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Which disadvantage does a beam front axle have?

  • A.It cannot be steered
  • B.It requires a kingpin at each end, which introduces friction and therefore makes the steering heavy to operate
  • C.A disturbance at one wheel affects the other
  • D.A high unsprung mass only, which affects the ride comfort but has no effect upon the handling of the vehicle

Answer: C

Because the wheels are rigidly connected, a bump under one tilts the axle and changes the camber of both, and the gyroscopic reaction can produce steering wheel shake. Unsprung mass is also high. Independent suspension removes both problems. Most errors here come from carrying across a result from a neighbouring case where it does not hold. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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