Fu
nction of Active Brake Assi st Ac
tive Brake Assi stconsi sts of:
R Distance warning function
R Autonomous braking function
R Situation-dependent braking assi stance
R Vehicles with the Driving Assistance
pa ckage: Evasi veSteering Assist
Ac tive Brake Assi stcan help youto minimise the
ri sk of a collision with vehicles or pedestrians or
to reduce the ef fects of su cha collision.
If Ac tive Brake Assi sthas de tected a risk of colli‐
sion, you will be warned visually and acousti‐
cally.
If yo u do not react tothe visual or acoustic warn‐
ing, autonomous braking can be initiated in criti‐
cal situations.
In especially critical situations, Active Brake
Assi stcan initia teautonomous braking direct ly.
In this case, the visual and acoustic warning
occurs simultaneously with the braking applica‐
tion. If
yo u apply the brake yourself in a critical situa‐
tion or apply the brake during autonomous brak‐
ing, situation-dependent braking assis tance
occu rs. This increases the brake pressure up to
maximum full-s top braking if necessar y.
If th e autonomous braking function or the situa‐
tion-dependent braking assis tance is trig gered,
additional pr eventive measures for occupant
pr otection (PRE-SAFE ®
) may also be initiated, if
th eve hicle is equipped with these. &
WARNING Risk of an accident caused by
limited de tection per form ance of Active
Brake Assi st
Ac tive Brake Assi stcannot al ways clearly
identify objects and compl extraf fic situa‐
tions.
In su chcases, Active Brake Assi stmight:
R give an unnecessa rywa rning or brake the
ve hicle
R not give a warning or not brake theve hi‐
cle. #
Alw ays pay careful attention tothe traf‐
fi c situation; do not rely on Active Brake
Assi stalone. #
Beready tobrake and take evasive
action if necessar y. Also obser
vethe sy stem limits of Active Brake
Assi st.
The individual subfunctions are available in
th efo llowing speed ranges:
Distance warning function
The dis tance warning function issues a warning
at speeds:
R From appr oximately 30 km/h, if over se veral
seconds the dis tance maintained totheve hi‐
cle tr avelling in front is insuf ficient forthe
driven speed. The dis tancewarning lamp
th en lights up in the instrument clus ter·.
R From appr oximately 7 km/h, if your vehicle
is critically close toave hicle or pedestrian.
An intermittent warning tone sounds and the
dis tance warning lamp lights up in the instru‐
ment clus ter·. Driving and parking
18 5
Yo
u can limit the speed as follo ws:
R Variable: for speed limits, e.g. in built-up
areas.
R Perm anen t:for long-term speed restrictions,
e.g. when driving wi thwinter tyres fitted.
If yo ufa ilto adapt your driving style, the limiter
can neither reduce therisk of an accident nor
ove rride the la wsof ph ysics. It cannot take into
account road, weather or traf fic conditions. The
limiter is only an aid. You are responsible forthe
dis tance totheve hicle in front, forve hicle
speed, for braking in good time and forst ay ing
in lane.
Yo u can operate theva riable limiter with the
cruise control le ver.Yo u can store any road
speed abo ve20 km/h. You can also per form
settings while theve hicle is stationary if the
ve hicle has been star ted.
Kickdown
If yo u depress the accelerator pedal be yond the
pressure point (kickdown), the limiter is
switched topassive mode. The Limiter passive
message appears in the multifunction displa y.Af
ter completion of kickdown, theva riable lim‐
iter is activated again in thefo llowing situations:
R ifth e driven speed drops below thestored
speed.
R ifth estored speed is called up.
R ifyo ustore a new speed.
Operating cruise control or theva riable lim‐
iter &
WARNING Risk of accident due to
unknown stored speed
If yo u call up thestored speed and this is
lo we rth an your cur rent speed, theve hicle
decelerates.
If yo u do not kn owthestored speed, the
ve hicle could decelerate unexpectedly. #
Take into account the tra ffic situation
before calling up thestored speed. #
Ifth estored speed is not known, store
th e desired speed again. Change into a lo
werge ar in good time on long
and steep downhill gradients. Take particular no
te ofthis when driving a laden vehicle. By
doing so, you will make use of the braking ef fect
of the engine. This relie vesth e load on the brake
sy stem and pr events the brakes from overheat‐
ing and wearing tooqu ickl y.
