On the last day, when most of the folk were leaving, I walked around, listening. Out of the 100 or so coaches that were there, I only heard ONE doing an air brake check. Most folk at least did a walk around looking at lights, retrieving their electric and sewer, checking the oil, and other pre-trip related duties, but again, I only heard ONE coach operator doing an air brake check.
You certainly do not need a two year course in air brakes unless you might want to design something new.