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A driver reports that the brake pedal is firm but the vehicle stops poorly, and the pedal effort required is very high.

Which fault fits best?

  • A.Glazed friction material, which reduces the coefficient of friction and therefore lengthens the stopping distance
  • B.Loss of servo assistance
  • C.Air in the hydraulic system, which would instead produce a pedal that felt soft and travelled further than normal
  • D.A leaking master cylinder

Answer: B

A firm pedal needing high effort is the signature of a failed servo or its vacuum supply. Glazing also reduces effectiveness, which makes it a genuine alternative worth checking, but the high effort points to the assistance. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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