Air Brake Nylon Tubing Colors?

[juanprado]

When I used to sell parts, brake Tubing was only black. I now see green,red,blue & black.

What is the difference and what color is used for what application?

What is industry/HD repair best practices?

Thanks,

Juan

 

[wheelspinner]

Green is primary (rear ) brakes, red is secondary (front) brakes. Black is accessory air. Yellow (if you see it) is traditionally for governor air signal.

Pat