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Which component is still required alongside an air spring?

  • A.A coil spring, which supports the vehicle if the air supply should fail and therefore acts as a safety provision
  • B.A torsion bar
  • C.A bump stop only, since the air spring itself provides sufficient damping through the throttling of the air within it
  • D.A telescopic damper

Answer: D

An air spring has very little inherent damping, so telescopic dampers are fitted exactly as with a steel spring. Emergency support on failure is provided by a rubber stop rather than a coil. Damping is the invariable requirement. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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