BMW S 1000 RR - Wartungshandbuch PDF herunterladen (Seite 101)

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,

because this is the precondition

for ensuring directional stability.

As soon as is registers the ac-

tual circumstances, the system

reacts instantly and adjusts brak-

ing force accordingly to achieve

optimum braking.

What feedback does the

rider receive from the

BMW Motorrad Race

ABS?

If the ABS system has to reduce

braking force on account of the

circumstances described above,

vibration is perceptible through

the handbrake lever.

When the handbrake lever is

pulled, brake pressure is also

built up at the rear wheel by

the integral function. If the

brake pedal is depressed after

the handbrake lever is pulled,

the brake pressure built up

beforehand is perceptible as

counter-pressure sooner than is

the case when the brake pedal is

depressed either before or at the

same time as the brake lever is

pulled.

Rear wheel lift

Even under severe braking, a

high level of tyre grip can mean

that the front wheel does not

lock up until very late, if at all.

Consequently, ABS does not in-

tervene until very late, if at all.

Under these circumstances the

rear wheel can lift off the ground,

and the outcome can be a high-

siding situation in which the mo-

torcycle can flip over.

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Engineering details

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