et2...I am not being critical here...but please consider taking a air brake course. They have much different braking characteristics than what you are used to. For instance, when desending a steep, long grade, you maintain a constant braking pressue, not fan them like 'normal' brakes.
A person that operates air brake equipped vehicle needs to have some awareness of the workings and how to check and set your brakes.
When they dynamite, for instance. What that buzzer sound means. Where the compressor is and yes, your wet and dry tanks.
Gary Haupt