Practice question

Why do most heavy goods vehicles use full air (pneumatic) braking systems rather than ordinary hydraulic brakes?

  1. Air systems are cheaper to fit on the production line
  2. Compressed air from an engine-driven compressor provides the large, continuously renewed braking force heavy vehicles require
  3. Hydraulic fluid is banned in Botswana
  4. Air brakes never need any maintenance

Answer: B — Compressed air from an engine-driven compressor provides the large, continuously renewed braking force heavy vehicles require

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