Practice question

What is the safest CDL action related to uncoupling?

  1. Pull away before lowering landing gear
  2. Leave air lines dragging on the ground
  3. Use the hand valve as the only parking brake
  4. Secure the trailer, lower landing gear, disconnect and stow lines, release the fifth wheel, and pull out slowly

Answer: D — Secure the trailer, lower landing gear, disconnect and stow lines, release the fifth wheel, and pull out slowly

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