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Which role does a modern bump stop perform beyond limiting travel?

  • A.It acts as a progressive supplementary spring
  • B.It damps the movement of the suspension, which reduces the load upon the damper during the last part of the travel
  • C.It locates the wheel
  • D.It supports the vehicle when it is stationary, which relieves the main spring and therefore extends its service life

Answer: A

Microcellular urethane stops are shaped to engage early and stiffen progressively, allowing a soft main spring with adequate control at large deflections. They are a designed part of the spring rate curve, not merely an emergency stop. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Tracing the requirement back to the physical constraint that produces it makes the answer follow. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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