I have never removed the lip either. Has not been an issue. I would thing that the low cost of new rotors and the time involved in "grinding" the lip off and the stress of "being carefull not to grind the rotors into a useless piece of metal" would be a good voice of reason to just buy new rotors if you were worried about the lip and the function of something as important as brakes. The rotors on most MB cars are very reasonable in cost. Some are down right inexpensive. And, no, I am not talking about buying the cheapest ones you can find that do not meet OEM specs. They are inexpensive, cetrainly for something as easy to replace and as important as stopping the car.

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red