Practice question

For the Washington CDL Air Brakes knowledge test, what does the air pressure gauge tell the driver?

  1. The engine oil pressure
  2. The pressure available in each air storage tank (or each system in a dual setup)
  3. Speed of the compressor
  4. Trailer weight

Answer: B — The pressure available in each air storage tank (or each system in a dual setup)

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Practice more: Washington CDL Air Brakes Test Practice Questions - Washington Commercial Driver License (CDL) Air Brakes Knowledge Test Exam →