Brakes problem
1995 Ford F350 V8 Two Wheel Drive Manual 261000 miles

same as the fellow with the 1992 , I clamped the front brake lines off and the pedal stays hard, blocked the rear lines off and the pedal stays hard but when front calipers are hooked up and bleed, the pedal eases to the floor. What is wrong?

Did you inspect the rear wheel cylinders if its drum type for leakage and also adjusted properly.

You block the rear there's no pressure at the wheel cylinders-once unblock pressure will go thru with wheel cylinders leaking it will not hold pressure.