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Which consequence follows if the rear brakes lock before the front?

  • A.Nothing significant
  • B.The front wheels lose their steering effect, which prevents the driver from correcting the path of the vehicle
  • C.The vehicle becomes directionally unstable and may spin
  • D.The stopping distance is shortened, which is why some competition vehicles are set up in exactly this manner

Answer: C

A locked rear axle generates no lateral force, so the rear swings and the vehicle spins. It is precisely why proportioning valves exist and why front bias is universal. Front lock merely produces understeer and a straight slide. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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