cdl air brake test

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Author:
migz_46
ID:
307655
Filename:
cdl air brake test
Updated:
2015-09-10 23:54:49
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cdl
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air brake
Description:
cdl air brake
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The flashcards below were created by user migz_46 on FreezingBlue Flashcards. What would you like to do?


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

    A.Fluid pressure
    B.aire pressure
    C. spring pressure
    D.any of the above
    C. spring pressure
    (this multiple choice question has been scrambled)
  2. A straight truck or bus air brake system should not leak at a rate of more than ____ psi per minute with the engine off and the brakes released

    A.1
    B.3
    C.4
    D.2
    D.2
    (this multiple choice question has been scrambled)
  3. Your vehicle has a dual air brake system.  If a low air pressure warning comes on for the secondary system, you should

    A.continue at normal speed if only the secondary system fails
    B.Reduce your speed,and drive to the nearest garage for repairs 
    C.reduce your speed and test the remaining system while under why 
    D. bring the vehicle ato a safe stop and continue only when the system is fixed
    D. bring the vehicle ato a safe stop and continue only when the system is fixed
    (this multiple choice question has been scrambled)
  4. If your vehicle has an alcohol evaporator, it is there to

    A.Rid the wet tank of alcohol that condones and sits at the bottom.
    B. reduce the risk of ice in air brake valves i cold weather
    C.Eliminate the need for daily tank draining
    D.Boost tank pressure the same way that supercharger boost engines
    B. reduce the risk of ice in air brake valves i cold weather
    (this multiple choice question has been scrambled)
  5. Air braking takes more time than hydraulic braking because air

    A.brakes use different brake drums 
    B. takes more time to flow through the lines than hydraulic fluid
    C.brakes require heavier return springs 
    D.Is always leaking through air line fittings
    B. takes more time to flow through the lines than hydraulic fluid
    (this multiple choice question has been scrambled)
  6. The brake pedal in air brakes system

    A.Is connected to slack adjusters by a series of rods and linkage
    B. controls the air pressure applied to put on the brakes
    C.Always needs to be held down hallway during normal driving 
    D.the brake pedal in an air brake system 
    B. controls the air pressure applied to put on the brakes
    (this multiple choice question has been scrambled)
  7. If your truck or bus has dual parking control valves, you can use pressure from a separate tank to


    A.stay parked twice as long with your service air pressure 
    B.balance the service brake system whenever you are parked
    C.apply more brake pressure if the main tank is getting low 
    D.release the spring emergency/parking brakes to move a short distance 
    D.release the spring emergency/parking brakes to move a short distance
    (this multiple choice question has been scrambled)
  8. Modern air brake systems combine three different systems.  They are the service, parking , and the _____ brakes

    A. emergency
    B.foot 
    C.S-cam 
    D.Drum
    A. emergency
    (this multiple choice question has been scrambled)
  9. To check the free play of manual slack adjusters on S-cam brakes, you should park on

    A.Level ground with the parking brake,then apply the service brake.
    B. level ground, chock the wheels, and turn off the parking brakes
    C.A slight grade release the parking brakes, apply the service brakes, and checks for vehicle movement
    D.Level ground and drain off air pressure before adjusting 
    B. level ground, chock the wheels, and turn off the parking brakes
    (this multiple choice question has been scrambled)
  10. Of the choices below, the first thing to do when a low air pressure warning comes on is

    A.adjust the brake pedal for more travel 
    B. stop and safely park as soon as possible
    C.Shift to the next higher hear 
    D.open the air supply control valve
    B. stop and safely park as soon as possible
    (this multiple choice question has been scrambled)
  11. The air compressor governor controls

    A.the speed of the air compersure
    d. WHEN AIR IS PUMPED INTO THE AIR TANKS
    C.air pressure applied to the brakes 
    D.when air is pumped into the air tanks
    d. WHEN AIR IS PUMPED INTO THE AIR TANKS
  12. The braking power of the spring brakes

    A.AT least one brake heater 
    B.can only be tested by highly-trained brake service people 
    C.increases when the service brakes are hot
    D. depends on the service brakes being in adjustment
    D. depends on the service brakes being in adjustment
    (this multiple choice question has been scrambled)
  13. All air brake equipped vehicles have

    A.an air use gauge
    B. a supply pressure gauge
    C.At least one brake heater
    D.a hydraulic system in case the air system fails
    B. a supply pressure gauge
    (this multiple choice question has been scrambled)
  14. If you must make an emergency stop, brake so you

    A.use the hand brake first
    B. can steer and your vehicle stays in straight line
    C.us the full power of the brakes and lock them
    D.can steer hard while braking hard 
    B. can steer and your vehicle stays in straight line
    (this multiple choice question has been scrambled)
  15. The application pressure guage shows how much air pressure you

    A.have used in this trip 
    B. are applying to the brakes
    C.have in the air tanks 
    D.none of the above
    B. are applying to the brakes
    (this multiple choice question has been scrambled)
  16. If you do not have automatic tank drains, how often should you drain the oil and waer from the bottom of the compressed air storage air tanks


