You have to ajust the brake shoes (bring them up to the drum) first. Adjust them until you can't turn the drums. Then back them off just until the shoes allow the drum to turn. I can just hear the shoes drag a hair when I turn them. You want to adjust them as close to each other as you can. I'll bet after you do this, they will probably work.
Have your drums been turned? Are the drums still within specs? If they have been turned out too far you may get some wheel cylinder leaking problems.
