Yamaha FJR13AY 2009 Service Manual page 15

ABS layout
2
1
15
1. ABS test coupler
2. ABS warning light
3. ABS ECU fuse
4. ABS solenoid fuse
5. ABS motor fuse
6. Proportioning valve
7. Hydraulic unit assembly (ABS ECU)
8. Rear wheel sensor
ABS
The operation of the Yamaha ABS brakes is the same as conventional brakes on other vehicles, with
a brake lever for operating the front brake and a brake pedal for operating the rear brake. However, part
of the front brake is operated together with rear brake.
When wheel lock is detected during emergency braking, hydraulic control is performed by the hydraulic
system on the front and rear brakes independently.
Useful terms
• Wheel speed:
The rotation speed of the front and rear wheels.
• Chassis speed:
The speed of the chassis.
When the brakes are applied, wheel speed and chassis speed are reduced. However, the chassis
travels forward by its inertia even though the wheel speed is reduced.
• Brake force:
The force applied by braking to reduce the wheel speed.
• Wheel lock:
A condition that occurs when the rotation of one or both of the wheels has stopped, but the vehicle
continues to travel.
• Side force:
The force on the tires which supports the vehicle when cornering.
11
3,4
6
5
6
14 12,13 11
1-6
7
A
7
A
10
9. Rear wheel sensor rotor
10. Rear brake caliper
11. Metering valve
12. Left front brake caliper
13. Right front brake caliper (partially operated
together with the rear brake)
14. Front wheel sensor
15. Front wheel sensor rotor
FEATURES
8
9