Re quirements:
Cruise control
R Cruise control is selected.
R ESP ®
must be switched on, but not inter ven‐
ing.
R The driving speed mu stbe at least 20 km/h.
Va riable Limiter
R The vehicle has been star ted.
R The variable limiter is selec ted. Driving and parking
191
%
Onvehicles with a segment display in the
speedome ter,th e segments extending from
th e cur rent stored speed tothe end of the
scale light up. If you ha veactivated the per‐
manent limiter and a speed is stored, the
segments extending up tothestored speed
light up.
% Ifyo u per form a kickdown, theva riable lim‐
iter is swit ched topassive mode. The varia‐
ble limiter is operational again once the
speed drops below thestored speed.
% Ifyo u brake, deactivate ESP ®
or if ESP ®
inter venes, cruise control is deacti vated. The
va riable limiter is not deactivated.
When you swit choff theve hicle, the last
speed stored is cleared.
Pe rm anent limi ter
If yo u wish tolimit the speed permanently to a
specific value (e.g. for driving on winter tyres),
yo u can set this speed with the permanent lim‐
iter.
Yo u do this by limiting the speed toava lue
between 160 km/h and 240 km/h in the multi‐
media sy stem (→ page193). Shortly before
the set speed is reached, it
appears in the multifunction displa y.When you
confirm the message with %, display mes‐
sages no longer appear until you swit choff the
ve hicle. The speed will only be displa yed again
once theve hicle has been restar ted.
The permanent limiter does not switch topas‐
sive mode even du ring kickdown and the driven
speed remains below the set speed.
Setting the speed limit for winter tyres
Multimedia sy stem:
, Vehicle .
î Vehicle settings .
Win-
ter tyres limit #
Select the speed or deactivate the function. Distance Pilot DISTRONIC
Fu
nction of Distance Pilot DISTRONIC
Dis tance Pilot DISTRONIC:
R Maintains the set speed and accelerates or
decelerates theve hicle if the dis tance from
th eve hicle in front permits. R
Assists you in main taining the dis tance from
th eve hicle in front and can bring your vehi‐
cle toast andstill if necessar y.
R Brakes your vehicle with up to50 % of the
maximum possible braking po wer.If greater
decele ration pe rformance is requ ired, a vis‐
ual and acoustic warning is given and you
must then inter vene yourself.
R Vehicles with Driving Assistance Pack‐
age, Parking Pilot and COMAND Online:
When driving in stop-s tart traf fic, the driver is
suppor tedby an extended, au tomatic restart
in traf fic jams.
R Vehicles with Driving Assistance Pack‐
age: Responds in urban speed ranges tosta‐
tionary vehicles (e xcept bicycles, mo torcy‐
cles and pede strians) if conditions are suf fi‐
cient toenable de tection.
If yo ufa ilto adapt your driving style, Dis tance
Pilot DISTRONIC can nei ther reduce therisk of
an accident nor override the la wsof ph ysics.
Dis tance Pilot DISTRONIC cannot take into
account road, weather or traf fic conditions. Dis‐
ta nce Pilot DISTRONIC is only an aid. You are Driving and parking
19 3
Pulling
the cruise control le ver will set the dis‐
pla yed speed limit as the speed, pr ovided that:
R The Speed Limit Pilot has been activated in
the multimedia sy stem and
R Distance Pilot DISTRONIC has been acti va‐
te d.
If no speed limit is displa yed when the le ver is
operated, the speed set bythe driver is adop ted.
Drive prog ram
The DYNA MIC SELECT switch allo wsyouto
ch ange the driving style of Dis tance Pilot
DISTRONIC. Depending on which drive program
is selected, the driving characteristics can be
ge ared towa rds fuel econom y,comfort or
dynamic per form ance (→ page160).
Sy stem limits
Dis tance Pilot DISTRONIC is acti veinthe
0 km/h to200 km/h speed range.
Ve hicles with the Driving Assistance Pack‐
age: Distance Pilot DISTRONIC is acti veinthe
0 km/h to210 km/h speed range. The sy
stem may be impaired or may not function
in thefo llowing situations:
R In sno w,rain, fog, heavy spr ay, if there is
gl are, in direct sunlight or in great lyvarying
light conditions.
