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
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 locked for a lengthy
period, for example while des-
cending off-road.
If a fault message is issued on
account of exceptional riding
conditions, you can reactivate
the ABS function by switching
the operating readiness 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.
Reserves for safety
The potentially shorter braking
distances which BMW Motorrad
ABS permits must not be used
as an excuse for careless riding.
ABS is primarily a means of en-
suring a safety margin in genuine
emergencies.
Take care when cornering! When
you apply the brakes on a corner,
the vehicle's weight and mo-
mentum take over and even
BMW Motorrad ABS is unable
to counteract their effects.
Torque Control Assist
(TCA)
The TCA limits torque as a func-
tion of rear-wheel slip.
In order to help optimise the
rider's control of drive torque,
the electrical machine's electronic
controller monitors rear wheel
speed and reduces drive torque if
a plausibility limit is overshot.
8
91
z
Engineering details
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