bbforks is most likely correct in that.
I will however add that the adjustment to correct for this must be made on the actual master cylinder pushrod clevis, not on other pedal links or stops.
Aside from the pedal being super tight without any free play, the other indicator to this condition is that you might start out a tour of duty and the brakes only drag slightly, but as the drums and wheel cylinders heat up, the drag becomes more severe.