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Which symptom indicates a failed brake servo?

  • A.A pedal that sinks slowly under steady pressure, which shows that the servo is leaking fluid past its diaphragm
  • B.A hard pedal requiring high effort
  • C.A soft pedal that travels to the floor, which indicates that the assistance is excessive rather than absent
  • D.A pulsating pedal

Answer: B

Without assistance the driver must supply the whole effort and the pedal feels hard while the stopping distance lengthens. A sinking pedal indicates a master cylinder seal. Pulsation indicates a distorted disc. Checking which component actually carries the load settles most questions of this kind at once. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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