inflation pressure MERCEDES-BENZ GLK SUV 2012 Owners Manual

i
Fully deflating the tyre may take a few
minutes.
X Screw the valve insert back into the valve.
X Screw the valve cap back on.
X Place the valve extractor back into the vehi-
cle tool kit.
X Stow the collapsible emergency spare
wheel in the emergency spare wheel well
under the luggage compartment and fasten
in place. Flat tyre
Preparing the vehicle
Your vehicle may be equipped with:
R a TIREFIT kit
R an emergency spare wheel
X Stop the vehicle as far away as possible
from traffic on solid, non-slippery and level
ground.
X Switch on the hazard warning lamps.
X Firmly depress the parking brake.
X Bring the front wheels into the straight-
ahead position.
X Vehicles with manual transmission:
engage first or reverse gear.
X Vehicles with automatic transmission:
move the DIRECT SELECT lever to P.
X Switch off the engine.
X Vehicles without KEYLESS-GO: remove
the key from the ignition lock.
X Vehicles with KEYLESS-GO: open the
driver's door.
The on-board electronics have status 0,
which is the same as the key having been
removed.
X Vehicles with KEYLESS-GO: remove the
Start/Stop button from the ignition lock
(Y page 147). X
All occupants must get out of the vehicle.
Make sure that they are not endangered as
they do so.
X Make sure that no one is near the danger
area while a wheel is being changed. Any-
one who is not directly assisting in the
wheel change should, for example, stand
behind the barrier.
X Get out of the vehicle. Pay attention to traf-
fic conditions when doing so.
X Close the driver's door.
X Place the warning triangle (Y page 326) a
suitable distance away. Observe legal
requirements. TIREFIT kit
Using the TIREFIT kit TIREFIT is a tyre sealant.
You can use TIREFIT to seal punctures of up
to 4 mm, particularly those in the tyre tread.
You can use TIREFIT at outside temperatures
down to Ò20 †. G
WARNING
In the following situations, the tyre sealant is
unable to provide sufficient breakdown assis-
tance, as it is unable to seal the tyre properly:
R there are cuts or punctures in the tyre
larger than those mentioned above.
R the wheel rim is damaged.
R you have driven at very low tyre pressures
or on a flat tyre.
There is a risk of accident.
Do not drive any further. Contact a qualified
specialist workshop.
X Do not remove any foreign objects which
have penetrated the tyre, e.g. screws or
nails.
X Remove the tyre sealant bottle, the accom-
panying "max. 80 km/h" sticker and the
tyre inflation compressor from the stowage Flat tyre
329Breakdown assistance Z

well underneath the luggage compartment
floor (Y page 327). X
Affix part :of the sticker within the driv-
er's field of vision.
X Affix part ;of the sticker near the valve
on the wheel with the defective tyre. G
WARNING
The tyre sealant is harmful and causes irrita-
tion. It must not come into contact with your
skin, eyes or clothing or be swallowed. Do not
inhale TIREFIT fumes. Keep tyre sealant away
from children. There is a risk of injury.
If you come into contact with the tyre sealant,
observe the following:
R Rinse off the tyre sealant from your skin
immediately with water.
R If the tyre sealant comes into contact with
your eyes, immediately rinse them thor-
oughly with clean water.
R If tyre sealant is swallowed, immediately
rinse your mouth out thoroughly and drink
plenty of water. Do not induce vomiting,
and seek medical attention immediately.
R Immediately change out of clothing which
has come into contact with tyre sealant.
R If an allergic reaction occurs, seek medical
attention immediately.
i If tyre sealant leaks out, allow it to dry. It
can then be removed like a layer of film.
If you get tyre sealant on your clothing,
have it cleaned as soon as possible with
perchloroethylene. X
Pull plug ?with the cable and hose Aout
of the housing.
X Screw hose Aonto flange Bof tyre seal-
ant bottle :.
X Place tyre sealant bottle :head down-
wards into recess ;of the tyre inflation
compressor. X
Remove the cap from valve Con the faulty
tyre.
