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Mex,
It is quite possibly the problem is the corrosion on the surface of the pin, look at the little rusted bumps along the length of the pin - they may be enlargeing the overall diameter of the pin and are now forced into the other side of the caliper. Take a strip of emery (sand) paper and do a surround cleaning/grinding of the total length of the pin before you do anything more.
Lubricate the pin with your favorite penetrant - (1/2 ATM fluid and 1/2 Acetone is far more effective than any commercial product).
Tap the pin from the other side to get some movement and grab hold of the pin with a vice grip and rotate it. (Don't deform the surface or you will have to file off the burrs to get it thru the caliper hole).
Once you get rotation and in-out movement it should slide out with a light tapping.
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