Hi I have a faint noise on the front wheels for every wheel turn like it were a stone stuck in the tire or something. I took the nearside wheel off and notice the brake disc wobbles slightly. How is the disc attached to the hub because the part where the drive shaft attaches also moves and is loose. When I put the wheel back on and tightened nuts the wheel still moved slightly which I imagined should not be the case. Is this due to bearing failure? Do I need a new hub?? Thanks for any answers.