I just had my rear brakes changed (06 VW Jetta), and one driver's side rotor replaced as well. When I drove it today (for the first time since), it was making a tapping sound in the rear end on residential streets and then when I got on the highway it got so loud that it sounded like a helicopter. My stearing wheel also started vibrating at about 60mph. The noise and vibration stops completely when I put the brakes on to slow down, so I think it's brake/tire related. Any suggestions?