Crist CDL free online BVM practice tests
NV Frenos de aire Fact Sheet
Questions on Test:
25
Correct answers needed to pass:
20
Passing Score:
80%
Age to apply:
18
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ús recto no debe ser superior a la del motor y los frenos aplicados.

Possible Answers:

1 psi en 30 segundos
1 psi en un minuto
3 PSI en un minuto
Answer:
3 PSI en un minuto
Explanation:
Con un sistema de aire completamente cargado, apague el motor, suelte el freno de estacionamiento y tiempo la caida de la presion de aire. La tasa de perdida debe ser inferior a dos psi en un minuto para los frenos de un solo vehiculo liberados, y tres con los frenos aplicados.

Califica esta prueba:
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  1. Air loss in a straight truck or bus should not be more than _____ with the engine off and the brakes applied.
  2. What activates the stop switch?
  3. 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.
  4. Vehicles with air brakes must have:
  5. Slack adjusters should not have any more than _____ of play?
  6. What is the best way to test your vehicle's low air pressure warning signal?
  7. Which vehicles must have low air pressure warning signals?
  8. On a long or steep downgrade, once you have reached your "safe" speed, brake until you are traveling
  9. To check the slack adjusters on S-cam drum brakes, you should first
  10. Before starting down a hill, you should be in the proper gear
  11. To apply the parking brakes under normal conditions,
  12. Slack adjusters are
  13. Which of the following is NOT part of the air brake system?
  14. Air braking takes more time than hydraulic braking because air brakes:
  15. In air brake vehicles, the parking brakes should be used:
  16. The brake pedal in an air brake system:
  17. Your vehicle has a dual air brake system, if a low air pressure warning comes on for the secondary system, you should?
  18. The tractor protection valve
  19. What is the first thing you should do if the low air pressure warning comes on?
  20. When should you use the parking brake?
  21. The supply pressure gauge shows the driver how much pressure:
  22. Which of the following is NOT part of the drum brake?
  23. The safety release valve will blow at _____ psi?
  24. In an emergency stop you should?
  25. What are spring brakes?