Brazilian Dodge Dart 76 (similar to 69 usa)

I started to work on front brake calipters. I removed hoses.. (one of them I hade a hard work).

Now I'm trying to remove calipters pistons... really hard work. They don't move!!!

I used a lot of WD-40.. I really hate it. I will try to heat pistons. Perhaps I drill a hole to pull pinston.