Sealed vs. Open Bearings There are two broad categories of wheel bearings – Sealed or non-serviceable (maintenance free) wheel bearings and open (or shielded) bearings. Most European car manufacturers use sealed bearings, as do most front-wheel drive vehicles. In contrast, most rear-wheel drive cars use open bearings.

For instance, the bearing rollers might be driven into the race, causing a dimple or depression. Now, the wheel bearings will rotate unevenly, causing stress and friction, as well as wearing away at the structure and introducing debris into the system. Depending on the severity of the deformation caused by the impact, the process by which the wheel bearing goes bad can be gradual or very quick. This is typically, but not always, signified by noise heard while driving, as described above.

Being aware of and being on the lookout for signs of worn out or failing wheel bearings is a useful ability, so as to avoid continued driving with a bad wheel bearing and prevent additional damage to other suspension components. Knowing when your car’s wheel bearings should receive an inspection or maintenance and recognizing the signs that your wheel bearings might need replacement will save you considerable hassle and expense. In order to do all that, it’s necessary to understand how wheel bearings work and some of the signs of worn or failing bearings.

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And, of course, wheel bearings wear out over time due to simple wear and tear. While any of the above problems will hasten the decline of your bearings, driving for tens of thousands of miles will eventually wear your wheel bearings down and require either service or replacement, depending of the type of wheel bearing.

Wheel Bearing Service Depending on the type of wheel bearings your car has and the condition they’re in, there are a variety of service options to keep your car running properly. This can range from a wheel bearing repack maintenance to wheel bearing replacement.

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Open or shielded bearings, however, do require regular maintenance, both to clean out contamination from particles and other debris and to replenish lubrication grease that will naturally be lost over time from friction in the system. The advantages to open or shielded bearings are that they are less expensive, and also easier to work with if a problem does occur. Also, if maintained properly through regular wheel bearing repack service, open wheel bearings rarely go bad or need replacement.

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Causes and Signs of Failing Wheel Bearings Sealed bearings should be brought in for inspection every 30,000 miles or sooner if you hear any unusual noises. The typical wheel bearing noise is a rotational humming noise while you’re driving that typically varies with speed or when turning. Sealed bearings can typically last as long as 100,000 miles or more. But there are a number of events that can shorten the lifespan of your bearings.

At its most basic, a wheel bearing bears the weight of your car where the wheel meets the wheel hub and allows the wheel to turn freely. Without a wheel bearing, the turning of the wheel would produce an incredible amount of friction at the point where it joins the axle, leading very quickly to a worn out axle and hub.

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Another indication of bad wheel bearings can be a car whose handling feels loose. If your car doesn’t quite feel perfectly responsive, that may be a sign that your bearings are failing.

At its simplest form a wheel bearing consists of a set of spherical or cylindrical-shaped steel rollers encased in a metal frame. The frame is called a race, and it’s made up of two circular tracks in which the bearings are held snugly but allowed to rotate with the wheel’s motion. The interior of wheel bearings is heavily lubricated to assist in frictionless motion of the bearings.

Sealed bearings are a more closed-off system. The advantage of sealed bearings is that it’s more difficult for contaminants to be introduced into the interior of the wheel bearing. In addition, sealed bearings don’t have to receive periodic lubrication maintenance service. In short, sealed bearings are virtually maintenance free.

Wheel bearings are filled with a lubricant that’s crucial to proper bearing function. This lubricant isn’t designed to mix with water. If you drive through extremely high water in a flood or similar situation, you risk your bearing coming into contact with water, which will emulsify your wheel bearing lubricant.

Causes of Premature Wheel Bearing Failure One major cause of your bearings going bad prematurely is any kind of wheel crash or heavy impact like hitting a large pothole or curb at a bit of speed. In those instances, the majority of the force to the wheel goes directly to the wheel bearing and wheel hub structure, and it’s easy for that structure of the wheel bearing and hub to be compromised.

Chances are, you don’t think very much about your car’s wheel bearings. But wheel bearings provide an essential function within your car’s suspension and wheel system, and without them your car would stop rolling very quickly.

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If your vehicle has open or shielded wheel bearings, frequent maintenance is a must if you want to avoid the kinds of problems that will cause you to need new bearings. We suggest repacking open-type wheel bearings every 30,000 miles. With sealed bearings the need for regular maintenance pretty much only constitutes periodic inspection for unusual wear or poor bearing operation; but it’s still a good idea to have the sealed wheel bearings inspected at least every 30,000 miles to make sure you haven’t run into any problems.

If your wheel bearings are open or shielded, you may benefit from a wheel bearing repack, in which the bearings are removed, the individual parts are flushed out of any debris and the bearings are replaced with fresh lubricating grease. If your bearings are sealed, they are maintenance free. But if a sealed wheel bearing has gone bad, it’ll need to be replaced.

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Front and rear wheel bearings are different for many cars, meaning that your car’s bearings aren’t interchangeable front to rear.

Apr 9, 2024 — An easy check is to grab the tyre and shake the wheel vigorously side to side, if the wheel rocks, then it is highly likely that the bearing has failed.

Another cause of wheel bearing issues is driving on out-of-round or improperly installed tires. Driving on poorly balanced tires can cause damage not only to the wheel bearings but also to many other components of your suspension system.

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If it’s time for your wheel bearing maintenance service or wheel bearing inspection, give us a call or click here to make an appointment.

As with most automotive systems, the basic form of the wheel bearing gets a little bit more complicated and consists of various types, depending on year, make, or model of vehicle.

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Signs of Wheel Bearing Failure As mentioned above, the big key to detecting wheel bearing decline or failure is listening for noise. Bad wheel bearings will begin to make noise. At first, a bearing going bad may make a barely audible grinding or grating, and may make it only within certain speed thresholds. As the problem gets worse, the bearing noise will get more noticeable, and can be described as a humming or roaring type of sound.