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Obviously the best choice is new pistons.
But an interesting experiment might be to try some of the stuff guys use to repair pitting in hydraulic cylinders on large equipment until rebuilding is possible. These pistons (rods really) face the same types of stress if not more than brakes. The pits can cause seal tear and leaks so this substance fills the voids and stops further damage. A lot of work to do it twice if it doesn't work though.
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Jeff
74 911, #3
I do not disbelieve in anything. I start from the premise that everything is true until proved false. Everything is possible.
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