Rear Wheel Bearings — Checking and Replacing (Opel Astra G)

1. Raise the rear of the vehicle and place it on stands, remove the wheels.

2. Remove the brake drums (or discs).

3. Check the axial and radial clearance of the hub using a dial indicator or a ruler and a set of feeler gauges. Set the indicator to zero along the outer edge of the hub flange. To measure the axial clearance, place the indicator leg opposite the surface of the hub that is adjacent to the drum or disc. To measure the radial clearance, place the indicator leg strictly along the radius on the outer edge of the hub.

By slowly turning the hub, determine the maximum indicator reading, which is equal to the runout value. If the runout exceeds the norm, replace the hub and bracket.

4. Check the amount of tilt (inclination) of the bearing. To do this, secure a rigid ruler to the hub with 2 wheel bolts (polished metal bar), install the indicator leg on the hub surface and, by shaking the hub by the ruler, determine the indicator reading. If the skew exceeds the norm, replace the hub and bracket.

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