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Which alignment measurement requires the vehicle to be turned on lock?

  • A.Camber
  • B.Castor, which is measured with the wheel in the straight ahead position and the vehicle standing upon a level surface
  • C.Toe out on turns
  • D.Toe, which is measured with the steering held in the straight ahead position and the vehicle at its normal height

Answer: C

Toe out on turns checks the Ackermann geometry by measuring the angle of the inner wheel when the outer is turned to a specified angle. An error indicates a bent steering arm. Castor is in fact measured by turning the wheel through twenty degrees each way, which makes the last option misleading. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Checking which component actually carries the load settles most questions of this kind at once.

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