Drive Axle VL 100

- Press the drive axle out of the hub as far as possible (in direction of transmission).

- Remove the screws - arrows -.






- Remove the wheel bearing unit - 1 - from the wheel bearing housing.

Continuation for All Vehicles

- Remove the nuts - arrows -.






- Remove the control arm from the ball joint.

- Pull the drive axle out of the wheel hub.

- Remove the bolts - arrows -.






- Remove the wheel bearing unit - 1 - from the wheel bearing housing.

Installing

Install in reverse order of removal. Note the following:

- Install brake caliper.

- Tighten drive axle bolt to wheel hub:

• Twelve-point bolt with ribs, refer to => [ Drive Axle Twelve-Point Bolt with Ribs, Loosening and Tightening ] Drive Axle Twelve-Point Bolt with Ribs, Loosening and Tightening.

• Twelve-point bolt without ribs, refer to => [ Drive Axle Twelve-Point Bolt without Ribs, Loosening and Tightening ] Drive Axle Twelve-Point Bolt without Ribs, Loosening and Tightening.


Vehicle must not rest on wheels when doing so.

With bolt loosened, wheel bearing can be damaged by vehicle's own 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 front wheel and tighten the bolts. Refer to => [ Wheel Bolt Tightening Specification ] [1][2]Specifications.

Tightening Specifications