Obvious Signs:
* Wobble or vibration in the steering wheel: This is a classic sign of a failing wheel bearing within the hub assembly. The vibration will often increase with speed.
* Loud humming, growling, or grinding noise: This noise typically gets louder as you accelerate or turn. It often originates from the affected wheel and might change pitch with speed.
* Wheel bearing play: If you can grab the wheel at the top and bottom and noticeably feel movement or play (a knocking sensation) that indicates a severely worn bearing. (Note: this is not recommended unless you are experienced, as forcing the wheel can be dangerous.)
* Visible damage: Look for cracks, damage to the hub itself, or excessive rust that could compromise its structural integrity.
* Leaking grease or fluid: The wheel hub's bearing is sealed with grease. Seeping grease usually means the seal is broken, and the bearing is failing.
* ABS or traction control warning light: Although not always indicative of a failed hub, these lights can illuminate due to sensor issues associated with the wheel speed sensor, which is often part of the hub assembly.
Subtle Signs (requiring more attention):
* Pulling or wandering: A slight pull to one side while driving could indicate a worn hub bearing, though this is less definitive than other symptoms.
* Uneven tire wear: While this isn't directly a sign of hub failure, it *could* be a symptom of a problem that causes the wheel not to be aligned or rotate smoothly, potentially indicating an issue with the hub assembly.
Important Considerations:
* Professional Diagnosis: It's best to have a mechanic diagnose wheel hub problems. They have the tools and experience to accurately assess the condition of the hub assembly.
* Safety: Driving with a failing wheel hub is dangerous. A complete bearing failure could lead to loss of control of the vehicle.
* Cost: Replacing a wheel hub assembly can be expensive, depending on the vehicle and labor costs. Consider the cost of repair versus potential damage from further driving.
If you suspect a problem with your wheel hub assembly, don't ignore it. Get it checked by a qualified mechanic immediately.
