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Which fade mechanism involves the brake fluid rather than the lining?

  • A.Vapour lock from boiling fluid
  • B.Green fade, which occurs when a new lining gives off gas during its first few heavy applications in service
  • C.Water fade
  • D.Mechanical fade, which occurs when the drum expands away from the shoes and therefore reduces the contact area

Answer: A

Boiling fluid produces compressible vapour and the pedal goes to the floor, which is the most dangerous form of fade because pumping does not help. Green fade and drum expansion are genuine mechanisms affecting the friction pair instead. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

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