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Which precaution applies while bleeding a brake system?

  • A.The engine must be running, which ensures that the servo assists the operation and therefore expels the air
  • B.The wheels must be removed
  • C.The bleed screw must be opened fully, which allows the air to escape freely along with the fluid being expelled
  • D.The reservoir must not be allowed to empty

Answer: D

If the reservoir empties, air enters the master cylinder and the whole operation begins again. The engine is normally off so the servo does not interfere. Bleed screws are opened only part of a turn. Checking which component actually carries the load settles most questions of this kind at once. 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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