Yamaha XP500 Service Manual page 19

Brake force
Side force
EAS00876
ABS operation and vehicle control
If the ABS starts operating, there is a tendency
of the wheel to lock, and the vehicle is
approaching the limit of control. To make the
rider aware of this condition, the ABS has been
designed to generate a reaction-force pulsat-
ing action in the brake lever.
NOTE:
_
When the ABS is activated, a pulsating action
may be felt at the brake lever, but this does not
indicate a malfunction.
The higher the cornering force on a tire, the
less traction there is available for braking. This
is true whether the vehicle is equipped with an
ABS or not. Therefore, sudden braking while
cornering is not recommended. Excessive cor-
nering force, which an ABS cannot prevent,
Slip ratio (%)
could cause the tire to slip sideways.
_
The braking of the vehicle, even in the
worst case, is principally executed when
the vehicle is advancing straight ahead.
During a turn, sudden braking is liable to
cause a loss of traction of the tires. Even in
vehicles equipped with an ABS, overturn-
ing of the vehicle cannot be prevented if it
is braked suddenly.
The ABS functions to prevent the tendency of
the wheel to lock by controlling the brake
hydraulic pressure. But, if there is a tendency
of the wheel to lock on a slippery road surface,
due to engine braking, the ABS may not be
able to prevent the wheel from locking.
_
The ABS controls only the tendency of the
wheel to lock caused by applying the
brakes. The ABS cannot prevent wheel lock
on slippery surfaces, such as ice, when it is
caused by engine braking, even if the ABS
is operating.
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