Practice question

Why should you never depress the brake pedal when the spring parking brakes are fully applied?

  1. It will blow the vehicle horn loudly
  2. It causes 'compounding'—combining spring force with air chamber force, which can bend pushrods, rupture chambers, or crack brake drums
  3. It causes diesel fuel to spray onto the tyres
  4. It disables the power steering pump

Answer: B — It causes 'compounding'—combining spring force with air chamber force, which can bend pushrods, rupture chambers, or crack brake drums

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