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You are completely describing a failed or leaking brake booster.
I would change the brake booster out. The telling sign for me was your description in how the pedal slowly goes to the floor with engine running, but doesn't when it is not running. If it was a fluid leak, it would go to the floor at all times. You only have it going to floor when running so the pressure in the booster is leaking off.
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There can be, yes, but does your brakes feel like you are not stopping like you should? Usually when there is air there, you feel like you are not stopping and not just the pedal going down. You go down a little bit and stop when there is air. You don;t keep going down and down and down.
Spray soapy water on the booster and have someone press on the brakes. You will see bubbles.
Do you have rear wheel ABS on the van? That valve is for the ABS if you do.
Correct. You will need a scanner for that to activate the ABS pump. Autozone will have one for free. You just activate the pump, crack a bleeder valve, and it will push the air out on its own, then you bleed like normal from there.
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I'm opting out. Booster will create bubbles if leaking for when you push in and let of the brakes, the pressure goes back out of the booster.
On the tool, every single Ford shop has a IDS and nearly every scanner with ABS can activate the pump for a bleed.
Based on your response, you are not skilled in doing the work or you are trying to get a free answer. Both are fine. I just will not help you for your response and comment is false.
Welcome, I'm Chris (aka Moose) I'm an independent contractor here at Just Answer.
Different tech here, would you like me to try and help?
Thanks for asking your question and letting me try to help you.