A good grease can only meet expectations if it is used properly. Implementing proactive maintenance techniques to monitor lubrication can further enhance and optimize component operations.

A bad wheel bearing can cause a tire/wheel to move or glide unevenly or sluggishly. It can also cause your brakes to drag, pulling your vehicle to one side when you try to stop.

Because greases are prone to compatibility issues, you will want to ensure that the selected grease will not negatively interact with the grease already present in the wheel-end. Alternatively, a thorough cleaning of the component to remove any old grease will reduce the potential for compatibility issues.

But sealed wheel bearings are non-serviceable and should never be repaired, only replaced. Even if a pro suggests repairing a bearing, don’t let them. Trying to reuse a damaged wheel bearing can result in an accident and severe injury.

Wheel-end lubricants are used for hub assemblies in automotive applications, and most wheel ends are lubricated with grease. Hub assemblies typically utilize a rolling-element bearing, allowing the wheel to rotate freely. This bearing removes friction between moving parts and, in order for the bearing to function correctly, it must be properly lubricated. Additionally, periodically re-lubricating the bearing can extend the lifespan of the entire assembly. But for wheel-ends to be lubricated properly and last longer, they need the right grease for the job. In applications with a wide temperature variability for instance, a synthetic, heavy duty grease may be the right choice. In other scenarios, another option such as an NLGI GC-LB certified grease may serve you better.

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You can service or replace tapered wheel bearings yourself. Never reuse any wheel bearing that’s loose, worn, noisy or shows any signs of wear.

The right grease for wheel-end applications is one that can offer the same lubricating properties of an oil while also resisting the temperatures and heavy duty working conditions present. Greases that cannot resist these factors run the risk of grease bleeding. Because energy from brakes is often transferred to wheel-bearings, a grease that has experienced bleeding can quickly fail.

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According to Simes, a failing wheel bearing will likely produce a soft, faint vibration that’s felt before it’s heard. There may also be a vague rhythmic humming or droning sound that increases over time and with speed.

Automotive greases are placed into one of two categories: chassis grease and wheel bearing grease (some greases are fit for both categories and are labeled as dual-service). Chassis greases are further categorized as light duty (LA) or severe duty (LB); wheel bearing greases are categorized as mild duty (GA), moderate duty (GB), and severe duty (GC). Typically, regreasing frequency follows the pattern of rating: mild duty lubricants require less frequent regreases than do moderate duty lubes, and so on.

Joe Simes is an ASE and Toyota master technician. After 20 years in the industry, Simes recently became a Pennsylvania Department of Education certified automotive technology instructor at North Montco Technical Career Center in Lansdale, Pennsylvania.

You’ll hear clicking, cracking, grinding, snapping, or whining noises coming from your wheels or tires. They’ll increase when accelerating or turning.

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Read on to learn the most common bad wheel bearing symptoms, based on my experience (50 years in the industry) and that of Joe Simes, a National Institute for Automotive Service Excellence (ASE) certified and Toyota master technician. But first, a little background.

Grease Specifications Greases are graded by thickness using the National Lubricating Grease Institute (NLGI) consistency number, which is explained in more depth here. For wheel-end applications, greases will typically have an NLGI number ranging from one to three, with two being the most common.

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The average cost to replace a sealed wheel hub bearing is $350 per wheel. However, depending on the make and model, shop labor rate, the cost of the bearing itself and any additional damage, the total could exceed $1,000.

Simply stated, wheel bearings allow cars and trucks to run smoother and more efficiently by reducing friction and supporting vehicle weight. When they start to fail, you can usually tell.

Friction from a failing wheel bearing produces heat. After driving, without touching the tires or wheels, carefully walk around your vehicle and use a non-touch thermometer to measure if one is hotter than the others.

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Grease Selection Grease is typically preferred for wheel-end applications because, unlike oil, the thickness of grease allows it to stay in place within the component housing. There are some drawbacks to grease, though: it can be difficult to replace, and it is easy to overgrease, which can lead to machine failure.

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Tractor trailer wheel bearings may have different lubricant requirements. Oils are sometimes used or a No. 00 consistency grease with synthetic base oils and a higher viscosity might be recommended. Wheel-ends for construction and mining equipment could also have unique lubricant requirements. OEM lubricant recommendations should always be followed.

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Depending on the vehicle, you can save hundreds in labor replacing wheel bearings yourself. Most auto parts stores will lend you the specialty tools and equipment needed to replace a wheel bearing.

NOTE: Whether you DIY or your mechanic replaces the bearing, always install a new axle hub nut. Most hub nuts are prevailing torque fasteners, used on critical components (like securing axle shafts to hub bearings) where a loose nut could lead to disastrous consequences.

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Unlike unbalanced tires, shaking caused by a bad wheel bearing should be obvious from the side of the car where the bearing is failing.

On modern front- and four-wheel drive cars, wheel bearings are a set of permanently sealed, precisely machined steel ball or straight roller bearings. The balls, or rollers, are encased in a “cage” that supports the bearings, allowing them to rotate freely.

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On many vehicles, the ABS sensor is built into the wheel bearing, or it’s externally mounted adjacent to the spinning part of the bearing where the sensor measures vehicle speed. Damaged from a wobbly wheel bearing, the sensor will send erratic readings to the vehicle’s computer, illuminating the ABS light.

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The cage and rollers are held together inside a hardened metal ring called a “race.” The seal keeps grease in and damaging water and debris out. Wheel bearings are installed inside, and secured to, the suspension, either by press fit, bolts or a snap-ring. Once mounted, the wheel bearing rides on the axle shaft, allowing the tire/wheel to spin effortlessly.

Other Considerations A high-quality grease is always preferable, but it must be cared for properly. Heavy duty greases can, along with other factors like maintaining the oil level, regreasing at the correct intervals, and routinely monitoring components for signs of failure, allow wheel ends to meet and even exceed their expected lifespan.

Absolutely not. It’s crucial to get bad wheel bearings diagnosed and replaced ASAP. If not, you could lose a wheel or get in an accident.