Subaru SVX 1992 Manual page 850

4-4 [M5B5] BRAKES
3) Pressure "hold" action with ABS in operation
When wheel cylinder © fluid pressure is decreased or
increased to the optimum point, the controller emits an
instruction so that a hold current of 1 .9 to 2.3 amperes
flows through magnet valve ® . The inlet and outlet
ports will then be closed. At this point, the controlled
fluid pressure is held in the wheel cylinder ®, the fluid
pressure increased by the pump (which increases the
decreased wheel cylinder) is stored in accumulator ~t ,
the fluid pressure increased by brake pedal depression
force is held in master cylinder 1) and the fluid pressure
discharged from the pump is held in reservoir 6@ .
Ffg. 31
4) Pressure-increase action with ABS in operation
When current flowing through magnet valve ® is inter-
rupted (OFF) by an instruction emitted from the E .C.U.,
the fluid pressure of wheel cylinder ® is increased . (At
this point, internal passages of the magnet valve func-
tion the same as in a conventional brake system .) When
the magnet valve ® is OFF, the inlet port is opened and
the outlet port is closed. High fluid pressure is then
delivered from accumulator ® to wheel cylinder ® via
the inlet port so that wheel cylinder pressure is in-
creased . Since check valve © and F-valve 0 remain
sealed by the fluid pressure of master cylinder 1@ and
high fluid pressure of accumulator 0 respectively, only
wheel cylinder ® fluid pressure is increased . Accord-
ingly, a sensation of brake pedal "pull" will not occur.
-1g. 32
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