tires and brakes on my four winds chevy 3500 chassis

If I remember right if you are replacing the rotors you have to take off the caliper bracket and I thing that it torques at 225#'s. I had a heck of a time getting the bolt loose. After I got it off I could see that there was some kind of locktite type material on the threads. If I were to do it again I would carefully apply some heat to the bolts and then replace them. When I reinstalled them I put some red locktite on the threads. I think that the pads only torqued at 80#'s.