Practice question

What is the correct procedure for testing the air brake leakage rate during a pre-trip inspection?

  1. Shut off the engine with full air pressure, release parking brakes, hold down the foot brake for 1 minute, and verify air pressure loss does not exceed 3 PSI (single) or 4 PSI (combination)
  2. Pump the brake pedal 50 times with engine running at maximum RPM
  3. Turn off the air compressor and drive for 10 kilometres
  4. Listen for leaks while playing the radio at high volume

Answer: A — Shut off the engine with full air pressure, release parking brakes, hold down the foot brake for 1 minute, and verify air pressure loss does not exceed 3 PSI (single) or 4 PSI (combination)

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