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Which boiling point falls as brake fluid absorbs water?

  • A.The flash point, which is the temperature at which the vapour given off by the fluid will ignite in the presence of air
  • B.The wet boiling point
  • C.The dry boiling point, which is measured with fresh fluid and therefore represents the condition after absorption
  • D.Both remain constant

Answer: B

Specifications quote a dry boiling point for fresh fluid and a wet one for fluid containing three and a half per cent water, and the wet figure is far lower. The distinction inverts the second option. A refractometer or an electronic tester measures the condition. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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