Practice question

What is the function of the quick release valve in an air brake system?

  1. To disconnect the trailer from the fifth wheel instantly
  2. To exhaust air quickly from brake chambers close to the wheels when the pedal is released, preventing brake drag and delay
  3. To empty the fuel tank in an emergency
  4. To drop tyre pressures during desert driving

Answer: B — To exhaust air quickly from brake chambers close to the wheels when the pedal is released, preventing brake drag and delay

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