hi art and sages- saw that only once in 78 on an old dodge. problem was the rotor was bent and out of true which allowed out of line wear on one side . the other side was not worn unevenly b/c the owner had put a beveled shim between the piston and the brake pad to compensate for the bent rotor. think they call this parallelism. never saw anything like it before or since. talk about a half ass repair. uncle moe said it wasnt- it was whole ass.guessed the rotor got bent by a misalignment or defect on the caliper slides. btw art if that same grenade was placed in a cream filled blintz wouldnt that also be a napoleon blown apart? thanks tons oldduke