How do Wheel Hubs Work?
The wheel hub assembly holds the brake rotor, which typically slips over the lug studs, and forms the attachment point for the wheel. There is a bearing or bearing race mounted inside the wheel hub. The front wheel hub creates a fixed attachment point for the wheel to roll and pivot as you drive the vehicle. The rear wheel hub stays largely fixed in place while it pivots on the rest of the suspension.
Wheel hubs rarely break or wear out, but the bearings inside will eventually need to be replaced as they age and become worn. Stuck fasteners often make wheel hubs moderately difficult to remove and replace.