Practice question

What is the typical lag time characteristic of heavy vehicle air brake systems?

  1. Brakes apply instantly with no delay
  2. A short delay between pressing the brake pedal and full brake application at all axles as air pressure travels through the system
  3. Air brakes only work above 60 km/h
  4. Lag time means brakes never need maintenance

Answer: B — A short delay between pressing the brake pedal and full brake application at all axles as air pressure travels through the system

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