R Ifth e windscreen in the area of the camera is
dirty, mis ted up, damaged or co vered.
R Ifth era dar sensors are dirty or co vered.
Do not use Dis tance Pilot DISTRONIC in thefo l‐
lowing situations:
R Inroad and traf fic conditions whi chdo not
allow youto maintain a cons tant speed, e.g.
in heavy traf fic or on winding roads.
R On slippe ryroads. Braking or accelerating
can cause the drive wheels tolose traction
and theve hicle could then skid.
R When there is poor visibility, e.g. due tofog,
heavy rain or sno w.
R In multi-s torey car par ksor at tollst ations.
R Onroads with steep uphill or downhill gradi‐
ents. Ti
ps
Pa y particular attention in thefo llowing traf fic
situations. In such situations, brake if necessar y.
Dis tance Pilot DISTRONIC is then deactivated:
R When cornering, entering and exiting a bend.
R When not driving in the cent reofthe lane.
R When other vehicles are changing lane.
R Ifth ere are nar row vehicles.
R Ifth ere are obs tacles and stationary vehi‐
cles.
R Ifth ere are crossing vehicles, pedestrians,
mo torcyc lists or cyclists. Driving and parking
19 5
#
Take into account the tra ffic situation
before calling up thestored speed. #
Ifth estored speed is not known, store
th e desired speed again. &
WARNING Risk of accident due tounex‐
pec ted acceleration byDis tance Pilot
DISTRONIC
If Dis tance Pilot DISTRONIC no longer
de tects a vehicle in front, it may unexpect‐
edly accelerate tothe speed stored.
R This speed may be too high for a filter
lane or a slip road.
R If driving in theright lane, this speed may
be so high that you pass vehicles driving
on the left (in count ries where traf fic
drives on theright).
R If driving in the left lane, this speed may
be so high that you pass vehicles driving
on theright (in countri es where traffic
drives on the left). Alw
ays carefully obser vethe traf fic condi‐
tions and be ready tobrake at all times. &
WARNING Risk of accident due toDis‐
ta nce Pilot DISTRONIC pulling away auto‐
matically
If Dis tance Pilot DISTRONIC pe rforms an
automatic driving-off procedure, theve hicle
may accelerate unexpectedly.
Where necessar y,brake theve hicle yourself
and take evasive action. &
WARNING Risk of accident due toSpeed
Limit Pilot adapting theve hicle's speed
The speed adop tedby the Speed Limit Pilot
may be too high or incor rect in some individ‐
ual cases, su chas:
R inthewe t or in fog
R when towing a trailer
Ensure that the driven speed complies with
traf fic re gulations. Re
quirements:
R The vehicle has been star ted.
R The elect ric pa rking brake is released.
R Parking Pilot is not being used topark the
ve hicle or toexit from a parking space.
R ESP ®
is activated, but is not inter vening.
R The transmission is in position h.
R The driver's door, front passenger door and
there ar doors are closed.
R The engine bonnet is closed. 19 8
Driving and pa rking
#
Ifth e LIM indicator lamp is lit: toselect Dis‐
ta nce Pilot DISTRONIC 1.#
Remo veyour foot from the accelerator pedal. #
Tostore cur rent speed 3.
Yo ur vehicle adapts its speed tothat of the
ve hicle in front, but only up tothestored
speed.
or #
Tocall up stored speed 3. #
OrOn vehicles with Driving Assistance
Pa ckage and Traf fic Sign Assis t:If Speed
Limit Pilot in the multimedia sy stem and Dis‐
ta nce Pilot DISTRONIC are acti vated, the dis‐
pla yed speed limit is adop ted, if available 3. #
Todeactivate Dis tance Pilot DISTRONIC 2. #
Toinc rease 4orreduce 5the speed. #
Toreduce 6or increase 7the specified
dis tance from theve hicle in front.
Pulling away with Distance Pilot DISTRONIC
Re quirement
A speed has been pr eviously stored. #
Remo veyour foot from the brake pedal. #
Brief lypull the cruise control le verto wa rds
yo u3. Driving and parking
19 9
or
#
Accelerate brie fly.
