I had the same problem with my 1997 F150, after replacing the rotors, calipers, pads, brake booster, and master cylinder my brakes were still grabbing and not releasing. It would change in weather, if it was warm they felt almost sticky. I finally came to the conclusion that it was the Brake Hoses that came off brake calipers. I guess they corrode inside of the short run of hose that goes off the brake lines to the caliper. When I replaced them, that solved it, so $40.00 for two hoses solved the problem. I would check in to them. Good Luck!