X Screw filler hose Donto valve C.
X Insert connector ?into the cigarette
lighter socket (Y page 307) or into a 12 V
socket (Y page 307) in your vehicle.
X Turn the key to position 1(Y page 147)in
the ignition lock.
X Press on/off switch =on the tyre inflation
compressor to I.
The tyre inflation compressor is switched
on. The tyre is inflated.
i First, tyre sealant is pumped into the tyre.
The pressure can briefly rise to approx-
imately 500 kPa (5 bar/73 psi). 330
Flat tyreBreakdown assistance

Do not switch off the tyre inflation com-
pressor during this phase.
X Let the tyre inflation compressor run for
five minutes. The tyre should then have
attained a pressure of at least 180 kPa
(1.8 bar/26 psi).
! Do not operate the tyre inflation com-
pressor for longer than eight minutes at a
time without a break. It may otherwise
overheat.
The tyre inflation compressor can be oper-
ated again once it has cooled down.
If a pressure of 180 kP a(1 .8 ba r/26 psi) has
been achieved after five minutes, see
(Y page 331).
If a pressure of 180 kPa (1.8 ba r/26 psi) has
not been achieved after five minutes, see
(Y page 331).
Tyre pressure not reached If a pressure of 180 kPa
(1.8 ba r/26 psi) has
not been achieved after five minutes:
X Switch off the tyre inflation compressor.
X Unscrew the filler hose from the valve of
the faulty tyre.
X Very slowly drive forwards or reverse
approximately 10 m.
X Pump up the tyre again.
After a maximum of five minutes the tyre
pressure must be at least 180 kPa (1.8 bar/
26 psi). G
WARNING
If the required tyre pressure is not reached
after the specified time, the tyre is too badly
damaged. The tyre sealant cannot repair the
tyre in this instance. Damaged tyres and a tyre
pressure that is too low can significantly
impair the vehicle's braking and driving char-
acteristics. There is a risk of accident.
Do not continue driving. Contact a qualified
specialist workshop. Tyre pressure reached X
Switch off the tyre inflation compressor.
X Unscrew the filler hose from the valve of
the faulty tyre.
! After use, excess tyre sealant may run out
of the filler hose. This could cause stains.
Therefore, place the filler hose in the plastic
bag that contained the TIREFIT kit.
X Stow the tyre sealant bottle, the tyre infla-
tion compressor and the warning triangle.
X Pull away immediately. G
WARNING
A tyre temporarily sealed with tyre sealant
impairs the driving characteristics and is not
suitable for higher speeds. There is a risk of
accident.
You should therefore adapt your driving style
accordingly and drive carefully. Do not exceed
the specified maximum speed with a tyre that
has been repaired using tyre sealant.
The maximum speed for a tyre sealed with
tyre sealant is 80 km/h. The "max. 80 km/h"
sticker must be affixed to the instrument clus-
ter within the driver's field of vision.
X Stop after driving for approximately ten
minutes and check the tyre pressure with
the tyre inflation compressor.
The tyre pressure must now be at least
130 kPa (1.3 bar/19 psi). G
WARNING
If the required tyre pressure is not reached
after driving for a short period, the tyre is too
badly damaged. The tyre sealant cannot
repair the tyre in this instance. Damaged tyres
and a tyre pressure that is too low can signif-
icantly impair the vehicle's braking and driv-
ing characteristics. There is a risk of accident.
Do not continue driving. Contact a qualified
specialist workshop.
i In your vehicle, you will find a sticker with
the Mercedes-Benz Service24h telephone Flat tyre
331Breakdown assistance Z

number, e.g. on the B-pillar on the driver's
side.
X Correct the tyre pressure if it is still at least
130 kPa (1.3 ba r/19 psi) (see the fuel filler
flap for values).
X To increase the tyre pressure: switch on
the tyre inflation compressor. X
To reduce the tyre pressure: press pres-
sure release button Enext to pressure
gauge F.
X Stow the tyre sealant bottle, the tyre infla-
tion compressor and the warning triangle.
