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Which fault causes the toe to change as the suspension moves?

  • A.A worn track rod end, which permits the wheel to move independently of the steering and therefore alters the toe
  • B.Incorrect castor
  • C.A bent steering arm, which alters the relationship between the two wheels but not the toe of either separately
  • D.Bump steer arising from incorrect track rod geometry

Answer: D

If the track rod does not swing on the same arc as the suspension arm, the toe changes throughout the travel and the vehicle steers itself over bumps. It is a geometry error, often introduced by lowering a vehicle without correcting the linkage. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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