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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
apples 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
page 205.
Brake blending
1)
The regulated application of the brakes blends
the braking effect of the electric motor in en-
ergy recuperation and the mechanical braking
by the driver.
1)
Valid for hybrid vehicles
Brake assist systems
Driving
WARNING
Smart brake assist technology cannot over-
come the limits imposed by the laws 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 traf-
fic conditions. Never take any risk that com-
promises 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 efficiency of the ESC can be significantly
reduced 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
restricted 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.
Connecting and disconnecting the
ESC and TCS
Fig. 118
On the lower part of the centre
console: ESC on/off button
The ESC is switched on automatically when the
engine is started, and only works when the en-
gine is running and includes the ABS, EDS and
TCS systems.
171
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