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Just my 2c, I went with Stoptech have run 3 track days 2 at mid-Ohio and 1 at NJMP Lightning. I'll put it this way using the new pistons and Hawk DTC 60 pads, with much higher brake temps... I assume this because the calipers turned grey to a goldish color. The stoptech pistons and seals are holding up well.
The black crust is from the back coating on the pads steel plate not the pistons or seals themselves.
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