Function of driving systems and driving safety sys-
tems
In this section, you will find information about the
following driving systems and driving safety sys-
tems:
R
ABS (Anti-lock Braking System) (
/
page 144)
R
ASR (acceleration skid control) (
/
page 144)
R
BAS (Brake Assist System) (
/
page 144)
R
ESP
®
(Electronic Stability Program)
(
/
page 145)
R
EBD (Electronic Brakeforce Distribution)
(
/
page 146)
R
Active Brake Assist (
/
page 146)
R
Cruise control (
/
page 149)
R
Active Distance Assist DISTRONIC
(
/
page 152)
R
Hill start assist (
/
page 154)
R
HOLD function (
/
page 154)
R
Parking Assist PARKTRONIC (
/
page 155)
R
Rear view camera (
/
page 157)
R
Surround view camera (
/
page 159)
R
ATTENTION ASSIST (
/
page 161)
R
Blind Spot Assist (
/
page 163)
R
Active Lane Keeping Assist (
/
page 166)
Functions of ABS (Anti-lock Braking System)
Observe the important safety guidelines for the
driving safety system.
ABS controls the brake pressure in critical situa-
tions:
R
During braking, for instance, at maximum full-
stop braking or if there is insufficient tire trac-
tion, the wheels are prevented from locking.
R
The steerability of the vehicle in terms of physi-
cal possibilities is ensured when braking.
R
ABS is active from speeds of approx. 3 mph
(5 km/h). On a slippery road surface, ABS
intervenes even if you only brake gently.
System limits
ABS may be impaired or may not function if a mal-
function has occurred and the yellow
!
ABS
warning lamp lights up continuously in the instru-
ment cluster after the vehicle is started.
If ABS intervenes, you will feel pulsations in the
brake pedal. The pulsating brake pedal may be an
indication of hazardous road conditions and func-
tions as a reminder to take extra care while driving.
If ABS intervenes: keep the brake pedal firmly
depressed until the braking situation has passed.
To carry out maximum full-stop braking: depress
the brake pedal with full force.
Function of BAS (Brake Assist System)
&
WARNING Risk of an accident caused by a
malfunction in BAS (Brake Assist System)
If BAS is malfunctioning, the braking distance
in an emergency braking situation is increased.
#
Depress the brake pedal with full force in
emergency braking situations. ABS pre-
vents the wheels from locking.
BAS supports you with additional braking force in
an emergency braking situation.
If you depress the brake pedal quickly, BAS is acti-
vated:
R
BAS automatically boosts the braking force of
the brakes
R
BAS can shorten the braking distance
R
ABS prevents the wheels from locking
When you release the brake pedal, the brakes
function as usual again. BAS is deactivated.
Functions of ASR (Acceleration Skid Control)
ASR can neither reduce the risk of an accident nor
override the laws of physics if the driver does not
pay attention when pulling away or accelerating.
ASR is only an aid. Always adapt your driving style
to suit the prevailing road and weather conditions.
If you activate or deactivate the all-wheel drive in a
vehicle with this option, ASR will be deactivated for
the duration of the activation/deactivation proc-
ess.
Vehicles without steering wheel buttons: if ASR is
malfunctioning, the
÷
indicator lamp lights up
while the vehicle is running and the engine output
may be reduced (
/
page 25).
ASR improves traction, i.e. the transfer of power
from the tires to the road surface, for a sustained
period and therefore also improves the driving sta-
bility of the vehicle. If the drive wheels start to
spin, ASR brakes individual drive wheels and limits
the engine torque. ASR thus significantly assists
144 Driving and parking
