The pistons where stuck in the calipers, but after a little pursuation I got them out. They did not came out with air pressure from my compressor, so tap them further in, put air pressure on it, tap them back in etc etc. After a while a loud bang and out they came one by one.

Then clean it all up to prep for painting. The bolts, clips, pistons and brake pad pins will go with the second batch to be zinc plated. The seals are all pretty much shot, so I need to find new ones.