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AS far as we know these are the stock calipers. I will check them out tomorrow and see if they contain iron.
Our local brake supplier says that he sees this often - that the pistons are of a material that does its best not to transfer heat to the brake fluid. What really bothers me is we have never seen this before. Will be checking all trucks in the fleet for the remainder of the week.
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David
1972 911T/S MFI Survivor
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