Practice question

What is the correct procedure to test the air loss rate (prueba de estanqueidad / fuga de aire) during a pre-trip inspection of an air brake system?

  1. Rev the engine to maximum RPM and listen for exhaust leaks
  2. Turn off the engine, release the parking brake, fully apply the service brake pedal, hold it down for 1 minute, and verify that air pressure drops no more than the allowable limit (typically <0.2 bar / 3 psi for single vehicles, <0.3 bar / 4 psi for combinations)
  3. Drive at 50 km/h and pull the parking brake valve suddenly
  4. Open all drain valves completely while driving

Answer: B — Turn off the engine, release the parking brake, fully apply the service brake pedal, hold it down for 1 minute, and verify that air pressure drops no more than the allowable limit (typically <0.2 bar / 3 psi for single vehicles, <0.3 bar / 4 psi for combinations)

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