Practice question

For the Washington CDL Air Brakes knowledge test, how long should it take for an air brake system to build pressure from 85 psi to 100 psi at engine governed RPM?

  1. About 45 seconds
  2. Not more than 45 seconds (typical FMCSA guideline)
  3. About 5 minutes
  4. About 15 seconds

Answer: B — Not more than 45 seconds (typical FMCSA guideline)

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