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Which component isolates suspension noise from the body?

  • A.The damper top mounting only, which is the sole path by which the suspension movement reaches the body structure
  • B.The spring
  • C.The subframe, whose mass absorbs the vibration before it can be transmitted into the passenger compartment
  • D.Rubber bushes at the suspension mountings

Answer: D

Rubber bushes at every pivot and mounting break the metal path and absorb high frequency vibration. Their compliance also allows a controlled deflection under load. Stiffer bushes sharpen the response and increase the noise. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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