Air Brakes CDL (Maryland)

48 Questions | Total Attempts: 148

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Air Brakes CDL (Maryland)

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Questions and Answers
  • 1. 
    Air Brakes are compossed of two different braking systems.
    • A. 

      True

    • B. 

      False

  • 2. 
    The v-belt controls when the air compressor will pump air into the air storage tanks.
    • A. 

      True

    • B. 

      False

  • 3. 
    Water can freeze in cold weather and cause brake failure.
    • A. 

      True

    • B. 

      False

  • 4. 
    To reduce the risk of ice in air brake valves, the alcohol evaporator removes alcohol from the air system.
    • A. 

      True

    • B. 

      False

  • 5. 
    The safety valve is usually set to open at 150 psi.
    • A. 

      True

    • B. 

      False

  • 6. 
    The s-cam forces the brake shoes away from one another and away from the inside of the drums.
    • A. 

      True

    • B. 

      False

  • 7. 
    Increasing application pressure to hold the same speed means the brakes are not fading.
    • A. 

      True

    • B. 

      False

  • 8. 
    A warning signal must come on before the air pressure in the tanks falls below 75 psi.
    • A. 

      True

    • B. 

      False

  • 9. 
    Parking brakes must be held on by mechanical force.
    • A. 

      True

    • B. 

      False

  • 10. 
    If the air pressure is removed, the brakes cannot be put on.
    • A. 

      True

    • B. 

      False

  • 11. 
    Tractor and straight truck spring brakes will come fully on when air pressure drops to a range of 20 to 45 psi.
    • A. 

      True

    • B. 

      False

  • 12. 
    If the brakes are not adjusted properly, the regular brakes will not work right but the emergency/parking brakes will work right.
    • A. 

      True

    • B. 

      False

  • 13. 
    When main air pressure is lost, the spring brakes come on.
    • A. 

      True

    • B. 

      False

  • 14. 
    Before driving a vehicle with a dual air system, allow time for the air compressor to build up to a minimum of how much pressure in the primary and secondary systems?
    • A. 

      30 psi

    • B. 

      100 psi

    • C. 

      50 psi

    • D. 

      125 psi

  • 15. 
    To test the low pressure warning signal, shut the engine off when you have enough air pressure so that the low pressure warning signal is not on.  Then keep pumping the brake pedal until the low pressure warning comes on. 
    • A. 

      True

    • B. 

      False

  • 16. 
    When the engine is at operating rpms, the pressure whould build from 85 to 100 psi within how many seconds in dual air systems?
    • A. 

      35 seconds

    • B. 

      15 seconds

    • C. 

      60 seconds

    • D. 

      45 seconds

  • 17. 
    Pumping by the air compressor should start at about:
    • A. 

      100 psi

    • B. 

      125 psi

    • C. 

      150 psi

    • D. 

      200 psi

  • 18. 
    In an emergency stop, you should brake in a way that will turn the vehicle.
    • A. 

      True

    • B. 

      False

  • 19. 
    Perception Distance + Brake Lag Distance = Total Stopping Distance
    • A. 

      True

    • B. 

      False

  • 20. 
    The air brake lag distance at 55 mph on dry pavement adds about:
    • A. 

      12 feet

    • B. 

      22 feet

    • C. 

      32 feet

    • D. 

      42 feet

  • 21. 
    Brakes can fade or fail from excessive heat.
    • A. 

      True

    • B. 

      False

  • 22. 
    The use of brakes on a long and/or steep downgrade is more important than the braking effect of the engine.
    • A. 

      True

    • B. 

      False

  • 23. 
    Release the brakes when your speed has been reduced to approximately how much below your "safe" speed?
    • A. 

      5 mph

    • B. 

      7 mph

    • C. 

      10 mph

  • 24. 
    A heavily loaded vehicle will take a short distance to stop.
    • A. 

      True

    • B. 

      False

  • 25. 
    When driving down a long steep hill you should use a low gear and...
    • A. 

      Use stab braking

    • B. 

      Begin braking when you are 5 mph above your "safe" speed

    • C. 

      Go slow enough that a fairly light, steady use of the brakes will keep you from speeding up...

    • D. 

      Use the trailer brakes