low brake pedal, 70 4 wheel manual drums

[70 shorty]

I did a search here, but pretty much every thread I saw dealt with disc brakes, disc brake conversions and/or power brakes. Mine is still the 4 wheel manual drum brakes. My pedal will go almost to the floor, but not all the way. I can not lock up the brakes either. I do not see any brake fluid on the inside of any wheel. At first I thought it was the front brake hoses, as they were cracked, so I guessed they were expanding. They are new now, and no difference. I need to replace the back hose just to rule that out. I have replaced the master cylinder as well, but that too made no change. I have bled the brakes and am fairly certain I got all the air out. I'm not loosing any fluid from the m/c. I still wonder if the replacement m/c is no good, and maybe I need another new one (or maybe was given the wrong one, as in one for power brakes as opposed to my manual brakes) Anyone have any other ideas to look for? On yeah, the truck used to stop fine (for a 4 wheel manual brake truck), but something has definitely changed.