Practice question

What is the proper inspection procedure for the trailer service brake during the air-loss test?

  1. Build full air pressure, shut off engine, press and hold service brake, observe pressure drop within NFPA/FMCSA limit
  2. Pump the brake while driving
  3. Disconnect the trailer to test
  4. Skip when temperature is below freezing

Answer: A — Build full air pressure, shut off engine, press and hold service brake, observe pressure drop within NFPA/FMCSA limit

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