A Team Porsche Race driver from the 70's told me that they would slip sandpaper between the discs and rotor and do a lap to "resurface" the rotors if they were giving less than optimal performance. 
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"It broke because it wants to be Upgraded "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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