Buddy of mine at work just changed out his front brake pads. After a few stops the brakes begin to squeal really loud, the antilock light comes on and he can smell that they are getting quite hot. He had no brake issues at all before changing the pads. He just thought he would change them out to stay ahead of the game. Any thoughts?

92 Extended Cab 4x4, 3.0 5-Speed Scratched, Dented and Rusted.