Hino 600, Workshop Manual, Page: 396 / 451

ABS (ABS : HYDRAULIC (E VERSION)) BR03–12
b. During Pressure Maintenance
•
When the wheel cylinder fluid pressure is reduced or increased to the
required fluid pressure, the pressure maintenance solenoid valve port
A and the pressure reduction solenoid valve port B simultaneously
close according to control signals from the ABS ECU. This closes
both the Hydro booster side and reservoir side oil routes, maintaining
the wheel cylinder fluid pressure.
Each Port Status
ABS ECU signal Port status
Pressure mainte-
nance solenoid valve
ON Port A : Closed
Pressure reduction
solenoid valve
OFF Port B : Closed
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