yea i watched them. at two private shops i actually was sitting inside while thhe mech. opened annd closed the valves. the pedal feels firm once you push on it twice with engine off. however, the moment the engine is turned on, the pedal drops about 6 inches towards the firewall.
that is with constant pressure. The drop was never more than 2 or so inches when the system was performing well.
all the process in this article has been followed.
http://www.classicperform.com/TechBook/BrakeBleed.htm