Practice question

Before uncoupling a trailer, what must be ensured?

  1. The trailer is on a slope facing downhill
  2. Trailer park brakes are applied and the area is secure before disconnecting air and electrical lines
  3. The engine is revving
  4. Only the driver needs to leave the vehicle

Answer: B — Trailer park brakes are applied and the area is secure before disconnecting air and electrical lines

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