Download BMW R 1200 RT Technical data

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Brake system with
BMW Motorrad Integral
ABS
Engineering details
Partially integral brakes
z
Your motorcycle is equipped with
partially integral brakes. Both
front and rear brakes are applied
when you pull the handbrake
lever. The footbrake lever acts
only on the rear brake.
While the brakes are slowing the
motorcycle, the BMW Motorrad
Integral ABS adapts braking-force
distribution between front and
rear brakes to suit the load on
the motorcycle.
Due to the integral function
a spinning of the rear wheel
with operated front wheel brake
(Burn Out) is not possible. Attempted burn-outs can result in
damage to the rear brake and the
clutch.
Do not attempt burn-outs.
How does ABS work?
The amount of braking force that
can be transferred to the road
depends on factors hat include
the coefficient of friction of the
road surface. Loose stones, ice
and snow or a wet road all have
much lower coefficients of friction
than a clean, dry asphalt surface.
The lower the coefficient of friction, the longer the braking distance.
If the rider increases braking
pressure to the extent that braking force exceeds the maximum
transferrable limit, the wheels
start to lock and the motorcycle
loses its directional stability; a fall
is imminent. Before this situation
can occur, ABS intervenes and
adapts braking pressure to the
maximum transferrable braking
force, so the wheels continue
to turn and directional stability
is maintained irrespective of the
condition of the road surface.
What are the effects of
surface irregularities?
Humps and surface irregularities can cause the wheels to
lose contact temporarily with the
road surface; if this happens the
braking force that can be transmitted to the road can drop to
zero. If the brakes are applied
under these circumstances the
ABS has to reduce braking force
to ensure that directional stability is maintained when the
wheels regain contact with the
road surface. At this instant the
BMW Motorrad Integral ABS
must assume an extremely low
coefficient of friction, so that the
wheels will continue to rotate under all imaginable circumstances,
because this is the precondition
for ensuring directional stability.
As soon as is registers the actual circumstances, the system
reacts instantly and adjusts brak-