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HUB / BEARING

DIAGNOSIS AND TESTING - WHEEL BEARING AND HUB
The wheel bearing is designed for the life of the vehicle and requires no type of periodic maintenance. The following procedure may be used for diagnosing the condition of the wheel bearing and hub.

With the wheel, disc brake caliper, and brake rotor removed, rotate the wheel hub. Any roughness or resistance to rotation may indicate dirt intrusion or a failed hub bearing. If the bearing exhibits any of these conditions during diagnosis, the hub bearing will require replacement. Do not attempt to disassemble the bearing for repair. If the wheel bearing is disassembled for any reason, it must be replaced.

Damaged bearing seals and the resulting excessive grease loss may also require bearing replacement. Moderate grease leakage from the bearing is considered normal and should not require replacement of the wheel bearing.

To diagnose a bent hub, Refer to ROTORS - DIAGNOSIS AND TESTING for the procedure on measuring hub runout.