I figure it's break shoes rusted to the drums. I guess the best way to address that would be to go out there with the tool box, some liquid wrench, floor jack, jack stands and a brake adjustment tool and work each wheel. Start with trying to loosen the wheel cylinder adjustment and whack around on the drum. I guess you'd have to loosen the drum from the axel or spindle first. Not sure how best to approach this. Any thoughts?

1946 Chevy 1/2 Ton
http://s1246.photobucket.com/albums/gg615/dprawls/46%20Chevy/