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Which behaviour results when the front wheels lock first?

  • A.The vehicle spins, which follows from the loss of lateral force at the front and the consequent yawing moment
  • B.Nothing changes
  • C.The rear wheels lock immediately afterwards, which occurs because the load transfers back onto the rear axle
  • D.The vehicle slides straight ahead without steering response

Answer: D

Locked front wheels cannot steer, so the vehicle ploughs on in a straight line, which is undesirable but stable. Rear lock produces the spin. That asymmetry is why front bias is always chosen. The order in which the effects act is what decides the outcome, so it is worth establishing first. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

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