The flashcards below were created by user jpjones36 on FreezingBlue Flashcards.

  1. The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like
    B. spring pressure
  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
    B. 2
  3. Your vehicle has a dual air brake system.  If a low air pressure warning comes on for the secondary system, you should
    A. bring the vehicle ato a safe stop and continue only when the system is fixed
  4. If your vehicle has an alcohol evaporator, it is there to
    D. reduce the risk of ice in air brake valves i cold weather
  5. Air braking takes more time than hydraulic braking because air
    B. takes more time to flow through the lines than hydraulic fluid
  6. The brake pedal in air brakes system
    C. controls the air pressure applied to put on the brakes
  7. 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 sort distance
  8. Modern air brake systems combine three different systems.  They are the service, parking , and the _____ brakes
    A. emergency
  9. To check the free play of manual slack adjusters on S-cam brakes, you should park on
    B. level ground, chock the wheels, and turn off the parking brakes
  10. Of the choices below, the first thing to do when a low air pressure warning comes on is
    A. stop and safely park as soon as possible
  11. The air compressor governor controls
  12. The braking power of the spring brakes
    C. depends on the service brakes being in adjustment
  13. All air brake equipped vehicles have
    C. a supply pressure gauge
  14. If you must make an emergency stop, brake so you
    C. can steer and your vehicle stays in straight line
  15. The application pressure guage shows how much air pressure you
    C. are applying to the brakes
  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
    B. at the end of each day of driving
  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
  18. If your vehicle has an alcohol evaporator, every day during cold weather yo should
    D. check and fill the alcohol level
  19. Why drain water from compressed air tanks
    B. water can freeze in cold weather and cause brake failure
  20. To test air service brakes, you should brake firmly when moving slowly forward.  The brakes are ok if you notice
    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?
    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
    C. 60
  23. During normal driving, spring brakes are ussually held back by
    B. air pressure
  24. In air brakes vehicles, the parking brakes should be used
    B. any time the vehicle is parked or unattended
  25. Emergency stab braking is when you
    D.Bake as hard as you can, release the brakes when the wheels lock, put on the brakes again when the wheels start rolling
  26. The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than
    D. 3 psi in one minute
  27. The supply pressure gauge shows how much pressure
    B. is in the air tanks
  28. The brake system that applies and releases the brakes when the driver uses the brake pedal is the ______ brake system
    B. service
  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
    D. stop right away and safely park.  continue only after the system is fixed
  30. Total stopping distance for air brakes is longer than that for hydraulic brakes due to ____ distance
    C. brake lag
  31. The most common type of foundation brake found on heavy vehicles is the
    C. S-cam drum
  32. Parking or emergency brakes of trucks and buses can be legally held on by ____ pressure
    A. spring
  33. If the air compressor develops a leak, what keeps the air in the tanks
    C. the one-way check valve
Card Set:
2013-11-01 20:13:06
CDL air brakes

Cdl Air Brakes
Show Answers: