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Which action is required after mineral oil enters a brake system?

  • A.Replacement of every seal and flexible hose in the system
  • B.Flushing the system with fresh brake fluid, which removes the contamination and restores the system to service
  • C.Topping up only
  • D.Replacement of the master cylinder alone, since the contamination cannot pass beyond it into the rest of the system

Answer: A

Every rubber component that has contacted the oil is swollen and must be replaced, which usually means the whole system. Flushing does not reverse the swelling. It is an expensive lesson in reading the label. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Checking which component actually carries the load settles most questions of this kind at once. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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