Practice question

At what point should the air-brake warning device operate according to the teaching plan?

  1. When supply pressure falls below about two-thirds, or 65 percent, of the prescribed pressure
  2. Only when all air pressure is gone
  3. Only after the truck reaches 80 km/h
  4. Only when the parking brake is off

Answer: A — When supply pressure falls below about two-thirds, or 65 percent, of the prescribed pressure

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