BMW R 1200 ST - Wartungshandbuch PDF herunterladen (Seite 159)

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BMW Motorrad Integral ABS

Information on BMW Motorrad Integral ABS

How does ABS work?

The maximum braking force

which can be transferred to

the road surface is partially

dependent on the coefficient

of friction of the road surface.

Gravel, ice, snow and wet road

surfaces offer a considerably

poorer coefficient of friction

than a dry, clean layer of

asphalt. The lower the coeffi-

cient of friction of the road

surface is, the longer the

braking distance will be.

If the maximum transferrable

braking force is exceeded

when the driver increases the

brake pressure applied, the

wheels begin to lock and

the driving stability is lost,

resulting in a danger of falling.

Before this situation occurs,

the ABS intervenes and

adjusts the brake pressure

to the maximum transferrable

braking force. As a result,

the wheels continue to turn

and the driving stability is

maintained regardless of the

road surface condition.

What happens on uneven

road surfaces?

Wavy ground or uneven road

surfaces can briefly result in a

loss of contact between the

tire and the road surface, and

the transferrable braking force

decreases to zero. If the

brakes are applied in this

situation, the ABS must

reduce the brake pressure to

ensure driving stability when

contact with the road surface

is restored. At this point in time

the BMW Motorrad Integral

ABS must assume extremely

low coefficients of friction

(gravel, ice or snow) so that

the wheels turn in every

imaginable case and the

driving stability is ensured.

After the actual conditions are

detected, the system adjusts

the brake pressure to the

optimum value.

What must be observed

during driving safety

training?

Compared to normal braking,

braking during which the ABS

must intervene in a regulating

manner requires a consider-

Info_I_ABS_us_yyyyyyy.fm Seite 1 Dienstag, 19. Juli 2005 3:01 15

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