Nothing’s better than listening to your favorite song while cruising down the road. But if you have the tunes cranked full blast, as I often do, you may not hear the droning hum of a faulty wheel hub assembly. And that could be dangerous.
Take, for example, my recent encounter with a well-worn Nissan Altima. The owner brought the car in for an unrelated check engine light. But when the vehicle was test-driven, the growl of a faulty wheel hub assembly was apparent. Clearly, the noise went unheard by the customer, though the nagging glow of the check engine light did not.
Back at the shop, the technician set forth checking the wheel hub assemblies one at a time. He quickly found the culprit at the left rear. The wheel bearing portion of the assembly was finished and the hub was barely hanging on. Had the vehicle been driven much further, the wheel and tire could potentially have fallen off.
The wheel hub, which is usually integrated with a wheel bearing into a single assembly, can cause several problems. Over the years, I’ve found some of the most common symptoms to be:
The most common sign of a faulty wheel hub assembly is a rotational growling or humming noise while driving. Damage to the bearing portion of the component causes the unnerving racket.
In some instances, an extremely worn wheel hub assembly can cause lateral movement in the corresponding wheel and tire, resulting in vibration while driving.
Your car’s brake rotors or drums mount to (or are integrated with) the wheel hub. Because of this, a warped, distorted, or loose wheel hub assembly can cause a pulsation when braking.
A faulty wheel hub assembly can pull the corresponding wheel out of alignment, leading to abnormal tire wear.
On some vehicles, the antilock braking system (ABS) wheel speed sensor and reluctor disc are integrated into the wheel hub assembly. As such, a problem with the hub assembly can trigger the ABS warning light and, possibly, the traction control warning light as well.