Just have the brake re-adjusted. I had an issue with mine where someone adjusted it too tight and it was dragging. My hand brake and rotor was subsequently damaged.
'06 Arctic Metallic 325i | Sport Package | 6MT | Dinan Stage III suspension | Dinan exhaust | 330i manifold swap! Click here!
| Active Autowerke tune | 135i Brake Calipers | Deiselboost caliper brackets | E46 M3 front rotors