I've got a question for the experts here. My local Volvo shop recommended a front brake job on my wife's XC70. They say that there's 2mm of pad left, and they quoted me almost $500 for the job, which included new rotors. When I quizzed them on why they didn't turn the rotors instead of going with new ones, I was told that Volvo makes the rotors too thin and if turned, the old ones would warp. Is this true, or am I being played for new rotors?