These noises are normally associated with tire, electrical or drivetrain components. If bearing-related, the noise or vibration is present when driving in a straight line, but intensifies when turning the steering wheel slightly to the left or right. Typically, the side opposite the rumbling is the defective side.

Squealing, Growling ... The typical sounds of worn-out wheel bearings are squealing and/or growling. The sound intensifies as vehicle speed increases. Try to ...

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Diagnosing car troubles by sound alone is an inexact science, but you should not ignore new or unusual car noises. According to an often-quoted study from Braxton Research, 51% of wheel bearing problems are found because of noise (24% are found during a brake job and 19% during an alignment).

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This can indicate a worn or damaged outer CV-joint. However, it also can be related to excessive bearing endplay, usually associated with inadequate clamping. This noise is typically heard when cornering or making sharp turns.

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This can signal excessive play in the CV-joints or U-joints. It also can be caused by excessive backlash in the differential gears. This is not generally associated with bearings and is normally heard either when shifting from changing directions, such as from forward to reverse or transitioning from accelerating to coasting.

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This is normally indicative of a defective calliper or equalizer, but it also can be a sign of worn brakes or rotors. However, severe looseness related to a bearing can also cause excessive run out, which may cause the brakes to pulsate or pull. The most common cause is a warped rotor due to the calliper not retracting.

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This is generally associated with a damaged or worn tire, wheel or suspension component or severe chassis misalignment. When related to the hub or bearing, this normally indicates the loss of clamp or a bearing with extreme mechanical damage. It also can occur when lug nuts are not properly torqued.

Most wheel bearings are hardened steel and can withstand a lot of abuse. Its two worst enemies are heat and water. Heat caused by lack of lubrication can destroy a wheel bearing. Water that penetrates a sealed bearing will also destroy it.

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Having said that, although noises from bad hub assemblies and/or wheel bearings come from the area of your wheels, not all strange sounds from the area of your wheels is assembly- or bearing-related. They could indicate a problem with your brakes or CV joints. And if the noise comes and goes with the application of your brakes, the problem is more likely brake-related.

If you really want to know whether your noise is a bearing noise and you can get the car up on a lift, you can use an improvised stethoscope (actually a big screwdriver) to listen to the sound and find out where it’s coming from. Have someone in the vehicle start it and run it at about 40 mph. Using a long screwdriver or stethoscope, rest it on the hub near each wheel bearing. Careful! Don’t let the tool touch a moving part, or it could fly up and hit you. Listen through the handle of the screwdriver (or through the stethoscope) for the noise, and you will be able to determine which bearing is bad.

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This is normally associated with worn or damaged suspension components or tires that are out-of-balance or out-of-round. It is not normally indicative of hub or bearing damage.

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This is normally indicative of a bad calliper and/or a bad equalizer, which is not bearing-related. Severe looseness related to a worn or damaged bearing can cause excessive run out, which can cause uneven wear on the brake pads and/or rotor. The most common cause is a warped rotor due to the calliper not retracting.

Typically, this means there is mechanical damage in a wheel-end system. Related to a bearing, it means a loss of integrity such as roller or raceway damage. The noise is normally heard when turning or when there is a shift in load.

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Most wheel bearings manufactured today are sealed. They come from the factory pressed together as an assembly: front race, bearing set, centre race, bearing set, and outer race, with seals on both the front and rear. Seals protect bearings from the elements, water, and debris, and they also seal in the high-temperature grease the bearing needs. When a seal is broken or damaged, the wheel bearing will fail and start making noise.

There are two types of bearings: hub and wheel. Both employ the same physical characteristics of a bearing in that they house bearing spheres that are lubricated for spinning to allow the wheel to rotate. A major difference between the two is how they are assembled. Wheel bearings can be taken apart, lubricated and reassembled to be used again. Hub bearings are pre-packed at the manufacturer’s factory and are sold and installed as a complete unit. These cannot be taken apart for re-lubrication, but must be replaced.

There are many causes of abnormal tire wear. The most common are worn or damaged suspension components, misalignment, improper inflation or tire selection. While extreme bearing wear or looseness can cause abnormal tire wear, it is typically related to other failure modes.

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In extreme cases, internal and external sensors can be damaged from excessive movement caused by too much end-play. This indicates a lack or loss of bearing clamp. This normally results from severe mechanical break up or damage. (Additionally, in designs where the sensor is mounted externally, sensor damage can result from corrosion, stones and other hazards.)