For the most part, outer wheel bearing noises can be verified by steering left and right while driving, rocking the vehicle to move the weight more left and right. Bearing noise that is noticeably worse in one direction indicates the opposite outer wheel bearing is at fault. In other words, noise on a left turn indicates a problem in the right side bearing and vice versa.

Symptoms of a faulty wheel bearing include a growling or metal-to-metal noise from one of the wheels while the vehicle is moving, wandering steering, or a seized wheel.

A classic symptom of a bad wheel bearing is noise, so if a customer says his vehicle is making "funny" noises when driving (squeaks, chirps, squeals, moans, etc.), or he hears a grinding noise when turning, it may indicate a bad wheel bearing. Other symptoms include steering wander or possibly a pull to one side when braking.

To check a wheel bearing, grasp the tire at the 12 and 6 o’clock positions and attempt to rock the tire. If you feel any play, the bearings are loose and need to be replaced. Also, rotate the tire by hand. Any roughness or noise from the bearings would also tell you the bearings are worn or damaged and need to be replaced.

If one wheel bearing has failed, pay close attention to all of the other hubs on the vehicle, too, especially if the vehicle has a lot of miles on it. Chances are some of the other bearings may also be nearing the end of their journey.