I've been driving for 40 years and today for the first time I have been told that my car needs new rear discs. Even more surprising to me is that it is a 2008 Honda Accord with 28,000 miles on the clock. The dealer service manager suggested that a caliper had overheated and damaged the disc. When pressed he said that this could have been due to grit from the hard winter or "any one of a number of factors" and that "this is not a warranty repair". I do know that harder pads used nowadays can cause disc wear, but my last 5 cars (which had all been dealer demonstrators) have all gone above 90k miles without needing new discs and this does seem exceptional.