I' with Turbs on this one. Take it back and get it checked, if it's new, it's free!! I've been driving coaches (sorry, tour buses ) for nearly 40 yrs, and would be very surprised at a system on a new vehicle which dumps all it's air to 0 in a week. I could, if you wish post the school bus brake test which is somewhat more comprehensive than the one already posted. If your vehicle passes that on your pre-trip, then you should be good to go.
If you can't wake up with a smile on your face, go to bed with a coat hanger in your mouth!!
2005 Ford F150 5.4
2011 Salem 21FBS