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Which consequence follows from the absence of self servo action?

  • A.Higher pedal effort but more predictable response
  • B.Lower pedal effort, since the caliper multiplies the applied force through the action of its hydraulic piston
  • C.Faster wear
  • D.A greater tendency to fade, which follows from the higher pressure required at the friction interface to stop

Answer: A

Without self servo the braking force is directly proportional to the pressure applied, which makes the brake linear and easy to modulate. The cost is a higher pedal effort, which the vacuum servo supplies. Predictability is what makes anti-lock control practical. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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