Measure the thickness of the rotors. I have found that MB rotors typically last 2 sets of pads before they get worn down below min thickness. Chances are that once you turn them, they will be close to or below min thickess. Best bet is usually to replace them since they are really not that expensive anyway.

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Ali Al-Chalabi

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