BMW Motorrad G 310 R, Rider'S Manual

Page: 72 / 166

66 TECHNOLOGY IN DETAIL
GENERAL INSTRUCTIONS
You'll find more information on
the subject of technology at:
bmw-motorrad.com/technik
ANTI-LOCK BRAKE SYSTEM
How does the ABS work?
The maximum braking force
that can be transferred to the
road surface is partially depen-
dent on the friction coefficient
of the road surface. Gravel, ice,
snow and wet roads offer a
considerably poorer friction co-
efficient than a dry, clean as-
phalt surface. The poorer the
friction coefficient of the road
surface is, the longer the brak-
ing distance will be.
If the maximum transferable
brake force is exceeded when
the driver increases the brake
pressure, the wheels begin to
lock and driving stability is lost.
A fall can occur. Before this
situation can occur, ABS inter-
venes and adapts brake pres-
sure to the maximum transfer-
able brake force, so the wheels
continue to turn and driving
stability is maintained irre-
spective of the condition of the
road surface.
What happens when rough
roads are encountered?
Bumpy or rough roads can
briefly lead to a loss of contact
between the tires and the road
surface, until the transferable
braking force is reduced to
zero. If braking is carried out in
this situation, ABS must reduce
the brake pressure to ensure
driving stability when restor-
ing contact to the road. At this
point in time, the ABS must
assume extremely low friction
coefficients (gravel, ice, snow)
so that the running wheels turn
in every imaginable case and
the driving stability is ensured.
After detecting the actual con-
ditions, the system adjusts the
optimum brake pressure.
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
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.