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Which cause commonly produces disc thickness variation?

  • A.Incorrect wheel nut torque, which distorts the hub and therefore causes the disc to wear unevenly during service
  • B.Uneven pad deposits from careless bedding in
  • C.Warping of the disc from heat, which is the invariable explanation for the pulsation felt through the pedal
  • D.Corrosion only

Answer: B

Most so called warping is actually uneven transfer of friction material onto the disc, which produces thickness variation and pulsation. Uneven wheel nut torque genuinely does distort discs, so the last option is a real secondary cause. Actual thermal warping is rare. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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