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The valve that traps manifold depression so that assistance remains after the engine stops is the _____.

  • A.proportioning valve, which instead limits the pressure delivered to the rear brakes in order to prevent rear lock
  • B.residual pressure valve
  • C.unloader valve, which belongs to a compressed air system and releases the compressor when the pressure is reached
  • D.non return valve

Answer: D

The one way valve in the servo hose holds the vacuum so one or two assisted applications remain available after the engine has stopped. Its failure is detected by the immediate loss of that reserve. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming what changes and what stays the same is the reliable route through questions of this shape.

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