BMW Motorrad R 1250RT, Rider'S Manual

Page: 185 / 379

179
the road can drop to zero. If
the brakes are applied under
these circumstances the ABS
has to reduce braking force
to ensure that directional
stability is maintained when
the wheels regain contact
with the road surface. At this
instant the BMW Motorrad
fully integral ABS Pro must
assume an extremely low
coefficient of friction, so that
the wheels will continue to
rotate under all imaginable
circumstances, because this is
the precondition for ensuring
directional stability. As soon
as is registers the actual
circumstances, the system
reacts instantly and adjusts
braking force accordingly to
achieve optimum braking.
What feedback does the rider
receive from the Integral
ABS?
If the ABS has to reduce brak-
ing force on account of the cir-
cumstances described above,
vibration 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
Under very severe and abrupt
deceleration, however, under
certain circumstances it is pos-
sible that the BMW Motorrad
fully integral ABS Pro will be
unable to prevent the rear
wheel from lifting clear of the
ground. If this happens the
outcome can be a highsiding
situation in which the motor-
cycle can flip over.
WARNING
Rear wheel lift due to severe
braking
Risk of falling
When you brake sharply,
bear in mind that ABS con-
trol cannot always be re-
lied on to prevent the rear
wheel from lifting clear of
the ground.