Suzuki 2006 GSF1200AK6 Supplementary Service Manual page 7

6 GSF1200AK6/SAK6 ('06-MODEL)
RELATIONSHIP BETWEEN THE SLIP RATIO, SIDE FORCE AND THE FRICTION BETWEEN THE TIRE
AND ROAD SURFACE
The relationship between the slip ratio, side force and the friction between the tire and road surface are
shown in the following graph.
* "Side force" is the supporting force on the sides of the motorcycle.
Friction between the tire and road surface is generally at its maximum when the slip ratio is within section B
and the friction becomes lowered when the wheel is locked (100% slip ratio). In addition, since braking
reduces the side force, suddenly braking when there is a large slip ratio reduces the supporting force on the
sides of the motorcycle and decreases the motorcycle's stability. The above graph shows that optimal brak-
ing occurs within section B, where the friction between the tire and road surface is maximum and the side
force is not significantly reduced.
OPTIMAL CONTROL
The brake fluid pressure is adjusted to provide the proper braking force.
While the slip ratio is within section B, the brake fluid pressure is slightly increased, decreased or main-
tained. If the slip ratio enters section C due to changes in road conditions, the brake fluid pressure is quickly
decreased so that the slip ratio returns to section B. If the slip ratio enters section A, the brake fluid pres-
sure is quickly increased so that the slip ratio returns to section B.
It is very difficult for a person to make these types of adjustments quickly and accurately. The ABS, which is
a control system that uses electrical and hydraulic technology, makes these adjustments automatically to
provide the ideal braking force.
The arrows
indicate braking.
0
Slip ratio
Wheel lock point
Side force
100%