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Braking and parking
If the running gear or brake system is modi-
fied, the eff ectiv
eness of the ABS could be se-
verely limited.
Hydraulic Brake Assist (HBA)
The brake assist system can reduce the re-
quired braking distance. The braking force is
automatically boosted if you press the brake
pedal quickly in an emergency. You must
keep pressing the brake pedal until the dan-
ger has passed.
Traction control system (ASR)
In the event of the wheels spinning, the ASR
reduces the engine torque to adapt to the
road condition. This helps the car to start
moving, accelerate or climb a gradient.
Electronic differential lock (EDL)
When the EDL detects wheelspin, it brakes
the spinning wheel and directs the power to
the other driven wheel. This function is active
up to approximately 100 km/h (62 mph).
To prevent the disc brake of the braked wheel
from overheating, the EDL cuts out automati-
cally if subjected to excessive loads. The ve-
hicle can still be driven. The EDL will switch on
again automatically when the brake has
cooled down. Tractor-trailer sway mitigation*
If the vehicl
e is pulling a trailer, it will control
the following: tractor-trailers tend to sway.
When the swaying of the trailer is felt by the
vehicle and detected by the ESC, it will auto-
matically brake the towing vehicle within the
limits of the system and mitigate the sway.
Tractor-trailer sway mitigation is not available
in all countries ››› page 312
.
Electronic engine torque management
(XDS)
When taking a curve, the driveshaft differen-
tial allows the outer wheel to turn at a higher
speed than the inner wheel. In this way, the
wheel that is turning faster (outer wheel) re-
ceives less drive torque than the inner wheel.
This may mean that in certain situations the
torque delivered to the inner wheel is too
high, causing the wheels to spin. On the other
hand, the outer wheel is receiving a lower
drive torque than it could transmit. This can
cause a loss of grip on the drive axle, in this
case the front axle, which results in under-
steer or “lengthening” of the trajectory.
The XDS can detect and correct this effect
via the sensors and signals of the ESC.
Via the ESC, the XDS will brake the inside
wheel and counter the excess driving torque of that wheel. This means that the requested
traject
ory is much more precise.
XDS works in combination with the ESC and is
always active, even when ASR is switched off,
or when the ESC is in Sport mode or discon-
nected.
Multi-collision brake
The multi-collision brake consists of automat-
ic braking activated by the Airbag control
unit. It is activated when, in the event of an
accident, the Airbag control unit detects de-
celerations above the activation level, and
braking is managed by the ESC system.
In the event of an accident, the multi-collision
brake can help the driver by braking to avoid
the risk of skidding during the accident and
causing other collisions.
The following actions control automatic brak-
ing during the accident:
Page 282 of 405
Driving
Brake blending 1)
The br ak
e energy recuperation can generate
a braking effect. This braking effect depends
on the selected driving programme and the
level of charge of the high-voltage battery.
If the braking effect caused by the recupera-
tion is very intense, the vehicle’s brake lights
with turn on. The electric engine, when oper-
ating as an alternator, can generate braking
torque on the front wheels based on the RPM
and the temperature and charge level of the
high-voltage battery.
These variable parameters cause fluctuating
electric decelerations which are hydraulical-
ly compensated according to the driver’s de-
sires. This function is called “brake blending”
and it combines mechanical braking with the
engine brake effect. WARNING
Driving at high speed on icy, slippery wet
gr ound can r
esult in loss of vehicle control
and serious injury to the driver and passen-
gers.
Page 283 of 405
Braking and parking
Disconnecting and connecting the ESC in
“Spor t” mode
Page 284 of 405
Driving
Always note the following points when park-
ing the v ehicl
e:
Page 285 of 405
Help with parking and manoeuvring
in the actual system and in the use of ultra-
sonic sensors. The use of P
ark Assist shoul
d
never tempt you to take any risk that may
compromise safety. The system is not a re-
placement for driver awareness.
Page 286 of 405
Driving
Description of the parking assist
syst em Fig. 201
In the upper part of the centre con-
sol e: butt
on to switch on the Park Assist system. The components of the Park Assist system
ar
e the ultr
asonic sensors located in the front
and rear bumpers, the
Page 287 of 405

Help with parking and manoeuvring
way, the system will require fewer manoeu-
vr es t
o complete the parking action.
Trailer mode
The Park Assist system cannot be switched
on if the factory-fitted towing bracket
››› page 306 is electrically connected to a
trailer.
After changing a wheel
If, after changing a wheel, the vehicle stops
entering and exiting parking spaces correct-
ly, the circumference of the new wheel may
be different and the system may need to
adapt to it. The adaptation is automatic and
takes place during driving. Making turns slow-
ly and in both directions (20 km/h [12 mph])
for a few minutes may contribute to this
adaptation process ››› in Introduction on
page 282. Selecting a parking mode Fig. 202
On the instrument panel display:
vie w of the parking assist syst
em with reduced
view. Fig. 203
On the instrument panel display: in-
dication of parking modes. Parking assist has the following 3 parking
modes:Reverse parallel parking.
R
e
verse angle parking.
Forward angle parking.
Selecting a parking mode after passing in
front of the space
After activating the Park Assist system and af-
ter detecting a parking space, the display on
the instrument panel proposes a parking
mode. The Park Assist system selects the
parking mode automatically. The selected
mode is shown on the instrument panel dis-
play ››› Fig. 202
. The reduced display of oth-
er possible parking modes is also shown
››› Fig. 203. If the mode selected by the sys-
tem does not correspond to the desired
mode, you can select another mode by
pressing the
Page 288 of 405
Driving
the turn signal is not on, it parks on the right in
the dir ection of tr
affic.