Knowledge Of Air Brakes

29 Questions

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Knowledge Of Air Brakes

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Questions and Answers
  • 1. 
    When you apply the brakes, the brake shoes/linings are pressed against the 
    • A. 

      S-cam

    • B. 

      Slack adjuster

    • C. 

      Brake drum

    • D. 

      All of the above

  • 2. 
    With air brake vehicles, the parking brakes should be used
    • A. 

      As little as possible

    • B. 

      Whenever you leave the vehicle unattended

    • C. 

      Only during pre-trip inspections

    • D. 

      None of the above

  • 3. 
    All air brake equipped vehicles have
    • A. 

      An air use gauge

    • B. 

      A backup hydraulic system

    • C. 

      An air supply pressure gauge

    • D. 

      All of the above

  • 4. 
    The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like
    • A. 

      Spring pressure

    • B. 

      Air pressure

    • C. 

      Hydraulic pressure

    • D. 

      All of the above

  • 5. 
    The parking or emergency brakes of trucks and buses can be legally held on by _____ pressure
    • A. 

      Air

    • B. 

      Spring

    • C. 

      Fluid

    • D. 

      None of the above

  • 6. 
    Modern air brake systems are three different systems combined together. They are the service, parking and the _______ brakes
    • A. 

      S-cam

    • B. 

      Foot

    • C. 

      Emergency

    • D. 

      All of the above

  • 7. 
    The stop light switch
    • A. 

      Tells you when the air brake system is low on air pressure

    • B. 

      Turns on the brake lights to warn drivers behind you

    • C. 

      Tells you when you need to use your emergency brakes

    • D. 

      All of the above

  • 8. 
    If your truck has a dual air brake system and one of the systems is low on pressure
    • A. 

      The manual slack adjusters on the S-cam brakes are not set properly

    • B. 

      Either the front or rear brakes will not be fully operational

    • C. 

      The brake drums will not be fully pressurized

    • D. 

      All of the above

  • 9. 
    The braking power of the spring brakes
    • A. 

      Is not affected by the condition of the service brakes

    • B. 

      Can only be tested by highly trained brake service people

    • C. 

      Depends on the service brakes being in adjustment

    • D. 

      All of the above

  • 10. 
    The application pressure gauge shows how much air pressure you 
    • A. 

      Are applying to the brakes

    • B. 

      Have in the air tanks

    • C. 

      Have in the modulating control valve

    • D. 

      All of the above

  • 11. 
    Before driving a truck or bus with a dual air brake system, the pressure in each system should be at least ________ psi
    • A. 

      80

    • B. 

      100

    • C. 

      120

    • D. 

      All of the above

  • 12. 
    If your truck or bus has dual parking control valves, you can use pressure from a separate tank to
    • A. 

      Release the spring emergency/parking brakes to move a short distance

    • B. 

      Balance the service brake system when you are parking

    • C. 

      Stay parked twice as long without using up service air pressure

    • D. 

      All of the above

  • 13. 
    The brake pedal in an air brake system
    • A. 

      Connects the slack adjusters by a series of rods and linkages

    • B. 

      Controls the speed of the air compressor

    • C. 

      Controls the air pressure applied to put on the brakes

    • D. 

      All of the above

  • 14. 
    What is the first thing you should do when a low air pressure warning comes on
    • A. 

      Adjust the brake pedal for more travel

    • B. 

      Stop and safely park as soon as possible

    • C. 

      Open the air supply control valve

    • D. 

      All of the above

  • 15. 
    The S-cam
    • A. 

      Forces the brake shoes against the inside of the brake drum

    • B. 

      Controls the flow of air into each of the brake chambers

    • C. 

      Pulls the brake shoes away from the drum and allows the wheels to roll freely

    • D. 

      All of the above

  • 16. 
    When is it ok to leave your truck unattended without applying the parking brake or chocking the wheels?
    • A. 

      If you will only be away from the truck for a few minutes

    • B. 

      If you are conducting a pre-trip inspection

    • C. 

      Never

    • D. 

      None of the above

  • 17. 
    In air brake vehicles, the parking brakes should be used
    • A. 

      Any time the vehicle is parked

    • B. 

      To hold your speed when going downhill

    • C. 

      As little as possible

    • D. 

      All of the above

  • 18. 
    The modulating control valve allows you to control the 
    • A. 

      Front brakes

    • B. 

      Amount of air pressure in the brake system

    • C. 

      Spring brakes

    • D. 

      All of the above

  • 19. 
    The brake system that applies and releases the brakes when the driver uses the brake pedal is the _____ brake system
    • A. 

      Service

    • B. 

      Emergency

    • C. 

      Parking

    • D. 

      All of the above

  • 20. 
    Some air brake systems have an alcohol evaporator. What may happen if you don't keep the unit filled with alcohol?
    • A. 

      Ice may from on the brake drums and warp them

    • B. 

      The S-cam may not rotate back when you release the brake pedal

    • C. 

      Ice may form in the air storage tanks and cause the brakes to fail

    • D. 

      All of the above

  • 21. 
    Under normal conditions, to engage the parking brake the driver must first
    • A. 

      Be sure that the air brake system is fully pressurized

    • B. 

      Turn off the engine

    • C. 

      Let the air out of the spring brakes

    • D. 

      All of the above

  • 22. 
    During normal driving, spring brakes are usually held back by 
    • A. 

      Air pressure

    • B. 

      Spring pressure

    • C. 

      Bolts

    • D. 

      All of the above

  • 23. 
    If your vehicle has an alcohol evaporator, every day during cold water you should
    • A. 

      Check the oil for alcohol content

    • B. 

      Check and fill the alcohol level

    • C. 

      Change the alcohol from a new bottle

    • D. 

      All of the above

  • 24. 
    The most common type of foundation brake found on heavy vehicles is the
    • A. 

      Dis brake

    • B. 

      Wedge drum

    • C. 

      S-cam drum

    • D. 

      None of the above

  • 25. 
    A supply pressure gauge tells you how much pressure is in the 
    • A. 

      Tractor brake lines

    • B. 

      Air tanks

    • C. 

      Trailer brake line

    • D. 

      None of the above

  • 26. 
    The air compressor governor controls
    • A. 

      When air is pumped into the air storage tanks

    • B. 

      The speed of the air compressor

    • C. 

      Air pressure applied to the brake

    • D. 

      None of the above

  • 27. 
    It is not safe to drive a vehicle that has brake drums (or discs) with cracks or that are thinner than the manufacturer's specifications, generally this will be ____ inch
    • A. 

      1/2

    • B. 

      1/3

    • C. 

      1/4

    • D. 

      All of the above

  • 28. 
    Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?
    • A. 

      Stop and safely park. Continue only after the system is fixed

    • B. 

      Reduce your speed and test the remaining system while driving

    • C. 

      Reduce your speed and drive the the nears garage for repairs

    • D. 

      All of the above

  • 29. 
    If the spring brakes are on, when should you push the brake pedal?
    • A. 

      Never

    • B. 

      Only when driving down a hill

    • C. 

      Only on a slippery road

    • D. 

      All of the above