I never heard that a rotor cannot warp. Interesting, since I have turned rotors on an Ammco lathe, and during the set up, you can see where metal is cut in the high spots and not touched on the low spots. That is a warped rotor, not left over brake pat material.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D