4spdragtop said

1st off, I take no credit for this idea or "how to". The idea came up in another disc brake thread and hemi71x mentioned this idea.
Anyway, rusty KH calipers with seized pistons.
Set in calipers in evaporust for 24 hours, pulled out. Stuff works awesome.
I found a 3/8-24 fine thread bolt and threaded finger tight into brake fitting hole. Finger tight. Put caliper in vice and put an air nozzle with rubber tip 140 psi into other hole. Didnt budge, nada.
Then I remembered Jim mentioned threading a grease fitting in and using pneumatic/grease gun to pop them out.
Kinda self explanatory see pics.
Worked like a charm, thanks Jim!

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