Air Brake Test Basic 3

Question 1

What holds a spring brake in the released position during normal driving?

Accepted Answer

Air pressure

Answer

Air pressure compresses the power spring to keep spring brakes released.

Question 2

What happens to spring brakes if system air pressure drops too low?

Accepted Answer

They automatically apply

Answer

Spring brakes apply automatically when air pressure falls too low.

Question 3

How should you test the service brakes during a pre-trip air brake check?

Accepted Answer

Roll forward slowly and apply the brake pedal firmly

Answer

Move forward at low speed and apply the brakes to confirm they stop the vehicle and do not pull.

Question 4

What is brake fade in an air brake system?

Accepted Answer

Loss of braking power from overheated brakes

Answer

Brake fade is reduced stopping power caused by excessive heat from prolonged braking.

Question 5

What is the proper braking technique on a long, steep downgrade?

Accepted Answer

Use a low gear and light, steady brake application

Answer

Select a low gear for engine braking and use steady, controlled brake applications.

Air Brake Practice Test