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Which limit ultimately determines the shortest possible stopping distance?

  • A.The pedal effort
  • B.The rate at which heat can be dissipated from the disc, which limits the deceleration that may be sustained
  • C.The friction available between tyre and road
  • D.The clamping force of the caliper, which determines the torque that the brake is able to apply to the wheel

Answer: C

However powerful the brake, the vehicle cannot decelerate faster than the tyre can transmit force to the road. Bigger brakes buy fade resistance rather than a shorter first stop. Heat dissipation limits repeated stops, which is a real but different constraint. The shared behaviour explains why these belong together and the differences explain why both exist. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

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