I have a 2003 Road King and have noticed a sound coming from the rear of the bike after I've been riding for about 25-30 minutes. It sounds like something might be rubbing against the brake disc as the sound slows down as I slow down and then goes away when I get under 5 mph. I touched the brake disc after riding and it was extremely hot. Don't think it should be so that is leading me to believe something is rubbing against it. Any suggestions?