Checking Air Brakes

All I do is listen for air leaks on the walk around checks, then when I’m in the cab I simply check the air tanks have pressure and the brakes work. I have never been taught anything more complicated, and never asked to do anything more on any assessments I have ever been on. The companies I have done agency work for are all pretty hot on compliance and doing things by the book, so I don’t imagine they’re missing anything.