CDL Air Brakes Endorsement II Practice

15 Questions

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CDL Air Brakes Endorsement II Practice

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Questions and Answers
  • 1. 
    What is a dual air brake system?
    • A. 

      A two brake system, one operates the front brakes and one operates the back brakes.

    • B. 

      A two braking system, one for each side of the vehicle.

    • C. 

      A two braking system, one for daytime and one for nighttime driving.

  • 2. 
    What are the slack adjusters?
    • A. 

      It is the space between the back wheels.

    • B. 

      It is an adjusting nut on the backside of the brake drum used for adjusting the brakes.

    • C. 

      It is an adjusting nut under the cab to adjust the springs.

  • 3. 
    How can you check the slack adjuster?
    • A. 

      Park on level ground, turn off parking brakes, pull hard on each slack adjuster. It shouldn't move more than one inch.

    • B. 

      Park on level ground, turn off parking brake and press brake pedal.

    • C. 

      Park on an incline and see if the vehicle rolls.

  • 4. 
    How can you test the low pressure warning signal?
    • A. 

      While the engine is running, step on and off the brake pedal.

    • B. 

      Shut off the engine and see if the air pressure leaks down.

    • C. 

      Shut off the engine with enough air pressure, turn on the electrical power and step on and off the brake pedal until the low air pressure warning signal comes on.

  • 5. 
    What can you check to see if the spring brakes come on automatically?
    • A. 

      Step on and off the brake, with the engine off, the parking brake knob should pop out when air pressure falls between 20-40 psi.

    • B. 

      Get under the vehicle and pull on the spring brakes.

    • C. 

      Turn on the engine and pump the brake pedal down to the floor.

  • 6. 
    What are the maximum leakage rates?
    • A. 

      Less than four psi in one minute for single vehicles and less than eight psi in one minute for combination vehicles.

    • B. 

      Less than two psi in one minute for single vehicles and less than three psi in one minute for combination vehicles.

    • C. 

      Less than six psi for all vehicles.

  • 7. 
    Should you ever leave your vehicle unattended without applying parking brakes or chocking the wheels?
    • A. 

      Yes

    • B. 

      No

  • 8. 
    If you are away from your vehicle only a short time, you don't need to use the parking brake.
    • A. 

      True

    • B. 

      False

  • 9. 
    How often should you drain air tanks?
    • A. 

      Daily

    • B. 

      Weekly

    • C. 

      Monthly

  • 10. 
    The use of brakes on a long steep downgrade is only a supplement to the braking effect of the engine.
    • A. 

      True

    • B. 

      False

  • 11. 
    What factors can cause brakes to fade or fail?
    • A. 

      Not pressing the brake pedal hard enough.

    • B. 

      Over heating, low air pressure, and not relying on the engine braking effect.

    • C. 

      Not taking your foot off the accelerator pedal.

  • 12. 
    Why should you be in the proper gear before starting down a hill?
    • A. 

      So you only have to apply the brake just hard enough to feel a definite slowdown

    • B. 

      So you don't have to shift gears going downhill.

    • C. 

      So you can go through the gears on the way down.

  • 13. 
    If oil and water collect in the air tanks what can happen to the brakes?
    • A. 

      The brakes could heat up.

    • B. 

      The brakes could fail.

    • C. 

      The brakes could lock up.

  • 14. 
    What is the purpose of an alcohol evaporator?
    • A. 

      So you don't have to drain the air tanks as often.

    • B. 

      To have a drink available if you get thirsty.

    • C. 

      To reduce the risk of ice in the brake valves and other parts in cold weather.

  • 15. 
    What is another name for controlled braking?
    • A. 

      Steady braking

    • B. 

      Squeeze braking

    • C. 

      Hard braking