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Which condition produces brake fade?

  • A.Contamination of the linings with oil, which reduces the coefficient of friction and therefore the braking effort
  • B.Air in the system
  • C.Water on the discs, which forms a film between the pad and the disc and therefore reduces the friction generated
  • D.Overheating of the friction material

Answer: D

Above a certain temperature the binder in the friction material decomposes and gives off gas, which reduces the coefficient of friction sharply. Contamination and water reduce friction too but are not fade. Recovery follows once the brake cools. The shared behaviour explains why these belong together and the differences explain why both exist. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The shared properties explain why these belong to one family, and the differences explain why more than one exists.

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