Sounds like air in the lower system, or brakes too loose.
When you pump the upper cylinder a few times and get hard pedal, but no brakes, the lower cylinder is bottomed out and still no pressure to the wheel cylinders.
Verify the brakes are adjusted, then try power bleeding. Might try raising the front of the truck, power bleed from each rear bleeder up to the HV. Then raise the back, power bleed the fronts. A power bleeder can be a new (oil free) pump type oil can, or a pump sprayer. Just be sure not to introduce any more air.
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Today's Featured Article - Talk of the Town: How to Remove a Broken Bolt - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I have an aluminum steering gear housing with a bolt broken off in it. The bolt is about a 3/8" x 1 1/2" bolt. I've already drilled the center of the bolt out with about 7/64" drill bit the entire length of the bolt. Only one end of the bolt is visible. I tried to use an easy out but it wasn't budging and I didn't want t
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