I took my RM around the block (without wearing a helmet) and I heard something that I have apparently been missing as I almost always have a helmet on. There was a hissing/rubbing sound that made me think of the brake. So as I made my way home I was deliberate to use only the front brake. The rear brake rotor was very hot to the touch when I parked, the front only warm. So I think the back brake is rubbing and probably has been - is there some other way to confirm or is there a way to simply adjust? Or is this needing the dealer service?