The service consultant at my Mercedes dealer said he double checked but they had to replace the rotors of my 2001 ML320 with 56,000 miles. I told him that the rotors of all of my other cars were never replaced but routinely resurfaced by other dealers. I told him that the brake handling felt and sounded just fine. He said that the dealership replaced the rotor because resurfacing the ML320 rotor is a health hazard. I was able to get 3 out of the 4 rotors. The rotors don't look as bad as the rotors of my others cars. I hate to think that my dealer made a mistake but with a $1,200 front/rear brakes plus rotors I feel like I was born with the mark of a sailboat on my forehead. Does anyone know if Mercedes dealers routinely replace rotors, instead of resurfacing rotors, because of the health hazard? Thanks in advance for your help.