BMW R 1200 GS ADVENTURE Wartungshandbuch PDF herunterladen (Seite 94)

Brake system with

BMW Motorrad Integral

ABS

with BMW Motorrad Integral

ABS II

OE

Partially integral brakes

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 with ABS actively in-

tervening, the BMW Motorrad

Integral ABS adapts braking-force

distribution between front and

rear brakes to suit the load on

the motorcycle.

The integral braking func-

tion makes it very difficult

to spin the rear wheel by opening

the throttle with the front brake

applied to keep the motorcycle

stationary (burn-out). 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 fric-

tion than a clean, dry asphalt sur-

face. The lower the coefficient

of friction, the longer the braking

distance.

If the rider increases braking

pressure to the extent that brak-

ing force exceeds the maxim-

um 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 irregular-

ities can cause the wheels to

lose contact temporarily with the

road surface; if this happens the

braking force that can be trans-

mitted 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 sta-

bility 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 un-

der all imaginable circumstances,

6

90

z

Engineering details

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