GSF1200AK6/SAK6 (’06-MODEL) 11
HYDRAULIC UNIT SOLENOID VALVES (INLET/OUTLET)
The solenoid valves switch the brake fluid circuit to one of three positions (increasing, decreasing and main-
taining pressure) according to the signal that is output from the ABS control unit. As the ABS control unit
energize the coil, the valve compresses its spring and open/close the circuit.
PRESSURIZED BRAKE FLUID CIRCUIT
The brake fluid circuit of the ABS is divided into two systems: one for the front wheel and one for the rear
wheel. Both the front and rear brake systems are the same.
WHEN NOT OPERATING THE ABS (WHEN THE ABS IS NOT ACTIVATED OR AN ABS MALFUNCTION
HAS OCCURRED)
Brake fluid pressure-increasing mode
When the ABS is not activated, the solenoid valve coils are not energized (no signal is sent from the ABS
control unit). In this case, the inlet valve is open and the outlet valve is closed. The pressurized brake fluid
travels from the master cylinder to the brake caliper through the opened inlet valve.
OUT/V
(Closed)
IN/V
(Opened)
OUT/V
(Closed)
IN/V
(Closed)
OUT/V
(Opened)
IN/V
(Closed)
Pressure-decreasing mode
Pressure-maintaining mode
When ABS is not activated,
Pressure-increasing mode
Normal
position
Coil
Valve
Spring
Reservoir
Brake
caliper
Master
cylinder
OUT/V: Outlet solenoid valve
IN/V: Inlet solenoid valve
Valve
Valve
Spring
Spring
Energized
position
Energized
position
Energized
position
Normal
position
Normal
position
ValveValve
Valve
Master
cylinder
Master
cylinder
Brake
caliper
Brake
caliper
Reservoir
Reservoir
CoilCoil
Brake operation
Brake
caliper
Pump
Motor:
OFF
Reservoir
Solenoid valve
Time
Fluid pressure
at brake caliper
Inlet:
OFF
Outlet:
OFF
Signal Fluid circuit
IN/V OFF Open
OUT/V OFF Close
SAMPLE
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