X Drive to the nearest qualified specialist
workshop and have the tyre changed there.
X Have the tyre sealant bottle replaced as
soon as possible at a qualified specialist
workshop. H
Environmental note
Have the used tyre sealant bottle disposed of
professionally, e.g. at a qualified specialist
workshop.
X Have the tyre sealant bottle replaced every
four years at a qualified specialist work-
shop. Changing a wheel and fitting the spare
wheel
Preparing the vehicle When using an emergency spare wheel or
spare wheel of a different size, you must not
exceed the maximum speed of 80 km/h.
G
WARNING
The wheel/tyre dimensions and the tyre type
of the spare wheel/emergency spare wheel
and the wheel to be replaced may differ. Fit-
ting a spare wheel/emergency spare wheel
may severely impair the driving characteris-
tics. There is a risk of accident.
To prevent hazardous situations:
R Adapt your driving style accordingly and
drive carefully.
R Never fit more than one spare wheel/emer-
gency spare wheel if the dimesions are dif-
ferent to those of the wheel being replaced.
R Only use a spare wheel/emergency spare
wheel briefly if the dimesions are different
to those of the wheel being replaced.
R Do not switch off ESP ®
.
R Have the spare wheel/emergency spare
wheel in question replaced at the nearest
qualified specialist workshop. Make sure
that the wheel/tyre dimensions and tyre
type are correct.
i Vehicles without an emergency spare
wheel/spare wheel are not equipped with
tyre-changing tools at the factory. For more
information on which tools are required to
perform a wheel change on your vehicle,
e.g. wheel chock, wheel wrench or centring
pin, consult a Mercedes-Benz Service
Centre.
X Prepare the vehicle as described
(Y page 329).
X If a trailer is coupled to the vehicle, uncou-
ple it.
X Remove the following items (depending on
the vehicle's equipment) from the stowage
well under the luggage compartment floor: 332
Flat tyreBreakdown assistance

Be sure to use the original-length wheel bolts
when refitting the original wheel after it has
been repaired.
X Clean the wheel and wheel hub contact
surfaces. X
Place the emergency spare wheel on the
wheel hub and push it on.
X Tighten the wheel bolts until they are fin-
ger-tight.
X Inflate the collapsible emergency spare
wheel (Y page 336).
Inflating the collapsible emergency
spare wheel !
Inflate the collapsible emergency spare
wheel using the tyre inflation compressor
before lowering the vehicle. The wheel rim
could otherwise be damaged. X
Pull connector ?and the air hose out of
the housing.
X Remove the cap from the valve on the col-
lapsible emergency spare wheel. X
Screw union nut :on the air hose onto the
valve.
X Make sure on/off switch Aof the tyre
inflation compressor is set to 0.
X Insert connector ?into the cigarette
lighter socket (Y page 307) or into a 12 V
socket ( Ypage 307) in your vehicle.
X Make sure that the key is in position
1(Y page 147)in the ignition lock.
X Press on/off switch Aon the tyre inflation
compressor to I.
The tyre inflation compressor is switched
on. The tyre is inflated. The tyre pressure is
shown on pressure gauge =.
! Do not operate the tyre inflation com-
pressor for longer than eight minutes at a
time without a break. It may otherwise
overheat.
The tyre inflation compressor can be oper-
ated again once it has cooled down.
X Pump the tyre to the specified tyre pres-
sure.
The specified tyre pressure is printed on
the yellow label of the emergency spare
wheel.
X When the specified tyre pressure has been
reached, press on/off switch Aon the
electric air pump to 0.
The tyre inflation compressor is switched
off.
X Turn the key to position 0in the ignition
lock.
X If the tyre pressure is higher than the speci-
fied pressure, press pressure release but-
ton ;until the correct tyre pressure has
been reached.
X Unscrew union nut :on the air hose from
the valve.
X Screw the valve cap onto the collapsible
emergency spare wheel valve again. 336
Flat tyreBreakdown assistance

X
Stow plug ?and the air hose in the lower
section of the blower housing.
