Gi'me a brake! front drum question

OK, I followed the tips on this board to bleed my brakes. I had my son work the pedal while I worked the bleeding valve. The rear drums bled fine but having problems with both front brakes. No matter how much we tried to bleed them, I could get no fluid, even with a new master cylinder(it was bench bled). I even tried a brake bleeder but all it pulled on the brakes was a vacuum. Manual brakes. Can someone point me in the right direction?

tanks.