Practice Quiz

Commercial Driver's License

Category - Class A

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When connecting doubles or triples, one of the last steps is to check the air pressure for the last trailer's air brakes. You do this by:
  1. Taking a quick test drive and applying the brakes
  2. Disengaging one air hose and listening for leaks
  3. Pushing the "air supply" button on the rear of the last trailer to see if it has pressure
  4. None of the above
Explanation
Answer: C - When connecting doubles or triples, it is imperative that drivers check the air pressure for the last trailer's brakes. Drivers perform this action by pressing the "air supply" button that is found on the rear of the last trailer. There should be air pressure in the system. If not, have the system inspected before moving the trailer. Low or no air pressure will cause the brakes to malfunction.
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