General Notes; Antilock Brake System; (Abs) - BMW C 400 X Rider's Manual

General notes

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More information on the topic of
technology is available at:
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bmw-motorrad.com/technol-
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
brake force is exceeded when
the rider increases the brake
pressure, the wheels begin to
lock and driving stability is lost.
A fall can result. Before this
situation occurs, ABS intervenes
and adjusts the brake pressure to
the maximum transferable brake
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 brak-
ing is carried out in this situation,
ABS reduces the brake pressure
to ensure driving stability when
restoring contact to the road. At
this point, the BMW Motorrad
ABS assumes extremely low
friction coefficients (gravel, ice,
snow) so that the running wheels
turn in every imaginable case and
https://www.motorcycle-manual.com/
the driving stability is ensured.
After detecting the actual con-
ditions, the system adjusts the
optimum brake pressure.
Lifting off rear wheel
On high-friction road surfaces,
the front wheel will not block or
will block very late, even if the
brakes are applied forcefully. As
a result, the ABS control inter-
venes very late or not at all. In
this case, the rear wheel may rise
up and cause the Scooter to roll
over.
WARNING
Lifting off of the rear wheel
due to heavy braking
Accident hazard
When braking heavily, bear in
mind that the ABS control can-
not always be relied on to pre-
vent the rear wheel from lifting
off the ground.