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wheel bearings

Although wheel bearings are engineered to last 150,000 miles or more, the constant load does take a toll on the bearings, the grease and on the seals. If a wheel bearing fails prematurely, it is as a result of misadjustment, contamination or loss of grease.

Once a seal starts to leak, the bearings are in trouble. A damaged grease seal can allow grease to leak out of the bearings, therefore dirt and water can then enter the bearing cavity.

If the seals on sealed bearing assemblies fail, the seals cannot be replaced separately, the entire hub assembly needs to be replaced. Yet, in some older vehicles, a bad seal can be replaced with a new one to extend the life of the bearings.

Water is the worst thing for bearings as it causes it to rust and it contaminates the grease. The majority of vehicles’ wheel bearings seals are not designed to keep out water that is exerting pressure against the seal.

Therefore any vehicle that has been driven through hub-deep water should have its wheel bearing cleaned and repacked with fresh grease. Obviously with sealed wheel bearing assemblies, this won’t be possible, so the only thing to do is check for noise and play.

The first symptom of wheel bearing trouble is noise. There is usually a rumbling, growling, chirping or cyclic noise of some kind that will come from the vicinity of the wheels.

This is a good indication that trouble is now brewing and therefore immediate attention is needed. If you ignore a noisy wheel bearing it could suddenly fail. This could be fatal as the vehicle could lose a wheel while driving.

Wheel bearing noise doesn’t change with when accelerating or decelerating but it may change when turning, or it could even become louder or even disappear at certain speeds. But don’t get confused with the noise a bad outer CV joint makes, as it only makes a noise when turning.

Bearing play can often allow the steering to wander. This is often mistaken for worn steering components or even the wheel alignment being out.

Wheel bearings that are not factory sealed do require periodic maintenance. They should be cleaned, inspected and greased at about every 30,000 miles or according to the manufacturer’s recommendations.
 

21 Comments to wheel bearings:

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