Yamaha 2009 Diversion XJ6S Service Manual page 22

Hydraulic control valve
The hydraulic control valve is composed of a inlet solenoid valve and outlet solenoid valve.
The electromagnetic force generated in the inlet solenoid valve varies proportionally with the duty cycle
control voltage that is supplied to it. Since this voltage is continuously variable, the solenoid valve
moves smoothly and the hydraulic pressure is adjusted linearly.
1. When the brakes are operated normally, the inlet solenoid valve "1" is open and the outlet solenoid
valve "2" is closed. The brake line between the brake master cylinder and brake caliper is open.
2. When the ABS is activated, the inlet solenoid valve "1" closes and the outlet solenoid valve "2" opens
using the power supplied from the ABS ECU signals. This reduces the hydraulic pressure.
3. When the ABS ECU sends a signal to stop reducing the hydraulic pressure, the outlet solenoid valve
"2" closes and the brake fluid is pressurized again. The inlet solenoid valve "1" controls the hydraulic
pressure difference between the brake fluid in the upper brake lines (brake master cylinder side) and
the brake fluid in the lower brake lines (brake caliper side).
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