Pull the bleeder and fill the caliper with snake oil of your choice (PB Blaster, Kroil, etc) and let it sit for a day. Then use compressed air and a C clamp to prevent piston form becoming a projectile. A little heat from a heat gun helps as well, as does a a few rags wrapped around it.
*Edit* Heat the caliper body- not the piston (heat=expansion)
*Edit* Heat the caliper body- not the piston (heat=expansion)
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