[BMERDOC]

Try gravity bleeding followed by a two man brake pump. Remind your pedal pumper that they aren't trying to shake up a beer, nice deliberate, top-to-bottom, slow pumps. Add a short piece of vacuum line to the bleeder end to eliminate bubbles. Hopefully the proportioning valve hasn't popped or you'll have to reset it by pulling the pin. Try turning the bleeder and if it snaps off get a new cylinder, you'd need one anyway by that time.