I have replaced the rotors (and pads) on my vehicle at 57K and again at 76K (chalked that up to incompetent/sleazy repairer. Now at 88k all the symptoms of rotors again, not the rears because I did those thinking it was the problem. Someone (?) offered that perhaps there is a problem with the front calipers, although with new rotors X2 they worked just fine. Ideas?