Practice Quiz

Commercial Driver's License

Category - Class A

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The acceptable air pressure loss in a combination vehicle with a fully charged air system is?
  1. Less than 3 psi a minute
  2. Less than 2 psi a minute
  3. Less than 4 psi a minute
  4. None of the above
Explanation
Answer: A - In a combination vehicle with a fully charged air system the acceptable loss of air pressure is less than 3 psi per minute. This test is performed by turning off the engine and releasing the parking brake, then measuring the loss of air pressure within a one minute period. This test is almost always a part of the CDL exam, and because of its importance should always be conducted during pre-trip inspections on ALL vehicles that utilize air brakes.
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