Yamaha FZ1-N 2007 Service Manual page 26

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Composition and operation
The ABS motor relay is activated by signals transmitted from the ABS ECU and operates simulta-
neously when the ABS starts to reduce the hydraulic pressure of the brake fluid. If the solenoid relay
is turned off, the ABS motor relay is also deactivated and the motor stops operating if there is a mal-
function.
1. ABS motor relay
2. Solenoid valves
3. ABS ECU
4. Pump motor relay coil
5. Pump motor monitor
6. ABS warning light
EAS5D01003
ABS OPERATION
The ABS hydraulic circuit consists of two systems: the front wheel, and rear wheel. The following
describes the front system only.
Normal braking (ABS not activated)
When the ABS is not activated, port D "11" of the solenoid valve is closed because a control signal
has not been transmitted from the ABS ECU and port A "7" and port B "9" of the flow control valve
are open.
Therefore, when the brake lever is squeezed, the hydraulic pressure in the brake master cylinder
increases and the brake fluid is sent to the brake caliper via port A "7" and port B "9".
At this time, the inlet and outlet check valves of the pump close the lines and brake fluid is not sent.
As a result, the brake master cylinder directly pressurizes the brake caliper during normal braking.
When the brake lever is released, the brake fluid in the brake caliper returns to the brake master cyl-
inder via port A "7" and port B "9".
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7. Front brake solenoid
8. Rear brake solenoid
9. Hydraulic unit
10.Power supply
11.Power of solenoid
12.Power
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FEATURES