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Driving
173
Brake assist systems
1)
Valid for hybrid vehicles
●
The driver is not pressing the accelerator
pedal.
T
ractor-trailer sway mitigation
If the vehicle 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 automatically
brake the towing vehicle within the limits of the
system and mitigate the sway. Tractor-trailer
sway mitigation is not available in all countries
›››page297.
Electromechanical brake servo (eBKV)
With the ignition switched on, the electrome-
chanical brake servo (eBKV) supplements the
force exerted by the foot by increasing the
pressure that the driver exerts on the brake
pedal ›››
. When a driver assistance system
appl
es the brakes, e.g. ACC when regulating
the speed, or during emergency braking, the
brake pedal may move automatically.
After disconnecting the ignition, the assistance
of the brake servo is progressively reduced. If
you continue to hold the vehicle in place with
the brake pedal, messages are displayed on
the instrument cluster screen. In this case, the
brake servo function is restricted.
Once stopped, immobilise the vehicle to pre-
vent it from moving ›››page207.
Brake blending
1)
The r
egulated application of the brakes blends
the braking eect of the electric motor in en-
ergy recuperation and the mechanical braking
by the driver.
WARNING
Smart brake assist technology cannot over-
come the limits imposed by the l
aws of phys-
ics and only works within the limits of the sys-
tems. Driving at high speed on icy, slippery
or wed road surfaces can cause a loss of
control of the vehicle and serious injury to
the driver and passengers.
●
Adapt your speed and driving style at all
times to suit visibility, weather, road and
trac conditions. Never take any risk that
compromises safety.
●
Brake assist systems cannot prevent an ac-
cident if you are driving too close to other
vehicles.
●
Always use suitable tyres. Driving stability
depends on tyre grip.
WARNING
The eciency of the ESC can be significantly
r
educed if components or systems that af-
fect the driving dynamics are not properly
maintained or are not working properly. This
can particularly occur if changes are made
to the suspension or unauthorised rim/tyre
combinations are used.
●
Ensure that vehicle conversions and modi-
fications are only made by specialised work-
shops.
●
Always use suitable tyres. Driving stability
depends on tyre grip.
WARNING
When driving without a brake servo or with
r
estricted brake servo functions, the braking
distance can increase considerably and can
cause accidents and serious injuries.
●
If the brake servo is not working, the brake
pedal has to be pressed harder, as the brak-
ing distance increases due to the lack of as-
sistance from the servo brake.
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