For the best performance, it is best to turn the entire rotor. This will remove the lip and give the new pads a perfectly flat and appropriately roughened surface to bed into. I don't see any advantage in having a machine shop remove just the lip (and not turn the entire face of the rotor) because most of the cost in turning a rotor is generally in the setup.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
Last edited by thstone; 08-06-2012 at 11:49 AM.
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