Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 2000-2003 Approved Subaru Legacy 2000 2000 Service Manual MECHANISM AND FUNCTION SECTION Brakes MSA5TCD00L18224

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        LEGACY (W2260BE_SGML Complete)

                         MECHANISM AND FUNCTION         [M500]      4-4
                                                  5. Proportioning Valve

5. Proportioning Valve



                         LEGACY (W2260BE_SGML Complete)

4-4      [M5A0]                  MECHANISM AND FUNCTION
5. Proportioning Valve

1) Operation before the split point
Piston is held by spring so that valve is kept away from valve seat.
Under this condition, fluid pressure "P3" to rear wheel cylinders equals fluid pressure "P2" from
master cylinder.


2) Operation near the split point
D Force "f1", applied to piston by spring, is one-half of spring force "F". In other words, "f1" = "F".
D Force "f2" is also applied to piston in the direction opposite to spring force "F" due to fluid pres-
sure "P2" generated by master cylinder according to cross sectional area "A".
D Force "f2" increases respondingly with fluid pressure "P2". When "f2" is greater than, piston
moves in direction opposite to spring force "F". This causes valve to come in contact with valve
seat, blocking fluid passage.


             LEGACY (W2260BE_SGML Complete)

                              MECHANISM AND FUNCTION                                 [M5A0]      4-4
                                                                               5. Proportioning Valve

3) 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 "P3", pres-
sure "P3" is held at a value of less than pressure "P2".


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