out). Attempted burn-outs
can result in damage to the
rear brake and the clutch.
Do not attempt burn-outs.
How does ABS work?
The amount of braking force
that can be transferred to
the road depends on factors
hat include the coefficient of
friction of the road surface.
Loose stones, ice and snow
or a wet road all have much
lower coefficients of friction
than a clean, dry asphalt sur-
face. The lower the coeffi-
cient of friction, the longer the
braking distance.
If the rider increases braking
pressure to the extent that
braking force exceeds the
maximum transferrable limit,
the wheels start to lock and
the motorcycle loses its dir-
ectional stability; a fall is im-
minent. Before this situation
can occur, ABS intervenes
and adapts braking pressure
to the maximum transferrable
braking force, so the wheels
continue to turn and direc-
tional stability is maintained
irrespective of the condition of
the road surface.
What are the effects of
surface irregularities?
Humps and surface irregu-
larities can cause the wheels
to lose contact temporarily
with the road surface; if this
happens the braking force
that can be transmitted to
the road can drop to zero.
If the brakes are applied un-
der these circumstances the
ABS has to reduce braking
force to ensure that direc-
tional stability is maintained
when the wheels regain con-
tact with the road surface.
At this instant the BMW Mo-
torrad Integral ABS must as-
sume an extremely low coef-
ficient of friction, so that the
wheels will continue to rotate
under all imaginable circum-
stances, because this is the
precondition for ensuring dir-
ectional stability. As soon as
is registers the actual circum-
stances, the system reacts
instantly and adjusts braking
force accordingly to achieve
optimum braking.
What feedback does the
rider receive from the
BMW Motorrad Integral
ABS?
If the ABS system has to re-
duce braking force on ac-
count of the circumstances
described above, vibration is
perceptible through the hand-
brake lever.
When the handbrake lever is
pulled, brake pressure is also
5
87
z
Riding
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