Practice question

What causes 'brake fade' on a heavy commercial vehicle descending a long slope?

  1. Excess air entering the tyres from the road surface
  2. Excessive heat generated by continuous friction causing brake drum expansion, lining glazing, and severe reduction in stopping friction
  3. Cold air flowing over the brake shoes
  4. The engine running out of diesel fuel

Answer: B — Excessive heat generated by continuous friction causing brake drum expansion, lining glazing, and severe reduction in stopping friction

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