Practice question

Why does uncoupling matter in combination-vehicle operation?

  1. Use the hand valve as the only parking brake
  2. Safe uncoupling requires a secured trailer, lowered landing gear, disconnected lines, released fifth wheel, and slow pullout with stability checks.
  3. Pull away before lowering landing gear
  4. Leave air lines dragging on the ground

Answer: B — Safe uncoupling requires a secured trailer, lowered landing gear, disconnected lines, released fifth wheel, and slow pullout with stability checks.

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