I had new rotors and drums put on my '97 Tahoe 4x4 by Midas and within a short time had warping all around. Midas turned the front rotors and replaced the rear rotors a 2nd time which needed turning even as new. Having the problem again with less than 10,000 miles on the brakes. Never had this issue with GM service. Is Midas is using cheap parts or the wrong brake pads/shoes leading to this problem or is something else possibly going on?