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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