Yamaha 2007 FZ6-NA Service Manual

Contents

FEATURES1-15Hydraulic unitThe hydraulic unit “1” is composed of three hydraulic control valves (each with a solenoid valve andflow control valve), two buffer chambers, two hydraulic pumps, and an ABS motor. The hydraulic unitadjusts the front and rear wheel brake fluid pressure to control the wheel speed according to signalstransmitted from the ABS ECU.• Hydraulic control valveThe hydraulic control valve is composed of a flow control valve and solenoid valve.When the ABS is activated, the flow control valve regulates the flow of brake fluid to the brake andthe solenoid valve decreases and increases the brake fluid pressure.1.When the brakes are operated normally, the solenoid valve “2” is closed, the spool “3” of the flowcontrol valve does not move, and the hydraulic line between the brake master cylinder and brakecaliper is open.2.When the ABS is activated, the solenoid valve “2” is opened by the power supplied from the ABSECU signals to decrease the brake fluid pressure and the spool “3” of the flow control valve ismoved toward the solenoid valve.3.When the ABS ECU stops transmitting signals to decrease the brake fluid pressure, the solenoidvalve “2” closes and the brake fluid is pressurized again. Pressurizing the brake fluid again, whilethe ABS is activated, limits the flow of the brake fluid with the movement of the flow control valvespool “3” and provides a gradual pressure increase.1. To the rear brake master cylinder2. Hydraulic pump3. ABS motor4. Buffer chamber5. Hydraulic control valve6. To the front brake master cylinder7. To the rear brake caliper8. To the ABS ECU9. To the front brake caliper