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Which of the following is not part of an anti-lock braking system?

The vacuum servo

The wheel speed sensors

The hydraulic modulator

The electronic control unit

  • A.The hydraulic modulator
  • B.The electronic control unit
  • C.The vacuum servo
  • D.The wheel speed sensors

Answer: C

The servo multiplies the driver's effort and exists on vehicles with no anti-lock system at all. Sensors, modulator and controller are the three anti-lock elements. Knowing which parts belong to which system speeds up diagnosis. Naming what changes and what stays the same is the reliable route through questions of this shape. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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