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Which component limits the steering lock of a front wheel drive car?

  • A.The track rod
  • B.The steering box, whose sector shaft can rotate through only a limited angle before the mesh runs out of teeth
  • C.The angular limit of the outer constant velocity joint
  • D.The length of the rack, which cannot travel beyond the ends of its housing and therefore restricts the movement

Answer: C

An outer constant velocity joint accepts around forty five degrees, and beyond that it binds and eventually fails. Rack travel is set to suit and is limited by stops. This is why front wheel drive cars often have poorer turning circles than rear wheel drive ones. The order in which the effects act is what decides the outcome, so it is worth establishing first. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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