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Which check reveals kingpin wear?

  • A.Measuring the toe
  • B.Checking the free play at the steering wheel, which increases as the kingpin bushes wear during normal service
  • C.Lifting the wheel and rocking it top and bottom
  • D.Rocking the wheel from side to side at the front and rear, which reveals any play within the steering linkage

Answer: C

With the wheel raised, grasping it at top and bottom and rocking reveals vertical play at the kingpin, while rocking front to rear reveals track rod play. The two checks isolate different components. An assistant applying the brake distinguishes bearing play from kingpin play. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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