A similar noise can come from worn bearings in your transmission or even a low transmission fluid level. 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. 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. Today, most vehicles use a unit bearing pressed or bolted onto the hub or knuckle. These unit bearings are sealed units that cannot be serviced.
The benefit is that it’s very difficult for contamination to get into the bearing to cause accelerated wear. 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. No matter what type of bearing you have, bad wheel bearing symptoms are the same. A wheel bearing will usually fail due to pitting or small damage on the surface of the rollers or the bearing race. 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. Over time the bearing will wear slightly, allowing microscopic pieces of metal into the grease. These microscopic pieces of metal, as well as any contamination that gets into the bearing, will wear away at the highly polished surfaces causing pitting and deformation.
Since so much weight is riding on your wheel bearings, and so much load is put on them in corners, even the smallest amount of surface damage to your bearing can cause a lot of noise like a growling or humming or in some cases a grinding noise. What Does Bad Wheel Bearing Noise Sound Like?ĭetermining if you’ve got a failed wheel bearing in your car can often be a difficult task.
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