Joe, here comes an information that isn't really helpful to you but it might be of certain interest nevertheless. If someone in Germany wanted to know the wear limit of his brake drums then he had two sources:
a) the workshop manual and/or b) a general table book for lathe operators
As rule of thumb circulated 1 mm (0.039") for cars and 2 mm (0.079") for trucks. By help of a center punch the drums were marked to calculate further jobs and resulting brake lining thickness.
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