My 67 had DOT 5 in it since the early 1980s. The restoration was started in the late 70s and the original owner told me Dow Chemical gave him a couple gallons of DOT 5 to try. Amazingly, when I disassembled the calipers, wheel cylinders and master, all were spotlessly clean and attracted no rust, bores were all perfect as well. I have heard that this is another benefit of DOT 5.
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