Hello, I need some advice. I have bled the hydrovac and brake system as per the factory manual. After bleeding the system we had a decent feeling brake pedal. When the truck was started the pedal went down and just kept on going. We see no evidence of additional leakage from any lines or bleeders. We also see no fluid loss in the master cylinder. The truck will idle fine and I can hear no evidence of vacuum leaks around any of the hydrovac vac lines.
I would appreciate any help.

Thanks and best regards to all!!!