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Which component generates the hydraulic pressure?

  • A.The wheel cylinder, whose piston is moved by the pedal effort and therefore raises the pressure within the system
  • B.The servo
  • C.The proportioning valve, which regulates the pressure delivered to the rear brakes according to the load carried
  • D.The master cylinder

Answer: D

The master cylinder converts the pedal force into fluid pressure, and its bore size sets the relationship between pedal travel and pressure. The servo multiplies the input force before it reaches the master cylinder. Wheel cylinders receive pressure rather than create it. Naming what changes and what stays the same is the reliable route through questions of this shape. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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