I've read plenty that "warped rotors" are most often actually rotors that have not had the pads bedded properly. I found this to be true in my '97 - the PO had installed new rotors, calipers and pads. They pulsed badly after a few hundred miles. He tried new pads; no go. He replaced rotors; same thing after a few hundred miles. Swears he knows how to bed pads. There was minimal pulsing when I bought it. It got worse rapidly. I found a method of "rebedding" and it worked like a champ. A few hundred miles later...pulsing. Apparently, the deposits that the pads can leave on the rotor during bedding can become cement-like and impossible to fully remove, so rebedding simply makes the matter worse after a while.
As an aside, NEVER let your brakes get really hot and then hold them at a stop. The heat can cause pad transfer that is irreversible.
Thoughts?