Wheel bearings are used in both the front wheels and the back wheels. Each individual wheel has their own wheel bearing and it is possible for just one of those bearings to wear out while the others are still in good condition.

That is why you won’t necessarily have to replace all of your wheel bearings if only one is worn out. Many (dishonest) mechanics will tell you that all need to be replaced or both on the same axle. This is usually not necessary.
.
.
Continue Reading here
.
.
.