Practice question

What is the function of the air-pressure gauge(s) on an air-braked heavy motor vehicle?

  1. To measure engine oil pressure
  2. To show the driver the current air pressure available in the brake system, which is essential for safe braking
  3. To display tyre pressure
  4. To indicate fuel level

Answer: B — To show the driver the current air pressure available in the brake system, which is essential for safe braking

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