Wheel Bearing Overview

Wheel Bearing Overview






1 Cover Plate

2 Wheel Hub with Wheel Bearing

• Removing and installing, refer to => [ Wheel Bearing Unit ] Wheel Bearing Unit.

• Sensor ring for ABS is installed in wheel hub.

• Various versions. Allocation, refer to the Electronic Parts Catalog (ETKA).

3 Bolt

• Various versions. Allocation, refer to the Electronic Parts Catalog (ETKA).


• There are 2 types of twelve-point bolts, with and without ribs. Distinguishing characteristic, refer to => [ Differences Between a Twelve-Point Bolt with Ribs and a Twelve-Point Bolt without Ribs ].

• When installing a twelve-point bolt, always check what type of twelve-point bolt is to be used.

• Use the correct tightening specification for the specific bolt.

• The tightening specification for a twelve-point bolt with ribs is 70 Nm + 90° turn. For loosening and tightening specifications, refer to => [ Drive Axle Twelve-Point Bolt with Ribs, Loosening and Tightening ] Drive Axle Twelve-Point Bolt with Ribs, Loosening and Tightening.

• The tightening specification for a twelve-point bolt without ribs is 200 Nm + 180° turn. For loosening and tightening specifications, refer to => [ Drive Axle Twelve-Point Bolt with Ribs, Loosening and Tightening ] Drive Axle Twelve-Point Bolt with Ribs, Loosening and Tightening.

• Always replace if removed.

4 Bolt

• 12 Nm

5 Bolt

• 8 Nm

6 Left Front ABS Wheel Speed Sensor (G47) / Right Front ABS Wheel Speed Sensor (G45)

• Before inserting wheel speed sensor, clean inner surface of bore hole and coat with securing grease (G 000 650).

7 Bolt

• 70 Nm + 90° turn

• Always replace if removed.

• Vehicle must not be standing on its wheels when loosening or tightening.

8 Drive Axle

• Removing and installing, refer to => [ Drive Axle with CV Joint ] Drive Axle with CV Joint.

9 Wheel Bearing Housing

• Removing and installing, refer to => [ Wheel Bearing Housing ] Wheel Bearing Housing.

• With integrated brake carrier.

• If the wheel bearing housing must be replaced, alignment must be checked afterwards. Refer to => [ Wheel Alignment, with Torsion Beam Rear Suspension ] Wheel Alignment, with Torsion Beam Rear Suspension or => [ Wheel Alignment, Vehicles with Multi-Link Rear Suspension ] Wheel Alignment, Vehicles with Multi-Link Rear Suspension.

• Various versions. Allocation, refer to the Electronic Parts Catalog (ETKA).

10 Wheel Bearing Housing

• Removing and installing, refer to => [ Wheel Bearing Housing ] Wheel Bearing Housing.

• With bolted brake carrier.

• If the wheel bearing housing must be replaced, alignment must be checked afterwards. Refer to => [ Wheel Alignment, with Torsion Beam Rear Suspension ] Wheel Alignment, with Torsion Beam Rear Suspension or => [ Wheel Alignment, Vehicles with Multi-Link Rear Suspension ] Wheel Alignment, Vehicles with Multi-Link Rear Suspension.

• Various versions. Allocation, refer to the Electronic Parts Catalog (ETKA).

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 -