Forester AWD F4-2.5L DOHC (1998)
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Immediately before fluid passage is closed, fluid pressure "P2" is held equal to pressure "P3". When brake pedal is depressed to increase fluid
pressure "P2", piston moves in the same direction as spring force "F", opening fluid passage.
However, since fluid passage is closed again immediately after pressure "P2" equals "P2", pressure "P3" is held at a value of less than pressure
"P2".