I have been out on my 03' Vstar 1100 twice this year and both times the rear brakes have just locked up. I could start to feel the drag while riding and smell overheated pads. Once I pull over and stomp on the brake lever a few times, they seem to release. However, the last time I was out and at highway speed, they completely locked up and I went into a 20 yard power skid!!! I was hoping that it was just because the bike sat over the winter and maybe the caliper was just a little sticky but that last time scared the s$%t out of me. I searched this problem in the forum but haven't been able to find any exact situations such as this. Any suggestions as to what is causing this would be greatly appreciated.