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Which purpose does bleeding a brake system serve?

  • A.Removing the contamination that accumulates within the caliper, which would otherwise damage the seals in service
  • B.Removing air from the hydraulic circuit
  • C.Removing water from the fluid, which lowers the boiling point and must therefore be extracted before it boils
  • D.Adjusting the pedal

Answer: B

Air is compressible, so any trapped in the system produces a spongy pedal and reduced effectiveness. Water is removed by a fluid change rather than by bleeding, although the operations use the same equipment. The distinction is worth keeping. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The shared behaviour explains why these belong together and the differences explain why both exist. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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