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Driving and operating187Brake preparation system
When approaching a vehicle ahead
so quickly that a collision is likely, the brake preparation system slightlypressurises the brakes. This reduces
the response time, when a manual or automatic braking is requested.
The brake system is prepared so that braking can occur more rapidly.
Emergency automatic braking
After the brake preparation and just
before the imminent collision, this
function automatically applies limited
braking to reduce the impact speed of
the collision.
Forward looking brake assist
In addition to brake preparation
system and emergency automatic
braking, the forward looking brake
assist function makes the brake assist more sensitive. In this way,
depressing the brake pedal slightly
results immediately in a strong
braking. This function helps the driver
brake quicker and stronger before the imminent collision.9 Warning
Active emergency braking is not
designed to apply strong
autonomous braking or to avoid automatically a collision. It is
designed to reduce the vehicle
speed before collision. It may not
react on stopped vehicles,
pedestrians or animals. After a
sudden lane change, the system
needs a certain time to detect the
next preceding vehicle.
The complete attention of the
driver is always required while
driving. The driver shall always be ready to take action and apply the brakes and steer to avoid
collisions. The system is designed
to work with all occupants wearing their seat belts.
System limitations
The active emergency braking has
limited or no function during rain,
snow or heavy dirt, as the radar
sensor can be covered by a water
film, dust, ice or snow. In case of
sensor blockage, clean the sensor
cover.
In some seldom cases the active
emergency braking system may
provide a short automatic braking in
situations that seem to be
unnecessary, for instance due to
traffic signs in a curve or due to
vehicles in another lane. This is
acceptable operation, the vehicle
does not need service. Firmly apply
the accelerator pedal to override the
automatic braking.
Settings
Settings can be changed in the
vehicle personalisation menu in the
Info-Display.
Select the relevant setting in
Settings in the Info-Display.
Vehicle personalisation 3 125.
Fault
In the event of a system service
requirement, a message is displayed
in the Driver Information Centre.
Page 216 of 293

214Vehicle careVehicle careGeneral Information...................215
Accessories and vehicle modifications .......................... 215
Vehicle storage ........................215
End-of-life vehicle recovery .....216
Vehicle checks ........................... 216
Performing work ......................216
Bonnet ..................................... 216
Engine oil ................................. 217
Engine coolant ......................... 218
Power steering fluid .................219
Washer fluid ............................ 220
Brakes ..................................... 220
Brake fluid ............................... 220
Vehicle battery ......................... 220
Diesel fuel system bleeding .....222
Wiper blade replacement ........222
Bulb replacement .......................223
Halogen headlights ..................223
LED headlights ........................ 225
Fog lights ................................. 225
Tail lights ................................. 226
Side turn signal lights ..............229
Number plate light ...................229Interior lights ............................ 230
Instrument panel illumination ...230
Electrical system ........................230
Fuses ....................................... 230
Engine compartment fuse box . 232
Instrument panel fuse box .......234
Load compartment fuse box ....235
Vehicle tools .............................. 237
Tools ........................................ 237
Wheels and tyres .......................237
Winter tyres ............................. 237
Tyre designations ....................237
Tyre pressure .......................... 238
Tyre pressure monitoring system .................................... 239
Tread depth ............................. 242
Changing tyre and wheel size . 243
Wheel covers ........................... 243
Tyre chains .............................. 243
Tyre repair kit .......................... 243
Wheel changing .......................246
Spare wheel ............................ 249
Jump starting ............................. 252
Towing ....................................... 253
Towing the vehicle ...................253
Towing another vehicle ...........254Appearance care .......................255
Exterior care ............................ 255
Interior care ............................. 257
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220Vehicle careWasher fluid
Fill with clean water mixed with a
suitable quantity of approved
windscreen washer fluid which
contains antifreeze.
Caution
Only washer fluid with a sufficient
antifreeze concentration provides
protection at low temperatures or
a sudden drop in temperature.
Brakes
In the event of minimum thickness of
the brake lining, a squealing noise
sounds during braking.
Continued driving is possible but
have the brake lining replaced as
soon as possible.
Once new brake linings are installed,
do not brake unnecessarily hard for
the first few journeys.
Brake fluid9 Warning
Brake fluid is poisonous and
corrosive. Avoid contact with eyes, skin, fabrics and painted surfaces.
The brake fluid level must be betweenthe MIN and MAX marks.
If fluid level is below MIN seek the
assistance of a workshop.
Brake and clutch fluid 3 260.
Vehicle battery
The vehicle battery is maintenance-
free, provided that the driving profile
allows sufficient charging of the
battery. Short-distance-driving and
frequent engine starts can discharge
the battery. Avoid the use of
unnecessary electrical consumers.
Page 288 of 293

286IndexAAccessories and vehicle modifications .......................... 215
Active Emergency Braking .........186
Active head restraints ...................37
Adaptive cruise control .......117, 176
AdBlue ........................ 115, 159, 260
Adjustable air vents ...................148
Airbag and belt tensioners .........111
Airbag deactivation ..............59, 112
Airbag label................................... 54
Airbag system .............................. 54
Air conditioning regular operation ................................ 149
Air conditioning system .............. 143
Air intake .................................... 149
Air vents...................................... 148
Antilock brake system ................ 166
Antilock brake system (ABS) .....113
Anti-theft alarm system ................26
Anti-theft locking system .............. 26
Appearance care ........................255
Armrest ......................................... 42
Armrest storage ........................... 69
Ashtrays ..................................... 103
Automatic anti-dazzle ..................30
Automatic light control ...............133
Automatic locking ........................24
Automatic transmission .............162Autostop..................................... 154
Auxiliary heater ........................... 148
B Battery discharge protection ......141
Battery voltage ........................... 124
Bicycle rack .................................. 70
BlueInjection ............................... 159
Bonnet ....................................... 216
Brake and clutch fluid .................260
Brake and clutch system ...........112
Brake assist ............................... 168
Brake fluid .................................. 220 Brakes ............................... 166, 220
Breakdown.................................. 253
Bulb replacement ....................... 223
C Capacities .................................. 273
Cargo management system ........88
Car Pass ...................................... 21
Catalytic converter .....................158
Central locking system ................22
Centre console lighting ..............140
Centre console storage ...............69
Changing tyre and wheel size ...243
Charging system ........................ 112
Child locks ................................... 25
Child restraint installation locations ................................... 63
Child restraints.............................. 60