1. Why must air tanks be drained?

    C. To drain moisture and oil out of the tank.
  2. What is a supply pressure gauge used for?

    B. To tell you how much air is in the air tanks.
  3. All vehicles with air brakes must have a low air pressure warning signal.

    A. True
    B. False
    A. True
  4. What are spring brakes?

    B. If the airbrakes leak down, springs press the brakes on to stop the vehicle.
  5. Front wheel brakes are good under all conditions.

    A. True
    B. False
    A. True
  6. When you apply your brakes, the air brake system works with an electric switch, by air pressure, to turn on the brake lights.

    A. True
    B. False
    A. True
  7. What do air brakes use to make the brakes work?

    C. Compressed air
  8. Air brakes are really three different braking systems: service brake, parking brake and emergency brake.

    A. True
    B. False
    A. True
  9. The service brake applies and releases:

    B. The brake when you use the brake pedal during normal driving.
  10. The parking brake applies and releases:

    B. The parking brakes when you use the parking brake control
  11. The emergency brake system:

    C. Uses parts of the service and parking brake system to stop the vehicle in the event of a brake system failure.
  12. The governor controls when the air compressor will pump into the air storage tanks.

    A. True
    B. False
    A. True
  13. The air storage tanks are used to hold compressed air.

    A. True
    B. False
    A. True
  14. When you put on the brakes by pushing down the brake pedal:

    A. Air pressure is applied to the brake pads.
  15. The S-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. It is called the S-cam because:

    A. It is shaped like the letter S.
  16. The air compressor is connected to the engine through:

    D. Both A and C
  17. The Air Compressor Governor controls:

    C. When the air compressor pumps air into the storage tanks
  18. Compressed air is stored:

    D. In the storage tank
  19. The Governor stops pumping air when it reaches the "cut out" level, or around:

    D. 125 psi
  20. The Governor allows the air to start pumping again when it reaches the cut in level, or around:

    D. 100 psi
  21. An air tank is equipped with a drain valve to remove:

    C. Water and oil
  22. Some air brake systems have an alcohol evaporator which helps:

    D. Reduce the risk of ice in the air brake valves during cold weather
  23. The air tank should be drained how often?

    B. Once a day
  24. The safety valve in the air compressor tank is set to open at:

    B. 150 psi
  25. When the safety valve releases air it means that:

    D. All of the above
  26. When you apply pressure to the brake pedal, you are:

    A. Pushing against a spring and against air pressure to the brakes
  27. Brake drums:

    D. All of the above
  28. Which type of brake is the most common in commercial vehicles?

    B. S Cam brakes
  29. An air pressure gauge:

    C. Shows how much pressure you are applying to the brakes
  30. All vehicles with air bakes are required to have a low pressure warning signal. This could be:

    D. Any one of the above
  31. When the low pressure warning is activated, you should:

    C. Bring the vehicle to a safe stop while you still control the brakes
  32. A dual air brake system:

    D. Has two air brake systems and one set of controls
  33. An emergency brake:

    D. All of the above
  34. To check the slack adjusters on S Cam brakes, you should:

    B. Wear gloves and pull hard on each slack adjuster
  35. To test the low pressure warning signal, you should do all BUT the following:

    B. Ask a friend to listen for the signal
  36. With dual air systems, the air pressure should build:

    D. From 85 to 100 psi in 45 seconds
  37. A fully charged air system typically has ____ psi:

    C. 125
  38. To test air leakage rate you should:

    A. Turn off the engine and release the service brake
  39. A combination vehicle air brake system should not lose air faster than:

    D. 3 psi per minute
  40. To check the air compressor governor "cut in" and "cut out" pressures:

    D. All of the above
  41. To test your service brakes you should:

    D. Release the parking brake, move forward slowly and depress brakes
  42. Stab braking occurs when you:

    D. All of the above
  43. Air brakes take longer to stop than hydraulic brakes because:

    B. It takes longer for the air to flow through the lines
  44. The proper way to go down long grades is to:

    C. Use a low gear and apply light pressure on the brakes
  45. You should use the parking brake:

    A. Any time you park
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