Practice question

What is the function of the red octagonal push-pull knob on a truck tractor dashboard?

  1. Emergency passenger ejection
  2. Trailer air supply valve (push to supply air to trailer, pull to shut off trailer supply and set trailer emergency brakes)
  3. Fuel tank switch valve
  4. Cabin air conditioning booster

Answer: B — Trailer air supply valve (push to supply air to trailer, pull to shut off trailer supply and set trailer emergency brakes)

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