Case 850D brakes

I recently bought a Case 850D. The master cylinders were dry so I took them both off, cleaned them good and was able to bleed the right brake just fine, but on the left brake after when I bleed the air out of the line, I can only push the pedal about 1/3 of the way down and then the pedal comes to a hard stop, but as soon as I open the bleeder screw, the pedal moves on to the floor. Does anyone have any advice for me. I have taken the rubber boot off of the push rod so I can see how far the plunger is moving. Looking through the manuals that I have, I am thinking that this may be an adjustment issue.