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Which sensor does an anti-lock braking system rely on?

  • A.A deceleration sensor only
  • B.A load sensor at each axle, which determines the maximum braking force that the wheel can transmit to the road
  • C.A wheel speed sensor at each wheel
  • D.A pressure sensor in each brake line, which detects the point at which the wheel is about to lock and stop turning

Answer: C

Comparing the speeds of the four wheels reveals a wheel decelerating far faster than the others, which indicates impending lock. Deceleration sensors are used on some four wheel drive systems as an addition. Wheel speed is the fundamental input. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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