Rear wheel hub???

[Dfuse]

How do i know if it needs to be changed? My car is starting to make this loud groaning noise when im driving and its coming from the back.

 

[Billy.]

lift the car, spin the wheels with your hand. if you hear grinding you might have a bad bearing. check to make sure your brake pads arent biting down b/c to an untrained ear it might sound like a bearing. the wheel should rotate freely and with little noise

 

[Kensai]

Disk or drums? Most likely the bearing but it might also be loose brake hardware..