Air Brakes/pre-trip

14 Questions

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Air Brakes/pre-trip

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Questions and Answers
  • 1. 
    The driver must be able to see a warning before air pressure in the service air tans falls below ____ psi.
    • A. 

      80

    • B. 

      55

    • C. 

      50

    • D. 

      All of the above

  • 2. 
    To check the brake slack on S-cam brakes, you should park on
    • A. 

      Level ground, chock the wheel, and release the parking brakes

    • B. 

      A slight grade, release the parking brakes, and apply the service brakes, watching for vehicle movement

    • C. 

      Level ground and apply the parking brakes

    • D. 

      All of the above

  • 3. 
    The air brakes system for a straight truck or bus should not leak at a rate of more than ____ psi per minute with the engine off and the brakes released
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      All of the above

  • 4. 
    The air loss rate for a straight truck or bus with the engine off and the brake on should not be more than
    • A. 

      3 psi in one minute

    • B. 

      2 psi in 45 seconds

    • C. 

      1 psi in one minute

    • D. 

      All of the above

  • 5. 
    If your vehicle has an alcohol evaporator, it is there to
    • A. 

      Eliminate the need for daily tank draining

    • B. 

      Reduce the risk of ice in air brake valves in cold weather

    • C. 

      Rid the wet tan of alcohol that condenses and sits at the bottom

    • D. 

      All of the above

  • 6. 
    How should you check that your service brakes are working properly?
    • A. 

      Park on level ground, chock the wheels, engage the parking brake and shut the engine off

    • B. 

      Park on a slight incline, drain off air pressure, set the parking brakes and check for movement

    • C. 

      Wait for normal air pressure, release the parking brake, move the truck forward slowly, and apply the brake firmly using the brake pedal

    • D. 

      All of the above

  • 7. 
    The air supply pressure gauge shows how much pressure
    • A. 

      Is going to the brake chambers

    • B. 

      Is in the air tanks

    • C. 

      You have used in this trip

    • D. 

      None of the above

  • 8. 
    Why should you drain water from compressed air tanks?
    • A. 

      Water cools the compressor too much

    • B. 

      The boiling point reduces braking power

    • C. 

      Water can freeze in cold weather and cause brake failure

    • D. 

      All of the above

  • 9. 
    The safety valve is set to automatically reduce pressure at ____ psi
    • A. 

      150

    • B. 

      100

    • C. 

      50

    • D. 

      All of the above

  • 10. 
    If air pressure does not build up fast enough within the correct amount of time
    • A. 

      Your air pressure may drop too low during driving

    • B. 

      You should be ready to use your parking brake to help stop

    • C. 

      The alcohol container may be low

    • D. 

      All of the above

  • 11. 
    How should you check that the spring brakes come on when air pressure in the system drops below a certain level?
    • A. 

      Park on level ground, wait for normal air pressure, release the parking brake, move the truck forward slowly and apply the brakes firmly using the brake pedal

    • B. 

      Park on a slight incline, drain off air pressure, set parking brakes and check for movement

    • C. 

      Park on level ground, chock the wheels, release the parking brake when you have enough air pressure, shut the engine off, and repeatedly press and release the brake pedal

    • D. 

      All of the above

  • 12. 
    For air brake systems in good condition, the air compressor should start pumping at about ______ psi.
    • A. 

      100

    • B. 

      125

    • C. 

      150

    • D. 

      All of the above

  • 13. 
    To test air service brake, you should
    • A. 

      Brake firmly when slowly moving forward

    • B. 

      Stop the vehicle, put it in low gear, depress the service brake, and then gently pull against the brakes

    • C. 

      Brake firmly when slowly moving backwards

    • D. 

      All of the above

  • 14. 
    If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of the compressed air storage air tanks?
    • A. 

      After every four hours of service

    • B. 

      Once a week

    • C. 

      At the end of each day of driving

    • D. 

      All of the above