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That is PSI on a gauge connected to the rear service gladhand. Had my grandson driving and after releasing the brakes and rolling, he used just enough pedal to bring it to a stop, I would read the pressure behind the truck as it came to a stop... Having him depress the pedal hard yielded just...

Ok, well cannot really watch it while driving, but it takes about 50 psi using just enough pedal to bring it from a roll to a stop at idle in 2nd. It took around 75 psi to do the same thing in first...

You got me curious and I remembered the vented gladhand covers from the front are 1/8” NPT. Removed a vent and added a gauge then hooked it to the service gladhand at the back. I got 0-100 PSI that varied in a linear fashion with pedal position... 10 psi static sounds weird and 35 PSI sounds...

Ok, now I am tracking. Sorry, I dont have a gladhand tire hose, so unfortunatly I cannot help you...

The pedal is a variable regulator so 0-120(or whatever is in the service tanks). You would have to put a gauge on a service line to answer your question.