Whoops! I just re-read your post and realised you said rear.
Mr Haynes says the the original thickness on the rear is 10mm, but doesn't specify a minimum!
There's not much you can do about corrosion on a calliper, it doesn't indicate there's anything wrong with the internals. You could sand blast it and paint it red. ;>)
Edited by bathtub tom on 17/09/2010 at 00:29
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