BMW R 1200 ST User Manual page 77

Rear wheel lift
Even under 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
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.
Severe braking can
cause the rear wheel to
lift off the ground.
Bear in mind that ABS cannot
be relied on in all circumstances
to prevent the rear wheel from
lifting clear of the ground.c
Residual braking function
When the ignition is off, while
self-diagnosis is in progress,
and if a fault develops in the
BMW Integral ABS, the
hydraulic brake boost pro-
vided by the BMW Integral
ABS is not available in the
brake circuits in question, and
only a residual braking func-
tion is available. Under these
circumstances, therefore, you
must apply higher pressure to
the brake levers in question in
order to apply the brakes, and
lever travel is longer. When the
residual braking function is
active, the ABS function is
unavailable in the brake sys-
tem in question. Under these
circumstances, moreover, the
integral braking function is
partially or entirely unavailable.
Without the assistance of
the ABS function, the
wheels could lock when the
brakes are applied, and with-
out the brake booster you
have to apply considerably
more force in order to slow the
motorcycle.
Think well ahead and brake
carefully; avoid severe brak-
ing. Have the fault rectified as
soon as possible by a special-
ist workshop, preferably an
authorized BMW motorcycle
retailer.c
The brake-lever travel
needed to build up brak-
ing pressure can be consider-
ably longer when the system is
in residual braking function
mode, so it is advisable to set
the brake lever to a wider span
( 39).c
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