ok, so after replacing the brake pads on the rear end of my truck, the pads are severely overheating. in a 2 mile run the rotors get so hot you can smell burning brakes and a few more miles and you can hear the wheels cooking. what is causing this? do i need to get a new caliper? it is only the the left rear side, the right rear side is cooling normally. i am afraid to drive it until it gets fixed, but i'm soon getting a new truck, and don't want to pour money into this one.