Practice question

Before uncoupling a semi-trailer from a tractor, what should the driver do first?

  1. Release the fifth-wheel lock immediately at the delivery point
  2. Park on firm, level ground, apply the parking brakes and make sure the trailer is supported
  3. Disconnect the air lines so the trailer brakes release
  4. Drive forward slowly while a colleague lowers the landing gear

Answer: B — Park on firm, level ground, apply the parking brakes and make sure the trailer is supported

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