BMW HP4 Rider's Manual page 116

beforehand is perceptible as
7
counter-pressure sooner than is
the case when the brake pedal is
114
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-
z
siding situation in which the mo-
torcycle can flip over.
Severe braking can cause
the rear wheel to lift off the
ground.
When you brake, bear in mind
that ABS control cannot always
be relied on to prevent 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.
If a fault message is issued on
account of exceptional riding
conditions as outlined above, you
can reactivate the ABS function
by switching the ignition off and
on again.
What significance
devolves on regular
maintenance?
Invariably, a technical sys-
tem cannot perform beyond
the abilities dictated by its level
of maintenance.
In order to ensure that the
BMW Motorrad Race ABS is
always maintained in optimum
condition, it is essential for you to
comply strictly with the specified
inspection intervals.