Practice question

For an Ohio Class A CDL applicant, what is the danger of using the trailer hand valve as a parking brake?

  1. The trailer hand valve cannot supply enough pressure
  2. Air can leak out and release the trailer brakes, allowing the trailer to roll
  3. The kingpin will disengage
  4. The fifth wheel will tilt

Answer: B — Air can leak out and release the trailer brakes, allowing the trailer to roll

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