CHASSIS - BRAKE
255CH151
Port A
Pressure
Appliance
Valve
Port B
Pressure
Reduction
Valve
To Wheel
Cylinder
255CH152
255CH153
To
Reservoir
From Wheel
Cylinder
255CH159
Port A
Pressure
Appliance
Valve
Port B
Pressure
Reduction
Valve
To Wheel
Cylinder
255CH160
255CH161
To
Reservoir
From Wheel
Cylinder
CH-59
Not Activated
Normal Braking
—
—
Activated
Increase Mode
Holding Mode
Reduction Mode
Hydraulic
Circuit
Front
Pressure
Appliance
Solenoid Valve
(Port A)
ON (Half-Open*)
OFF (Close)
OFF (Close)
Front
Pressure
Reduction
Solenoid Valve
(Port B)
OFF (Close)
OFF (Close)
ON (Half-Open*)
Hydraulic
Circuit
Rear
Pressure
Appliance
Solenoid Valve
(Port A)
ON (Half-Open*)
OFF (Close)
OFF (Close)
Rear
Pressure
Reduction
Solenoid Valve
(Port B)
ON (Close)
ON (Close)
ON (Half-Open*)
Wheel Cylinder Pressure
Increase
Hold
Reduction
*: The solenoid valve constantly regulates the amount of opening of the port in accordance with the use
conditions in order to control the fluid pressure.