Practice question

At what air pressure must the low air pressure warning device (buzzer or red light) activate in a commercial air brake vehicle?

  1. Before air pressure drops below approximately 60 PSI (around 4.1 bar)
  2. Only when air pressure reaches 0 PSI
  3. At 100 PSI
  4. Only when the vehicle comes to a complete halt

Answer: A — Before air pressure drops below approximately 60 PSI (around 4.1 bar)

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