Air Brakes Quiz

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Air Brakes Quiz

An air brake or, more formally, a compressed air brake system, is a type of friction brake for vehicles in which compressed air pressing on a piston is used to apply the pressure to the brake pad needed to stop the vehicle. Take the quiz and see how conversant you are with Air breaks.


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Questions and Answers
  • 1. 
    The parking brakes fail to apply on a truck with air brakes.Technician A says: That low air pressure in the spring brake chamber could be the cause.Technician B says: That a ruptured spring brake diaphragm could be the cause. Who is right?
    • A. 

      Technician A

    • B. 

      Technician B

    • C. 

      Both A and B

    • D. 

      Neither A Nor B

  • 2. 
    A service brake chamber leaks when the brakes are applied. Which of these could be that cause?
    • A. 

      Excessive push rod travel

    • B. 

      A bad chamber diaphragm

    • C. 

      A broken chamber return spring

    • D. 

      A misaligned push rod

  • 3. 
    When an air reservoir is drained, there is an excessive amount of moisture. This could be caused by?
    • A. 

      Cracked air compressor bracket.

    • B. 

      Clogged air compressor intake.

    • C. 

      Failed one way check valve.

    • D. 

      Failed air dryer purge valve.

  • 4. 
    What does the air compressor govern control?
    • A. 

      The brake chamber release pressure.

    • B. 

      Air pressure applied to the brakes

    • C. 

      Air compressor speed.

    • D. 

      Air pumped into the air tanks

  • 5. 
    Why should an operator drain water form compressed air tanks?
    • A. 

      Water cools the compressor excessively.

    • B. 

      Water mixed with oil causes brake over heating.

    • C. 

      Water can freeze and cause brake failure.

    • D. 

      Water can get into the compressor.

  • 6. 
    The most common type of foundation brake is the?
    • A. 

      Wedge drum brake.

    • B. 

      S-cam drum brake.

    • C. 

      Dual disc brake.

    • D. 

      Disc brake.

  • 7. 
    What does the air supply pressure gauge indicate?
    • A. 

      How much air has been used during the trip.

    • B. 

      A hydraulic system.

    • C. 

      The pressure in the air tank.

    • D. 

      The amount of air the tank can take.

  • 8. 
    The driver must be able to see the air pressure warning light come on before the pressure get below?
    • A. 

      40 PSI

    • B. 

      50 PSI

    • C. 

      60 PSI

    • D. 

      80 PSI

  • 9. 
    During normal driving, spring brakes are usually held back by?
    • A. 

      Centrifugal force.

    • B. 

      Spring pressure.

    • C. 

      Air pressure.

    • D. 

      Bolts

  • 10. 
    How often should you drain the air tanks, if its not done automatically on your vehicle? 
    • A. 

      At the beginning of each day of driving.

    • B. 

      At the end of each day of driving.

    • C. 

      Every four hours of driving.

    • D. 

      At least once a week.

  • 11. 
    Modern air brakes are a combination of service, parking, and what other brake system?
    • A. 

      Hand

    • B. 

      Drum

    • C. 

      Emergency

    • D. 

      Dual

  • 12. 
    All air brakes equipped vehicles have?
    • A. 

      A hydraulic system.

    • B. 

      At least one brake heater.

    • C. 

      An air use gauge.

    • D. 

      Air supply pressure gauge.

  • 13. 
    The driver of a truck with air brakes says: It has poor stopping power. Any of these could be the cause EXCEPT:
    • A. 

      The quick release valve exhaust port is plugged.

    • B. 

      The air pressure it too low.

    • C. 

      The application line is restricted.

    • D. 

      The brakes are out of adjustment.

  • 14. 
    All the brakes drag on a truck with hydraulic brakes. Which of these COULD be the cause?
    • A. 

      Air in the hydraulic system.

    • B. 

      Too high of a vacuum supply to the power brake booster.

    • C. 

      A leaking secondary cup in the master cylinder.

    • D. 

      No brake pedal free travel.

  • 15. 
    Blue marks on a disc brake rotor indicate which of the following:
    • A. 

      Excessive heat

    • B. 

      Identification marks

    • C. 

      Resurfacing specifications

    • D. 

      Excessive cooling

  • 16. 
    The minimum suggested lining thickness for drum brakes is?
    • A. 

      1/2- in

    • B. 

      1/4- in

    • C. 

      3/4- in

    • D. 

      1/3- in

  • 17. 
    Normal governor cut-in pressure is set to what pressure?
    • A. 

      150 psi

    • B. 

      175 psi

    • C. 

      125 psi

    • D. 

      100 psi

  • 18. 
    All of the following names describe air brake reservoirs EXCEPT:
    • A. 

      Primary

    • B. 

      Secondary

    • C. 

      Auxiliary

    • D. 

      Supply

  • 19. 
    A slack adjuster essentially functions as a:
    • A. 

      Gear

    • B. 

      Lever

    • C. 

      Anchor

    • D. 

      Server

  • 20. 
    Air disc brakes are designed to:
    • A. 

      Apply faster

    • B. 

      Last longer

    • C. 

      Decrease in-lane braking stability

    • D. 

      None of the above

  • 21. 
    Technician A says active ABS fault codes are intermittent. Technician B says fault codes explain the exact component failure. Who is right?
    • A. 

      Technician A

    • B. 

      Technician B

    • C. 

      Both A and B

    • D. 

      Neither A or B