X Stow the tyre inflation compressor in the
vehicle.
Lowering the vehicle G
WARNING
Tyre pressure that is too high or too low can
lead to a blow-out of the fitted emergency
spare wheel/spare wheel, particularly when
driving with a heavy load and increasing
speed. There is a risk of accident.
Check the tyre pressure of the emergency
spare wheel or spare wheel and adjust it.
When doing so, observe the specified tyre
pressure.
! Inflate the collapsible emergency spare
wheel using the tyre inflation compressor
before lowering the vehicle. The wheel rim
could otherwise be damaged.
X Place the ratchet ring spanner onto the
hexagon nut of the jack so that the letters
AB are visible.
X Turn the ratchet ring spanner until the vehi-
cle is once again standing firmly on the
ground.
X Place the jack to one side. G
WARNING
The wheels could work loose if the wheel nuts
and bolts are not tightened to the specified
tightening torque. There is a risk of accident. Have the tightening torque immediately
checked at a qualified specialist workshop
after a wheel is changed.
X Tighten the wheel bolts evenly in a cross-
wise pattern in the sequence indicated
(: toA). The tightening torque must be
150 Nm.
X Turn the jack back to its initial position and
store it together with the rest of the tyre-
change tool kit in the luggage compart-
ment.
X Transport the faulty wheel in the luggage
compartment.
For further information on stowing the col-
lapsible emergency spare wheel, see
(Y page 328).
i If you are driving with the emergency
spare wheel fitted, the tyre pressure loss
warning system cannot function reliably.
Only restart the tyre pressure loss warning
system when the defective wheel has been
replaced with a new wheel. Battery (vehicle)
Important safety notes
Work on the battery, e.g. removing or instal-
ling, requires specialist knowledge and the
use of special tools. Therefore, always have
work on the battery carried out at a qualified
specialist workshop. G
WARNING
Work carried out incorrectly on the battery
can, for example, lead to a short circuit and
damage your vehicle's electronic system. This
can disrupt driving safety systems such as
ABS (anti-lock braking system) or ESP ®
(Elec-
tronic Stability Program).
R If ABS malfunctions, the wheels can lock
during braking. This limits the steerability
of the vehicle when braking and the braking Battery (vehicle)
337Breakdown assistance
Z

wheels and tyres for damage. Hidden tyre
damage could also be causing the unusual
handling characteristics. If you find no
signs of damage, have the tyres and wheels
checked at a qualified specialist workshop.
R When parking your vehicle, make sure that
the tyres do not get deformed by the kerb
or other obstacles. If it is necessary to drive
over kerbs, speed humps or similar eleva-
tions, try to do so at an obtuse angle. Oth-
erwise, the tyres, particularly the sidewalls,
can get damaged. Notes on regularly inspecting wheels
and tyres G
WARNING
Damaged tyres can cause tyre inflation pres-
sure loss. As a result, you could lose control
of your vehicle. There is a risk of accident.
Check the tyres regularly for signs of damage
and replace any damaged tyres immediately.
R Regularly check the wheels and tyres of
your vehicle for damage (e.g. cuts, punctu-
res, tears, bulges on tyres and deformation,
cracks or severe corrosion on wheels), at
least every 14days, as well as after driving
off-road or on rough roads. Damaged
wheels can cause a loss of tyre pressure.
R Regularly check the tyre tread depth and
the condition of the tread across the whole
width of the tyre (Y page 351). If neces-
sary, turn the front wheels to full lock in
order to inspect the inner side of the tyre
surface.
R All wheels must have a valve cap to protect
the valve against dirt and moisture. Do not
fit anything onto the valve other than the
standard valve cap or other valve caps
approved by Mercedes-Benz for your vehi-
cle. Do not fit any other valve caps or sys-
tems, e.g. tyre pressure monitoring sys-
tems.
