Brake problem

There should be free play on the brake pedal. The pedal should move slightly before it pushes the rod into the master cyl. Your owners manual will tell you how much free play is needed. If there is free play the master cyl. could be assembled wrong not letting the piston uncover the bleed back hole. There is a spring in the master cyl. that pushes the piston back when the brake is released. Is this spring returning the piston to the starting point? Hope this helps. Just a longer explanation of what Greg said.
CORDially Mike

my guess is there is no gap between the rod and piston
on the master cylinder
it dosent take much but that releases the pressure in the system
maybe you should start again, bleed everything, adjust wheels
normally these are a good system and not very fussy
back up, take a second look, its something simple
greg

I recently installed a new brake master cylinder in my 1936 852. Right after I bled the lines and test drove it a little, the brake lights would come on on their own...even when no one was in the car. In addition, the front wheels are locked up...when I jack the wheels off the ground they won't turn. What have I done wrong? How do I fix it? Thanks, Mike McClelland