manual brake shake boogie...

Front end...e brake is smooth when pulled at speed...im gonna see what i can see wih my own two eyes...whats wierd is that its fine below 40mph...ima probly turn down the drums on the lath to be safe, could the new shes be seated improperly or taking an extrodanarly long time to break in?

What could come loose on the front end? Steering is amazingly tight. Nothing LOOKS wrong, lugs are tight and the ball joints look -10,000 mi. Im woundering who has had similar gremlins? Who can give me a clue as to what other phenomenon than warped drums could be taking place?

Thanks in advance...