It has been my experience that typically Mercedes rotors last no more than 2 sets of pads before the rotors wear beyond minimum serviceable thickness. If you are somewhat mechanically handy, it is not difficult to change the pads and rotors yourself. Otherwise, it becomes an expensive job when the dealer does it.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record