BMW S 1000RR Rider's Manual page 165

ing force accordingly to achieve
optimum braking.
What feedback does
the rider receive from
the BMW Motorrad
Race ABS?
If the ABS has to reduce braking
force on account of the circum-
stances described above, vibra-
tion is perceptible through the
brake lever.
When the brake lever is pulled,
brake pressure is also built up
at the rear wheel by the integral
function. If the brake pedal is
depressed after the brake lever
is pulled, the brake pressure built
up beforehand is perceptible as
counter-pressure sooner than is
the case when the brake pedal is
depressed either before or at the
same time as the brake lever is
pulled.
Rear wheel lift
Where there is a high level of
adhesion between the tyres
and road, the front wheel is
only blocked very late or not at
all even when the brakes are
applied forcefully. Consequently,
ABS does not intervene until
very late, if at all. Under these
circumstances the rear wheel
can lift off the ground, and the
outcome can be a highsiding
situation in which the motorcycle
can flip over.
WARNING
Rear wheel lift due to severe
braking
Risk of falling
When you brake sharply, bear
in mind that ABS control can-
not always be relied on to pre-
vent the rear wheel from lifting
clear of the ground.
What is the design
baseline for ABS?
Within the limits imposed by
physics, the ABS ensures dir-
ectional stability on any surface.
The system is not optimised for
special requirements that apply
under extreme competitive situ-
ations on the track. The driving
behaviour should be adapted to
actual driving skills and the road
conditions.
Special situations
The speeds of the front and rear
wheels are compared as one
means of detecting a wheel's
incipient tendency to lock. If
the system registers implaus-
ible values for a lengthy period
the ABS function is deactivated
for safety reasons and an ABS
fault message is issued. Self-dia-
gnosis has to complete before
fault messages can be issued.
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