O.k. so I completed a brake job on my 53 f-100. Turned drums, new shoes, all four wheel cylinders replaced, flushed old brake fluid and replaced with new, bled lines, now have a good pedal, adjusted all four wheels as close to equal as I could tell. One problem, now when I mash the brakes, it jumps to the left, HARD !! Could break your wrist if your not ready!! What in the world is causing this? I took the left front wheel off to inspect and found nothing on the drum or shoes.
You guys are great at long distance problem solving so lets get after it!!!!
THANKS!!

 

I suspect your right brake is not working, mechanical problem or line blockage. While disconnected, have someone push the brake pedal slowly and watch for a full stream of brake fluid out the hose. Brake hoses sometimes get an internal aneurysm that will block flow under pressure. How old are the brake hoses? Just replace them.
Do you have a seldom used loose surface road where you can lock up the brakes to determine if they are all working?

 

^^^ Brake hose are often the culprit. Are they new? If it's pulling to the left, the problem is likely on the right side, for what that's worth.

 

Ok I think I might know what's causing this.....

Drum brakes can "self lock" if they are new or old. Pretty much it means that the mechanical power assist that these floating drum brakes is equipped with goes haywire.... Due to some physical conditions that is hard to explain in writing.

This is what you should do:

Remove the drum and make a large chamfer or large fillet on the entering side on the breakliner on each shoe. By entering side I mean the side of the shoe that will come in contact with new drum metal as it turns forward.

I have had this exact behavior myself until an old man told me to do this very thing. I then also remembered that I during my college MSc made calculations on drum brake and during what conditions they could self bind......

If it pulls to the left it's at your left you should be fixing the problem. But I advice you to made the mods on both sides