What color is the Supply/emergency line in a color-coded air brake system?

In a color-coded air brake system, the Supply/emergency line is designated by the color red. This color coding serves an important purpose in ensuring that operators can quickly identify the different lines and their functions within the air brake system. The red color specifically indicates that the line is responsible for delivering air pressure from the compressor to the storage tanks and also serves to activate the trailer's emergency features in the event of a failure.

By using a standardized color for the Supply/emergency line, it becomes easier for drivers and maintenance personnel to recognize and differentiate these crucial components, promoting safety and efficiency in handling air brake systems. Understanding this color coding is vital for anyone working with air brakes, as it helps prevent mistakes that could lead to dangerous situations on the road.