Husband has Driving/ Pre-test/ Air brakes test in 3 days...Help - can you identify....

You don't need to know every part name.hoses looking for cracks ,belts checking for cracks,missing or broken bolts.relaxe it's not the end all.study what's in your Manul that not going to ask about the flex compuslater.if they do remember when this thing hits 80 mph your see some serious s@@@