Not Ranked
I ran into the same problem. There was no minimum thickness listed in the Pep Boy's book so they did not want to turn them. The problem was solved when we turned the rotors over and saw the minimum thickness dimension cast into the inner side of the rotor. It looks like .45, but with them installed I can't get a clear view. It cost me $5 each for the surfacing, you may want to take another look at yours before you replace them.
-Jon
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