Practice question

How can a driver perform a functional test of the trailer's service brakes during a pre-trip inspection?

  1. By driving at 50 kph and checking if the trailer sways
  2. By applying the trailer hand brake (trolley valve) and gently attempting to pull forward in low gear to see if the trailer holds
  3. By checking that the brake pedal has at least 3 inches of free play
  4. By listening for air leaking from the tractor protection valve

Answer: B — By applying the trailer hand brake (trolley valve) and gently attempting to pull forward in low gear to see if the trailer holds

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