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Which spring permits automatic ride height control?

  • A.The air spring
  • B.The coil spring, whose free length may be altered by fitting spacers beneath it in order to change the ride height
  • C.The leaf spring
  • D.The torsion bar, whose anchor may be rotated in order to raise or lower the vehicle as the load upon it changes

Answer: A

Adding or releasing air changes both the height and the rate, so a levelling valve or an electronic controller can hold the height constant under any load. A torsion bar anchor is a manual adjustment, not an automatic one. Air suspension is standard on buses and coaches. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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