I hope I'm doing this right - new kid on the block. Can anyone suggest ways to get the pistons out on dual ironhead front brake calipers. I picked them up on ebay and they obviously sat dry for a long time. I've tried compressed air (125 psi). I also re-kitted the rear master cylinder and tried to use it with brake fluid to break them loose. No luck.

Is there something that I can fill the calipers with and let them soak that might loosen them up.

I seriously doubt that anykind of heat would be recommended unless it was a blow-dryer. Can anyone help?