BMW C 650 GT Rider's Manual page 93

WARNING
Rear wheel lift due to severe
braking
Risk of falling
When you brake sharply, bear
in mind that ABS control can-
not always be relied on to pre-
vent the rear wheel from lifting
clear of the ground.
What is the design
baseline for
BMW Motorrad ABS?
Within the limits imposed by
physics, BMW Motorrad ABS en-
sures directional stability on any
surface. The system is not op-
timised for special requirements
that apply under extreme com-
petitive situations off-road or on
the track.
https://www.motorcycle-manual.com/
Special situations
The speeds of the front and rear
wheels are compared as one
means of detecting a wheel's
incipient tendency to lock. If
the system registers implaus-
ible values for a lengthy period
the ABS function is deactivated
for safety reasons and an ABS
fault message is issued. Self-dia-
gnosis has to complete before
fault messages can be issued.
In addition to problems with the
BMW Motorrad ABS, exceptional
riding conditions can lead to a
fault message being issued.
Exceptional riding
conditions:
With ASC switched off: Riding
for a lengthy period with the
front wheel lifted off the ground
(wheelie).
Rear wheel rotating with the
vehicle held stationary by ap-
plying the front brake (burn-
out).
Rear wheel skidding on
a slippery surface for a
lengthy period, for example
deceleration using the engine's
braking effect.
If a fault message is issued on
account of exceptional riding
conditions, you can reactivate
the ABS function by switching
the ignition off and on again.
What significance
devolves on regular
maintenance?
WARNING
Brake system not regularly
serviced
Risk of accident
In order to ensure that the
BMW Motorrad ABS is always
maintained in optimum condi-
tion, it is essential for you to
comply strictly with the spe-
cified inspection intervals.
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