BMW S 1000XR Rider's Manual page 111

ditions, the system adjusts the
optimum brake pressure.
In what ways is the
BMW Motorrad Race ABS
noticeable to the rider?
If the ABS system must reduce
the braking force due to the con-
ditions described above, then
vibrations can be felt through the
handlebar brake lever.
If the handbrake lever is pulled,
then braking pressure is built up
at the rear wheel with the integral
function. If the footbrake lever is
first actuated after this, the brake
pressure already built up can be
felt earlier than the counter-pres-
sure, than when the footbrake
lever is actuated before or to-
gether with the handbrake lever.
Lifting off rear wheel
Even during severe braking, a
high level of tire grip can mean
that the front wheel does not
lock up until very late, if at all.
Consequently, ABS does not in-
tervene until very late, if at all.
Under these circumstances the
rear wheel can lift off the ground,
and the outcome can be a high-
siding situation in which the mo-
torcycle can flip over.
WARNING
Lifting off of the rear wheel
due to heavy braking.
Accident hazard
When braking heavily, bear in
mind that the ABS control can-
not always be relied on to pre-
vent the rear wheel from lifting
off the ground.
Special situations
To detect the tendency of the
wheels to lock up, the speeds
of the front and rear wheel are
compared. If implausible values
are detected over an extended
period of time, the ABS function
is deactivated for safety reasons
and an ABS fault is indicated. A
self-diagnosis routine must be
completed before the error will
be displayed.
Apart from problems on the
BMW Motorrad Race ABS,
unusual riding conditions can
also cause a fault message to be
generated.
Unusual riding conditions:
Heating up on an auxiliary
stand at idle speed or with gear
engaged.
Rear wheel locked-up for a
longer period of time by engine
brake, e.g. when riding down
steep hills.
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