General Notes; Antilock Brake System; (Abs); Antilock Brake System (Abs) - BMW C evolution Rider's Manual

General notes

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More information on the topic of
technology is available at:
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ogy

Antilock Brake System

(ABS)

How does ABS work?
The maximum braking force that
can be transferred to the road
surface is partially dependent on
the friction coefficient of the road
surface. Gravel, ice, snow and
wet roads offer a considerably
poorer friction coefficient than a
z
dry, clean asphalt surface. The
poorer the friction coefficient of
the road surface is, the longer
the braking distance will be.
If the maximum transferable brak-
ing force is exceeded when the
rider increases the brake pres-
sure, the wheels begin to lock
and driving stability is lost, and a
fall can result. Before this situa-
tion occurs, ABS intervenes and
adjusts the brake pressure to the
maximum transferable braking
force. This enables the wheels
to continue to turn and maintains
riding stability regardless of the
road condition.
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 the
brakes are applied in this situa-
tion, the ABS must reduce the
brake pressure to ensure driv-
ing stability when contact to the
road is restored. At this point,
the BMW Motorrad ABS must
assume extremely low friction co-
efficients (gravel, ice, snow) so
that the running wheels turn in
every imaginable case and the
driving stability is ensured. After
detecting the actual conditions,
the system adjusts the optimum
brake pressure.
What are the design
features of the
BMW Motorrad?
The BMW Motorrad ABS en-
sures stability on all surfaces.
The system is not optimized for
the special conditions encoun-
tered under extreme weather
during off-road and race-track
use.
Special situations
To detect the tendency of the
wheels to lock up, the speeds
of the front and rear wheel are
compared. If implausible values
are detected over a longer period
of time, the ABS function is de-
activated for safety reasons and
an ABS error is indicated. A self-