Clutch Pedal Sticks to the Floor

I changed my slave cylinder and when I went to bleed the clutch the pedal stuck to the floor. Me and a buddy bled the clutch for about a half hour and still air, no fluid. Is there something else I could do?

 

Sometimes you have to use your hand to manually pump up the cylinders. Use your hand to push down and pull up on the pedal. Some new slave and master cylinders I have replaced required up to 20 or 30 repetitions. gravity bleeding usually does not work well on clutches unfortunately, so that method is least likely to work.