You all might remember that a few months ago I asked about a brake problem I had where the front right brake would sometimes bind or lock up. Happened usually when I was in carpool line at my child's school. I took the truck to the dealer who said my rotor was warped. He replaced it for about $650. The problem is back. Why would the rotor warp? Could there be another underlying problem that would lead to recurring warped rotors? I hesitate to take the truck back to the dealer because he is far away and, most importantly, I don't trust him. I want to sell the truck (got a newer one) but not without resolving this issue. Thanks.