Abs Warning Light; Hydraulic Unit Assembly; Hydraulic Control Valve - Yamaha FZ8NA Service Manual

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ABS warning light

The ABS warning light "1" comes on to warn the rider if a malfunction in the ABS occurs.
When the main switch is turned to "ON", the ABS warning light comes on for 2 seconds, then goes
off, so that the rider can check if the ABS warning light is disconnected and check if the ABS is oper-
ating properly.
ECA4B56001
If the rear wheel is raced with the vehicle on the sidestand, the ABS warning light may flash
or come on. If this occurs, turn the main switch to "OFF", then back to "ON". The ABS oper-
ation is normal if the ABS warning light comes on for 2 seconds, then goes off.

Hydraulic unit assembly

The hydraulic unit assembly "1" is composed of hydraulic control valves (each with a outlet solenoid
valve and inlet solenoid valve), buffer chambers, hydraulic pumps, an ABS motor, and ABS ECU.
The hydraulic unit adjusts the front and rear wheel brake fluid pressure to control the wheel speed
according to signals transmitted from the ABS ECU.

• 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 sole-
noid valve "2" is closed. The brake line between the brake master cylinder and brake caliper is
open.
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FEATURES

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