Originally Posted by Walt
Since it has worn a grove in the rotor it is probably imbedded in the pad now. You could try flushing it out with a pressure washer or air compressor but I bet you would have to dig it out of the pad, which would require taking it apart. If you don't want to do it you should probably have the dealer take a look. How bad is the groove?
The groove isn't too bad yet... just a silver streak. I just went and got some Brakleen and sprayed the crap out of the brake caliper/disc/pads through the wheel spokes. Now it's perfectly quiet and works as it should. However, I'm going to keep a close eye on it in case I need to take off the caliper and fish out some debris. Maybe it's a sign for me to get a BBK.