OK, I dont know if this is a total rookie question but I just got back from a ride on my 05' DWG and I checked my tire pressure. When I took my valve cap off my rear tire I noticed my rotor was warm, almost HOT. My rear wheel also seemed to have a lot of "break dust". The pads look to be at around 50% Any input, is this normal? my front wasnt as warm as the rear either.