Yo ur vehicle pulls away and adapts its speed
to that of theve hicle in front. If no vehicle is
de tected in front, your vehicle accelerates to
th e set speed.
Ad opting the speed limit as thesto red speed
Re quirements:
R Speed Limit Pilot is activated in the multime‐
dia sy stem (→ page 231).
R Distance Pilot DISTRONIC is acti vated.
R The sy stem de tects a traf fic sign indicating a
speed limit. #
Brie fly pull the cruise control le verto wa rds
yo u3.
The displ ayed speed limit is adop ted as the
st ored speed. Your vehicle adapts its speed
to that of theve hicle in front, but only up to
th estored speed. If Speed Limit Pilot is acti‐
va ted, any de tected changes in the speed
limit are adop tedby the sy stem. Collision
warning
If Dis tance Pilot DISTRONIC is unable tosuf fi‐
ciently decele rate theve hicle in order topreve nt
it from approa ching theve hicle in front, you will
be warned visually and acousticall y.An intermit‐
te nt wa rning tone will then sound and the dis‐
ta nce warning lamp will light up in the instru‐
ment clus ter. #
Brake immediately in order toinc rease the
dis tance from theve hicle in front.
or #
Take evasive action pr ovided it is safe todo
so. Fu
nction of DRIVE PIL OT The DRIVE PI
LOT function is available only
on vehicles with the Driving Assistance
pa ckage.
DRIVE PIL OTincludes thefo llowing driving and
driving saf ety sy stems:
R Steering Pilot with Active Lane Change Assi st
( → page 200)
R Distance Pilot DISTRONIC (→ page 193) R
Speed Limit Pilot (→ page 193) Ste
ering Pilot Fu
nction of Steering Pilot
Ste ering Pilot is only available forve hicles
with the Driving Assistance Package.
R Steering Pilot is operational at speeds up to
21 0 km/h and helps youto stay inthe cent re
of the lane bymeans of moderate steering
inter ventions.
R It uses as a refere nce theve hicle in front or
th e lane markings, depending on the driven
speed.
R Steering Pilot requ ires you as the driver, to
ke ep your hands on thesteering wheel at all
times so that you are able tointer vene at any
time tocor rect the course of theve hicle and
ke ep it in lane.
R Steering Pilot can be overridden at any time
by steering theve hicle yourself.
R Ifth e sy stem de tects that there are no lane
markings, it uses theve hicle ahead as a ref‐
erence up toa speed of 130 km/h. 200
Driving and parking
Ac
tivating Steering Pilot
Re quirements:
R ESP ®
must be switched on, but not inter ven‐
ing.
R Distance Pilot DISTRONIC mu stbe activated. #
If indicator lamp 1is off: press button 2. Information on Hill
Start Assist Hill
Start Assist holds theve hicle when pulling
aw ay on a hill under thefo llowing conditions:
R Vehicles with automatic transmission:
The transmission is in position hork.
R The electric parking brake is released. &
WARNING Risk of accident and inju ry
caused bytheve hicle rolling away
Af ter a short time, Hill Start Assist no lon ger
holds theve hicle and it can rollaw ay. #
Therefore, swiftly mo veyour foot from
th e brake pedal tothe accelerator
pedal. Ne ver attem pttolea vetheve hi‐
cle if it is being held byHill Start Assist. HOLD function
HOLD function
The HOLD function holds
theve hicle at a stand‐
st ill without requ iring youto depress the brake
pedal, such as when pulling away on steep
slopes. Sy
stem limits
The incline must not be greaterth an 30%.
Ac tivating/deactivating the HOLD function &
WARNING Risk of an accident due tothe
HOLD function being active when you
lea vetheve hicle
If yo u lea vetheve hicle while only the HOLD
function is braking theve hicle, theve hicle
can rollaw ay inthefo llowing situations:
R Ifth ere is a malfunction in the sy stem or
in the po wer supp ly.
R Ifth e HOLD function is deactivated by
depressing the accelera tor pedal or the
brake pedal, e.g. byave hicle occupant.
R Ifth e electrics in the engine compart‐
ment, the battery or the fuses are tam‐
pered with.
R Ifth e battery is disconnected. #
Alw ays deactivate the HOLD function
and secure theve hicle against rolling
aw ay before leaving theve hicle. Driving and parking
203