Semi Trailer Air Systems. Part 1 - Air Brake plumbing and valve operation.

Part 1 in this video series goes over the plumbing and valve operation of a basic air brake system.  We talk about how the air is delivered from the glad hands, to the service and emergency relay valves and out to the brake chambers.
Part 2 (coming soon-ish) will cover other valves and accessories using air, (height control valve, tire auto inflation valve, slider pin release valve ect.)