Practice question

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

To flip the air lines upside down
To apply the trailer parking brakes using air from the secondary system if the primary tank loses pressure
To reverse the direction of the air compressor engine
To heat the cab using warm air from the brake chambers

Answer: B — To apply the trailer parking brakes using air from the secondary system if the primary tank loses pressure

The correct answer is shown above. Try the full quiz for additional practice.