If you have access to an air compressor, fill caliper with fluid and then very slowly apply pressure, be sure to use the C-clamp as directed in my write-up.
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Attach the C clamp to one of the pistons but don’t squeeze it. *Pump the lever on the bar slowly to push out the other piston almost all the way. *Put the C clamp on that piston and push out the other one.
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Another way is a pair of channel locks, wrap the piston with something that will protect it from damage, like a piece of leather, etc. Then grab hold and slowly and easley twist and pull at the same time. Be VERY careful not to damage the piston.