    A.once a week 
    B.every other week
    C.after every four hours of service
    D. at the end of each day of driving
    D. at the end of each day of driving
    (this multiple choice question has been scrambled)
  17. You should know that your brakes are fading when

    A. you have to push harder o the brake pedal to control your speed on a downgrade
    B.less pressure is needed on the brake pedal for each stop
    C.pressure on the brake pedal is released and speed in creases 
    D.the brake pedal feels spongy when pressure is applied 
    A. you have to push harder o the brake pedal to control your speed on a downgrade
    (this multiple choice question has been scrambled)
  18. If your vehicle has an alcohol evaporator, every day during cold weather yo should

    A.Clean the air filter with alcohol 
    B.change the alcohol from a new bottle 
    C.check the oil for alcohol
    D. check and fill the alcohol level
    D. check and fill the alcohol level
    (this multiple choice question has been scrambled)
  19. Why drain water from compressed air tanks


    A.water can freeze in cold weather and cause brake failure 
    B.why drain water from compressed air tanks 
    C.to keep from fouling the air compressor oil
    D.water cools the compressor too much 
    A. water can freeze in cold weather and cause brake failure
    (this multiple choice question has been scrambled)
  20. To test air service brakes, you should brake firmly when moving slowly forward.  The brakes are ok if you notice


    A.the vehicle "pulls" to one side 
    B.An usual feel 
    C.A delayed stopping action
    D. none of the above
    D. none of the above
  21. For long downhill grades, experts recommend using a low gear and light, steadypedal pressure instead of on-again braking. why?


    A. air usage is less with light steady pressure 
    B.brake linings do not heat up as much with light pressure 
    C.it works better with low gear in controlling speed 
    D. all of the above
    D. all of the above
  22. The driver must be able to see a waring before air pressure in the service air tanks fall below ___ psi

    A.50
    B.80
    C. 60
    D.40
    C. 60
    (this multiple choice question has been scrambled)
  23. During normal driving, spring brakes are ussually held back by

    A.spring pressure 
    B.centrifugal force
    C.bolts 
    D. air pressure
    D. air pressure
    (this multiple choice question has been scrambled)
  24. In air brakes vehicles, the parking brakes should be used

    A. any time the vehicle is parked or unattended
    B.to hold your speed when going downhill
    C.only during per and post-trip inspections
    D.as little as possible 
    A. any time the vehicle is parked or unattended
    (this multiple choice question has been scrambled)
  25. Emergency stab braking is when you

    A.press hard on the brake pedal and apply full hand valve until you stop 
    B.use light steady pressure on the brake pedal 
    C.Bake as hard as you can, release the brakes when the wheels lock, put on the brakes again when the wheels start rolling
    D.apply the hand valve for one second, then push hard on the pedal 
    C.Bake as hard as you can, release the brakes when the wheels lock, put on the brakes again when the wheels start rolling
    (this multiple choice question has been scrambled)
  26. The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than

    A.3psi in 45 seconds
    B.1psi in one minute 
    C.2psi in 45 seconds 
    D.1 psi in 30 seconds 
    A. 3 psi in one minute
    (this multiple choice question has been scrambled)
  27. The supply pressure gauge shows how much pressure


    A.is going to the brake chambers 
    B.the air can take
    C.you have used in this trip 
    D. is in the air tanks
    D. is in the air tanks
    (this multiple choice question has been scrambled)
  28. The brake system that applies and releases the brakes when the driver uses the brake pedal is the ______ brake system

    A. service
    B.parking 
    C.emergency 
    D.none of the above
    A. service
    (this multiple choice question has been scrambled)
  29. Your truck or bus has a dual air brake system. If a low air pressure warning come on for only one system, what should you do

    A.reduce your speed and test the remaining system while under 
    B.reduce your speed,and drive to the nearest garage for repairs 
    C. continue at a normal speed. no action is needed when only one system fails 
    D. stop right away and safely park.  continue only after the system is fixed
    D. stop right away and safely park.  continue only after the system is fixed
    (this multiple choice question has been scrambled)
  30. Total stopping distance for air brakes is longer than that for hydraulic brakes due to ____ distance

    A. brake lag
    B.effective braking
    C.reaction 
    D.perception 
    A. brake lag
    (this multiple choice question has been scrambled)
  31. The most common type of foundation brake found on heavy vehicles is the

    A.wedge drum 
    B.disc 
    C. S-cam drum
    D.none od the above
    C. S-cam drum
    (this multiple choice question has been scrambled)
  32. Parking or emergency brakes of trucks and buses can be legally held on by ____ pressure

    A.fluid 
    B.air 
    C.spring
    D.atmospheric
    C.spring
    (this multiple choice question has been scrambled)
  33. If the air compressor develops a leak, what keeps the air in the tanks

    A.the tractor protection valve 
    B.the emergency relay 
    C. the one-way check valve
    D.nothing
    C. the one-way check valve
    (this multiple choice question has been scrambled)

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