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That's me too, only with red rubber grease in the pins. Copper slip on the pad retaining pins, for sure.
Ok, you're putting new pads in. This means pushing the pistons right back into the caliper body, so why grease them? The pistons get lubed with brake fluid on assembly, but almost all of that is taken off when they are pushed back. I suppose there might be a case for protecting the exposed piston area when the pads are part-worn, but like I said this would attract dirt and stuff in an area where you want things as clean as possible.
I'd love to know if there was a 'standard' practice here. Haynes doesn't mention grease at all, except on the pad backs, for what that's worth.
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