Couple of questions aboutg air system on class "A"

We don't want you to look like Gumby. The test for airbrakes is 1 minute to the floor, no loss. 1 minute engine shut off to the floor, no loss. Loss of air on airbrakes is unacceptable. Dryers are supposed to cycle every time the air reaches max PSI. It is just a P valve and dumps water when it cycles but like they say the desiccant is the poison. Easy to replace on tho.