BMW S 1000XR Rider's Manual page 117

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
handbrake lever.
When the handbrake 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 handbrake 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
Even under severe braking, a
high level of tyre 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
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.
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.
In addition to problems with the
BMW Motorrad Race ABS, ex-
ceptional riding conditions can
lead to a fault message being is-
sued.
Exceptional riding
conditions:
Heating up with the motorcycle
on an auxiliary stand, in neutral
or with a gear engaged.
Rear wheel locked by the en-
gine brake for a lengthy period,
for example while descending
steep gradients.
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