JR North writes:

Surface hardening due to excessive heat (read seizing caliper). The
rear calipers have park brake-actuated pistons. Seized park brake
cables will cause the rear calipers to stay applied. The inner pad
gets the brunt of the force.
JR

Interesting theory. Thanks. I know the car's never had a seized caliper;
or parking brake, but it might have been dragged at some point. And, the
car does go to the track every so often.

That would say that the rotor could be turned until smooth and would be
OK. [They are way above the min. thickness spec.]



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