Hi Ya'll!

Next (maybe) dumb question is:

I put a new brake system in my '38 Ford rodded pickup including a under floor mounted pedal and master cyl. So, when the engine is off the brake pedal is all the way up but when the engine is running, the pedal is sucked about a third down to the floor and stays there. I know this is becuase of the vac. system but I don't know where to adjust the pedal to: it's running or non-running position?? Also, should I have a spring pulling the pedal back up each time after being depressed?

Big Gobs Of Thanks,

Dave M.