Electronic brake pressure distribution
system (EBD)
The EBD regulates the braking force be-
tween the front axle and the rear axle even
outside the ABS control. Overbraking of the
rear axle is avoided and the vehicle remains
stable during braking.
Electromechanical brake servo
The EBS supports the driver’s foot move-
ment when the ignition is switched on, and
boosts the pressure applied to the brake
pedal by the driver → . In the event of
a braking intervention b
y a driver assistance
system, e.g. when Adaptive Cruise Control
is regulating or during emergency braking,
the brake pedal can move automatically.
The brake pressure boost will reduce grad-
ually aer you switch o the ignition. Mes-
sages are displayed on the instrument clus-
ter display if the vehicle is still held by
means of the brake pedal. The brake servo
function is restricted in this case.
Secure the stationary vehicle against rolling
away → page 194.
WARNING
Driving without the brake servo or with re-
stric
ted brake servo function can consid-
erably increase the braking distance. This
can lead to accidents with serious or fatal
injuries.
·
Never switch the engine or ignition o
while the vehicle is in motion.
·
Press the brake pedal with more force if
the brake servo is not working or if the
vehicle is being towed.
·
Keep the footwell under the pedals
clear so that the brake pedal can move
freely.
WARNING
The eec
tiveness of systems can be ad-
versely aected if components and sys-
tems are retrofitted, e.g. by body builders.
On vehicles with add-ons or modifica-
tions, the correct operation of system can
then be impaired or adjusted. This can
lead to accidents with serious or fatal in-
juries.
·
Ha
ve the second stage manufacturer
confirm that the systems are function-
ing properly.
Switching Traction Control on and
o
Driving situa
tions
Traction Control (TCS) can be switched o
in situations where insucient traction is
achieved:
— When driving in deep snow or on loose
surfaces.
— When rocking the vehicle backwards and
forwards to free it from mud.
When the driving situation no longer exists,
Traction Control should be switched back
on fully.
Switching Traction Control on and o
1. Open the vehicle settings in the Info-
tainment system → page 34.
2. Open the brake settings.
3. Switch Traction Control on or o in the
selection.
Traction Control switched o man-
ually. The indicator lamp lights up
yellow.
Troubleshooting
Electromechanical brake servo fail-
ur
e
Do not drive on!
The indicator lamp lights up red.
A text message may also be displayed.
Press the brake pedal firmly as the braking
distance will increase due to the lack of
brake servo.
1. Seek expert assistance immediately.
Electromechanical brake servo
f
ault
Indicator lamp lights up yellow.
A text messa
ge is displayed for a few sec-
onds.
Brake support systems 217
2KF012720AE
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