Brake Force And Vehicle Stability - Yamaha FZ8NA Service Manual

Brake force and vehicle stability

When the brake pressure is increased, wheel speed is reduced. Slipping occurs between the tire
and the road surface and brake force is generated. The limit of this brake force is determined by the
friction force between the tire and the road surface and is closely related to wheel slippage. Wheel
slippage is represented by the slip ratio.
Side force is also closely related to wheel slippage. See figure "A". If the brakes are applied while
keeping the proper slip ratio, it is possible to obtain the maximum brake force without losing much
side force.
ABS allows full use of the tires' capabilities even on slippery road surfaces or less slippery road sur-
faces. See figure "B".
a. Friction force between the tire and road sur-
face
b. Brake force
c. Side force
d. Slip ratio (%)
e. Less slippery road surface
f. Controlling zone
g. Slippery road surface
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