Practice question

In a full air-brake system, what happens if air pressure is suddenly lost through a serious leak?

  1. The vehicle coasts freely with no brakes at all
  2. The wheels lock only on the steering axle
  3. Nothing changes until the next service
  4. Powerful spring brakes apply automatically as pressure falls, acting as a fail-safe

Answer: D — Powerful spring brakes apply automatically as pressure falls, acting as a fail-safe

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