CDL Commercial Driver's License Knowledge Test

What is the function of the relay valve in an air brake system?

To relay messages to the driver To speed up brake application and release on trailers by using local air supply near the brakes To control the turn signals To power the air horn

Correct Answer:

To speed up brake application and release on trailers by using local air supply near the brakes

Access more questions from this quiz

Continue to CDL Commercial Driver's License Knowledge Test for more practice questions and the full quiz experience.

Access More Questions