BMW F 800 GS - Wartungshandbuch PDF herunterladen (Seite 72)

Brake system with

BMW Motorrad ABS

How does ABS work?

The maximum braking force that

can be transferred to the road

surface is partially dependent on

the friction coefficient of the road

surface. Gravel, ice, snow and

wet roads offer a considerably

poorer friction coefficient than a

dry, clean asphalt surface. The

poorer the friction coefficient of

the road surface is, the longer

the braking distance will be.

If the maximum transferable brak-

ing force is exceeded when the

driver increases the brake pres-

sure, the wheels begin to lock

and driving stability is lost, and a

fall can result. Before this situa-

tion occurs, ABS intervenes and

adjusts the brake pressure to the

maximum transferable braking

force. This enables the wheels

to continue to turn and maintains

driving stability regardless of the

road surface condition.

What happens when

rough roads are

encountered?

Bumpy or rough roads can briefly

lead to a loss of contact between

the tires and the road surface,

until the transferable braking

force is reduced to zero. If brak-

ing is carried out in this situa-

tion, ABS must reduce the brake

pressure to ensure driving sta-

bility when restoring contact to

the road. At this point in time,

the BMW MotorradABS must

assume extremely low friction co-

efficients (gravel, ice, snow) so

that the running wheels turn in

every imaginable case and the

driving stability is ensured. After

detecting the actual conditions,

the system adjusts the optimum

brake pressure.

Lifting off rear wheel

However, during extremely heavy

and rapid decelerations it is pos-

sible that the BMW Motorrad

ABS cannot prevent the rear

wheel from lifting off the ground.

In these cases, the motorcycle

can also flip end over end.

Heavy braking can lead to

the rear wheel lifting off the

ground.

When braking, bear in mind that

the ABS control cannot be relied

on in all circumstances to prevent

the rear wheel from lifting off the

ground.

What are the design

characteristics of the

BMW Motorrad ABS?

The BMW Motorrad ABS en-

sures driving stability on any sur-

face within the limits of driving

physics. The system is not op-

timized for special requirements

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Technology in detail

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