Practice question

Some older air-brake vehicles use a wig-wag warning device. What should an Arkansas CDL applicant know about it?

  1. It is a trailer coupling device
  2. It is a mechanical low-air warning that drops into view when pressure gets too low
  3. It is the same as the yellow parking knob
  4. It increases air pressure when the compressor fails

Answer: B — It is a mechanical low-air warning that drops into view when pressure gets too low

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