Hino 600, Workshop Manual, Page: 395 / 451

ABS (ABS : HYDRAULIC (E VERSION)) BR03–11
(2) During ABS Braking
a.
Pressure Reduction Mode
• When the wheels are about to lock, the pressure maintenance sole-
noid valve port
A closes and the pressure reduction solenoid valve
port B opens according to control signals from the ABS ECU. Accord-
ingly, the wheel cylinder brake fluid is fed through the pressure reduc-
tion solenoid valve port
B to the reservoir, reducing the wheel cylinder
fluid pressure. While the ABS is in operation, the ABS ECU outputs a
normal operating signal to the pump, which pumps out the brake fluid
that accumulates in the reservoir and returns it to the Hydro booster.
Each Port Status
ABS ECU signal Port status
Pressure mainte-
nance solenoid valve
ON Port A : Closed
Pressure reduction
solenoid valve
ON Port B : Open
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