Yamaha 2007 XP500 Service Manual page 14

ABS block diagram
1. Rear brake master cylinder
2. Hydraulic unit
3. Hydraulic pump
4. ABS motor
5. Buffer chamber
6. Hydraulic control valve
7. Front brake master cylinder
EAS15B1005
Useful terms
Wheel speed:
G
The rotation speed of the front and rear wheels.
Chassis speed:
G
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:
G
The force applied by braking to reduce the wheel speed.
Wheel lock:
G
A condition that occurs when the rotation of one or both of the wheels has stopped but the vehicle
continues to travel.
Side force:
G
The force on the tires which supports the vehicle when cornering.
Slip ratio:
G
When the brakes are applied, slipping occurs between the tires and the road surface. This causes a
difference between the wheel speed and the chassis speed. Slip ratio is the value that shows the rate
of wheel slippage and is defined by the following formula.
Chassis speed
– Wheel speed
Slip ratio =
Chassis speed
8. Rear brake caliper
9. Front brake caliper
10. ECU (ABS)
11. Rear wheel sensor
12. Front wheel sensor
13. ABS warning light
× 100 (%)
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FEATURES