Technology for safety and driving convenience, Driving stability control systems – BMW Z4 Roadster 2.5i 2005 User Manual

Page 52

Technology for safety and driving convenience

Technology for safety and driving

convenience

Driving stability control

systems

Your BMW is equipped with a series of systems
that help maintain driving stability even in
adverse driving situations.

Antilock Brake System ABS

ABS keeps the wheels from locking during
braking. Steering stability is maintained even
during full brake applications. In this way, active
safety is enhanced.
ABS is operational each time the engine is
started. Braking safely, refer to page

Electronic brake-force distribution

The system controls brake-force application at
the rear wheels in order to obtain increased sta-
bility in the vehicle's braking response.

Dynamic Brake Control DBC

When the brake pedal is depressed quickly, this
system automatically supplies maximum brake-
servo boost, thereby helping to keep the vehi-
cle's braking distance as short as possible dur-
ing full brake applications. At the same time, the
benefits of the ABS are also exploited.
As long as you are braking, do not reduce pres-
sure on the brake pedal. When the brake pedal
is released, the DBC is switched off.

Dynamic Stability Control DSC

DSC prevents slip at the drive wheels while
starting off and accelerating the vehicle. DSC
also recognizes unstable vehicle conditions,
such as fishtailing or nose-diving. In these
cases, and subject to physical limits, DSC helps
to keep the vehicle on a steady course by
reducing engine speed and by applying brakes
at individual wheels.

The laws of physics cannot be repealed
even with DSC. It will always be the

driver's responsibility to drive in a manner that
matches road conditions. Therefore, do not
limit the additional safety margin by practicing
risky driving.

Dynamic Traction Control DTC

DTC is a variant of the DSC in which forward
momentum is optimized for special road condi-
tions, e.g. snow-covered roads that have not
yet been cleared. The system ensures maxi-
mum forward momentum, but driving stability is
limited. Therefore, drive carefully in accordance
with conditions.
In the following exceptional circumstances, it
may be effective to activate the DTC for a short
period:

When driving on snow-covered grades, in
slush or on uncleared, snow-covered roads

When rocking the vehicle or starting off in
deep snow or on loose surfaces

When driving with snow chains.

Activating DTC

Press the button briefly; the DTC indicator lamp
lights up in the instrument cluster.

Reactivating DTC

Press the button again; the DTC indicator lamp
goes out in the instrument cluster.