'96 front brakes
I had a '96 2500 4x4 Auto for about a year and a half. I had to replace the front brake pads every 12K miles, and the rotors every third set of pads.
The front brakes on the early 2nd Gen trucks were inadequate. I could stand on the brake pedal and not even get close to locking up the brakes. Or get close to getting the anitlock to start cycling.
The first time I put a a trailer behind it, I scared myself. I came within inches of rear ending someone who pulled out in front of me: trailer brakes locked, truck pedal on the floor and gradually slowed down.
When I complained about the dangerous brakes, the dealer just adjusted the rear shoes, this helped, but not enough.
So: your brakes are inadequate, the rotors wear very fast, when they are thin it is easy to overheat them and warp them. The other problem is irregular rust buildup on the disc surface. This happens while the truck sits overnight in high humidity or heavy dew.
So replace your discs, keep the rear shoes adjusted up, and if you do a lot of start and stop driving, slip the trans into neutral when stopping so the brakes don't have to overcome the residual push from the trans. . Using this technique, I managed to get 16K out of my last set of brake pads before I got rid of that truck.
All my later trucks had much better brakes, and my 2001. 5 has the best with four wheel discs.
Greg L The Noise Nazi