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Which arrangement does a modern master cylinder use?

  • A.Tandem, with two pistons serving two independent circuits
  • B.A single piston serving all four wheels, which ensures that the braking effort is distributed equally between them
  • C.Three pistons
  • D.Two entirely separate cylinders operated by a balance bar, which permits the front to rear balance to be adjusted

Answer: A

A tandem cylinder has two pistons in one bore feeding two circuits, so a leak in one still leaves the other operative. Dual circuits are a legal requirement. Balance bars with twin cylinders are a competition arrangement. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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