A very bad grinding noise was coming from the drivers side rear wheel. I removed the tire and noticed that the brake pads were fine but the rotor was worn badly but only the top half. When I put the tire back on but had the car jacked up, I grabed the tire and could wobble it very, very bad. Almost felt like I could have pulled it off. Could the rear bearings cause this or is it something else like hub asembly? Please help. I guess the wheel is wobbling so bad that the rotor is kicked out and just gringing away on something. Thanks for any advice you have to offer. I dont know much about this sort of thing at all but the car is not driveable to even get it to a shop.