Practice question

For the Kentucky CDL Combination Vehicles test, which statement is correct about dummy couplers?

  1. Use actual loaded weight instead of GVWR or GCWR for CDL class decisions.
  2. Use the trailer hand valve for normal braking while driving.
  3. Skip the visual coupling inspection after a successful tug test.
  4. Use dummy couplers to keep water and dirt out of air couplers and lines.

Answer: D — Use dummy couplers to keep water and dirt out of air couplers and lines.

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