R Regularly check the pressure of all the tyres
including the emergency spare wheel or the spare wheel, particularly prior to long trips,
and correct the pressure as necessary
(Y
page 353). Tyre tread
G
WARNING
Insufficient tyre tread will reduce tyre trac-
tion. The tyre is no longer able to dissipate
water. This means that on wet road surfaces,
the risk of aquaplaning increases, in particular
where speed is not adapted to suit the driving
conditions. There is a risk of accident.
If the tyre pressure is too high or too low, tyres
may exhibit different levels of wear at differ-
ent locations on the tyre tread. Thus, you
should regularly check the tread depth and
the condition of the tread across the entire
width of all tyres.
Minimum tyre tread depth for:
R summer tyres: 3 mm
R M+S tyres: 4 mm
For safety reasons, replace the tyres before
the legally prescribed limit for the minimum
tyre tread depth is reached.. Notes on selecting, fitting and replac-
ing tyres
R Only fit tyres and wheels of the same type
and make.
R Only fit tyres of the correct size onto the
wheels.
R After fitting new tyres, run them in at mod-
erate speeds for the first 100 km, as they
only reach their full performance after this
distance.
R Do not drive with tyres which have too little
tread depth, as this significantly reduces
the traction on wet roads (aquaplaning).
R Replace the tyres after six years at the lat-
est, regardless of wear. This also applies to
the emergency spare wheel/spare wheel. Operation
351Wheels and tyres Z

If you have fitted M+S tyres:
X
Check the tyre pressures (Y page 353).
X Restart the tyre pressure loss warning sys-
tem (Y page 355).
After fitting a spare wheel or an emergency
spare wheel, do not drive faster than
80 km/h. Snow chains
G
WARNING
If you have fitted snow chains to the front
wheels, they may scrape against the vehicle
body or chassis components. This could
cause damage to the vehicle or the tyres.
There is a risk of an accident.
To avoid hazardous situations:
R never fit snow chains on the front wheels
R fit snow chains to the rear wheels in pairs.
! Vehicles with steel wheels: if you wish
to fit snow chains to steel wheels, make
sure that you remove the respective
wheels' hubcaps first. The hubcaps may
otherwise be damaged.
For safety reasons, Mercedes-Benz recom-
mends that you only use snow chains that
have been specially approved for your vehicle
by Mercedes-Benz, or that are of a corre-
sponding standard of quality.
If you intend to fit snow chains, please bear
the following points in mind:
R snow chains cannot be fitted to all wheel-
tyre combinations. Permissible wheel-tyre
combinations (Y page 357).
R only use snow chains when the road sur-
face is completely snow-covered. Remove
the snow chains as soon as possible when
you come to a road that is not snow-cov-
ered.
R local regulations may restrict the use of
snow chains. Observe the appropriate reg-
ulations if you wish to fit snow chains. R
Do not exceed the maximum permissible
speed of 50 km/h.
R Snow chains must not be fitted to the emer-
gency spare wheel, e.g. a collapsible emer-
gency spare wheel.
i You can deactivate ESP ®
(Y page 67)
when pulling away with snow chains fitted.
This way you can allow the wheels to spin
in a controlled manner, achieving an
increased driving force (cutting action). Tyre pressure
Tyre pressure specifications
G
WARNING
Tyres with too low or too high tyre pressure
contain the following hazards:
R they can burst, in particular if the vehicle is
heavily laden or when driven at high
speeds.
R the tyres can wear excessively and/or
unevenly, which can severely impair tyre
traction.
R the driving, steering and braking character-
istics may be severely impaired.
There is a risk of accident.
Follow recommended tyre inflation pressures
and check the pressure of all the tyres includ-
ing the spare wheel:
R at least every two weeks
R if the load changes
R before beginning a long journey
R for changed operating conditions, e.g. off-
road driving
If necessary, correct the tyre pressure.
You will find a table of tyre pressures for var-
ious operating conditions on the inside of
your vehicle's fuel filler flap.
Operation with an emergency spare
wheel: the applicable value is stated on the
wheel and in the "Wheel/tyre combinations"
section (Y page 357). Tyre pressure
353Wheels and tyres Z