Air Break Practice Test

Results

#1. What is the colour coding that is often used for the supply and service lines to the trailer?

Red for the supply line and blue for the service line

Blue for the supply line and red for the service line

Red for the supply line and green for the service line

Green for the supply line and red for the service line

To help ensure correct connection, the supply and service lines to the trailer are often colour coded. The supply line (also known as the emergency line) is coloured red, and the service line (also known as the control line) is coloured blue.