Practice Quiz

Commercial Driver's License

Category - Standard Driving

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Some commercial vehicles have a device known as a wig-wag. What is a wig-wag?
  1. The brake pedal
  2. A device used to set the spring brakes by hand
  3. A mechanical arm that appears when air pressure drops below 60 psi
  4. None of the above
Explanation
Answer: C - A wig-wag is a mechanical arm that drops when the air pressure falls below 60 psi. The device is not seen in all vehicles, but all drivers should know what they are and what they do. If the arm appears, drivers must stop the vehicle as soon as possible and check the air brake system for defects. Failure to do so could lead to complete loss of braking ability.
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