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Which failure symptom does an air suspension leak produce?

  • A.The vehicle settles when parked and the compressor runs frequently
  • B.A harsh ride, which follows from the reduced volume of air remaining within the spring after the leak has occurred
  • C.Excessive roll
  • D.A raised ride height, which occurs because the levelling valve admits additional air in order to compensate

Answer: A

A leaking bellows or valve lets the vehicle sink overnight and forces the compressor to run repeatedly, which eventually burns it out. Soapy water finds the leak. Compressor failure from an unrepaired leak is the expensive secondary consequence. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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