So I was towing my camper with my 2006 6.0 F350 when I had to get on the brakes and suddenly it pulled hard to the right. It did this the rest of the way to the campground, about 40 miles. Got out and checked and all the wheels were covered in brake dust BUT the front passenger was clean and caliper was cold which should have been the left caliper not working. Truck has all newer discs, pads, fluid and all stainless braided lines. Now I just got home and it stopped perfect the entire way. Thought the pins might have been seized but it shoulda been the left side. What should I look for and why did it start working fine?