I recently started getting this grinding sound when I back up on my 2003 KJ Sport. i took it into the workshop to get looked at and the guy told me that the rotors and brake pads were shot and would have to be replaced. I was underthe impression that the rotors can be tooled down at least the first time and eventually have to be replaced. He told me that the rotors on the KJ have can not be tooled down since they are made of composites. Is that true? I thought that composite rotors only come in high performance sports cars. Could someone please shed some light on this issue. Thanks