My Brakes have been getting hot, even to the point of smoking since I bought the truck 5 years ago. Over time I have changed the rotors twice pads three times, flushed the system, adjust the rears often and just replaced the calipers. I pull 9000 pounds in stop and go traffic and the trailer has brakes on all four axles. The petal is hard sometimes. I am frustrated. When I pull with a F 250 this does not happen. Any help would be greatly appreciated. Thanks