Both the surface of the rollers and the race are precision machined to tight tolerances and highly polished to allow the rollers to pass easily over the race with the addition of bearing grease for lubrication and cooling. A wheel bearing will usually fail due to pitting or small damage on the surface of the rollers or the bearing race. No matter what type of bearing you have, bad wheel bearing symptoms are the same. How do You Know if You Have a Bad Wheel Bearing? The downside is that the bearings cannot be serviced, cleaned or re-greased to once they are worn out the whole bearing must be discarded and a new bearing assembly installed.

The benefit is that it’s very difficult for contamination to get into the bearing to cause accelerated wear. These unit bearings are sealed units that cannot be serviced. Today, most vehicles use a unit bearing pressed or bolted onto the hub or knuckle. On classic cars, wheel bearings were a set of tapered roller bearings on a non-drive wheel or a straight bearing supporting an axle of the drive wheel. It’s important to regularly check your transmission fluid level find out if you have a leak in your transmission so you can get the problem fixed before any damage occurs. A similar noise can come from worn bearings in your transmission or even a low transmission fluid level. A bad wheel bearing sound is usually a loud hum coming from that wheel sort of like loud road noise from bad tires.

Wheel bearing wear and tear can happen for a variety of reasons we’ll look at in a minute. Since a wheel bearing has to accomplish all this for hundreds of thousands of miles, it’s not surprising that they wear out occasionally. What Happens When a Wheel Bearing Goes Out? Bearings are used in all sorts of things we use every day so you might be interested to learn about more uses for bearings ! Unlike your engine bearings, your wheel bearings don’t have a constant supply of oil lubricating and cooling them, they have to be self-sufficient and also be sealed tight enough to keep road dust and water out of them. Not only does a wheel bearing have to support the entire weight of your vehicle while it is traveling over rough roads, potholes and maybe the occasional curb, they also have to take the lateral forces of corners you take and have to do all that while allowing your wheel to spin at thousands of revolutions per minute. The hub holds the lug bolts that you use to bolt the tire onto the wheel. Wheel bearings ride on a metal axle shaft and fits tightly inside the hub, a hollow piece of metal at the center of the wheel. But first thing’s first, what is a wheel bearing? A wheel bearing is a set of small steel balls which are held together in a metal ring called a race and help a wheel spin by reducing friction. The wheel bearings in your car take a lot of abuse and, not surprisingly, why we get a lot of questions about wheel bearing noise and signs of bad bearings.

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