2009 MERCEDES-BENZ SLR inflation pressure

290 OperationTires and wheelsThoroughly clean the mounting face of
wheels and brake disks, i.e. the inner side
of the wheels/tires, during each rotation.
Check for and ensure proper tire inflation
pressure.
For information on wheel change, see the
“Practical hints” section (
page 365).
Anti-theft wheel nuts
Your vehicle is equipped with anti-theft
wheel nuts that prevent the theft of your
vehicle’s wheels.
1Anti-theft wheel nut
2Wheel nut key
Removing anti-theft wheel nuts

Unscrew anti-theft wheel nut1 using
wheel nut key2.

Replace anti-theft wheel nut1 with
one of the regular wheel bolts.

Fasten the wheel bolt and tighten it
with a torque wrench to a tightening
torque of 95 lb-ft (130 Nm).
Warning!
G
Have the tightening torque checked after
changing a wheel. Wheels could become
loose if not tightened with a torque of
95 lb-ft (130 Nm).
Only use Genuine Mercedes-Benz wheel
bolts specified for your vehicle’s rims.
Warning!
G
Pull the parking brake lever up as many
notches as possible and move the gear se-
lector lever to park positionP, before loos-
ening the wheel bolts. Otherwise the vehicle
may move and cause an accident and/or
serious personal injury. !
Do not use air tools, such as an impact
wrench, when installing or removing the
anti-theft wheel nuts. An impact wrench can
damage the anti-theft wheel nuts and the wheel
nut key, or cause them to malfunction.
!
Store wheel bolts and anti-theft wheel nuts
not currently in use in a safe place to avoid
damage to the threads.

315 Practical hints
What to do if ...
Problem
Possible cause/consequence
Suggested solution
H
USA only:
Combination low tire
pressure/TPMS malfunction
telltale for the TPMS illuminates
continuously.
Canada only:
Low tire pressure telltale for the
TPMS illuminates continuously.
The TPMS detects a loss of pressure in at
least one tire.

Carefully bring the vehicle to a halt,
avoiding abrupt steering and braking
maneuvers. Observe the traffic
situation around you.

Read and observe messages in the
multifunction display.
If the tire inflation pressure in the respec-
tive tire(s) has (have) been corrected,
the combination low tire pressure/TPMS
malfunction telltale goes out after a few
minutes of driving.
H
USA only:
Combination low tire
pressure/TPMS malfunction
telltale for the TPMS flashes
60 seconds and then stays
illuminated.
There is a malfunction in the TPMS.

Read and observe messages in the
multifunction display.

Have the TPMS checked by an
authorized Mercedes-Benz Center.
After the malfunction has been remedied,
the combination low tire pressure/TPMS
malfunction telltale goes out after a few
minutes of driving.
(Continued on next page)

316 Practical hintsWhat to do if ...Warning!
G
Each tire should be checked every other
week when cold and inflated to the inflation
pressure recommended by the vehicle man-
ufacturer on the Tire and Loading Informa-
tion placard on the driver’s door B-pillar
(page 269) or, if available, the tire infla-
tion pressure label on the inside of the fuel
filler flap. If your vehicle has tires of a differ-
ent size than the size indicated on the Tire
and Loading Information placard or, if avail-
able, the tire inflation pressure label, you
should determine the proper tire inflation
pressure for those tires.
As an added safety feature, your vehicle has
been equipped with a tire pressure monitor-
ing system (TPMS) that illuminates a low tire
pressure telltale when one or more of your
tires is significantly underinflated.
Accordingly, when the low tire pressure tell-
tale illuminates, you should stop and check
your tires as soon as possible, and inflate
them to the proper pressure. Driving on a
significantly underinflated tire causes the
tire to overheat and can lead to tire failure.
Underinflation also reduces fuel efficiency
and tire tread life, and may affect the vehi-
cle’s handling and stopping ability. Please
note that the TPMS is not a substitute for
proper tire maintenance, and it is the driv-
er’s responsibility to maintain correct tire
pressure, even if underinflation has not
reached the level to trigger illumination of
the TPMS low tire pressure telltale.
USA only:
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate
when the system is not operating properly.
The TPMS malfunction indicator is com-
bined with the low tire pressure telltale.
When the system detects a malfunction, the
telltale will flash for approximately
one minute and then remain continuously
illuminated. This sequence will continue
upon subsequent vehicle start-ups as long
as the malfunction exists. When the mal-
function indicator is illuminated, the system
may not be able to detect or signal low tire
pressure as intended.
TPMS malfunctions may occur for a variety
of reasons, including the installation of
replacement or alternate tires or wheels on
the vehicle that prevent the TPMS from
functioning properly. Always check the
TPMS malfunction telltale after replacing
one or more tires or wheels on your vehicle
to ensure that the replacement or alternate
tires and wheels allow the TPMS to continue
to function properly.

329 Practical hints
What to do if ...
Left display
Right display
Possible cause/consequence
Possible solution
Tire pressure
displayed after
driving for
a few minutes
The tire inflation pressure is being checked.

Drive the vehicle for a few minutes.
Tire Pressure
Monitor
Inoperative
The TPMS is malfunctioning

Have the TPMS checked by an
authorized Mercedes-Benz Center.
Tire Pressure
Monitor
Inoperative
No Wheel Sensors
There are wheels without appropriate wheel
sensors mounted (e.g. winter tires).

Have the TPMS checked by an autho-
rized Mercedes-Benz Center.

Have appropriate wheel sensors in-
stalled by an authorized
Mercedes-Benz Center.
Tire Pressure
Monitor
Wheel Sensor Missing
One or more sensors are defect (e.g. battery
is empty).
The respective tire is indicated by
---

instead of the tire inflation pressure in the
multifunction display.

Have the TPMS checked by an autho-
rized Mercedes-Benz Center.

Have appropriate wheel sensors in-
stalled by an authorized
Mercedes-Benz Center.

330 Practical hintsWhat to do if ...Left display
Right display
Possible cause/consequence
Possible solution
Tire Pressure
Monitor
Wheel Sensor Missing
One or more wheels without appropriate
wheel sensors mounted (e.g. spare wheel).
The respective tire is indicated by
---

instead of the tire inflation pressure in the
multifunction display.

Have the TPMS checked by an autho-
rized Mercedes-Benz Center.

Have appropriate wheel sensors in-
stalled by an authorized
Mercedes-Benz Center.
Tire Pressure
Monitor
Currently
Unavailable
The TPMS is unable to monitor the tire pres-
sure due to a nearby radio interference
source.
As soon as the causes for the malfunc-
tion are no longer present, the TPMS
automatically becomes active again
after a few minutes driving.
Warning!
G
Do not drive with a flat tire. A flat tire affects
the ability to steer or brake the vehicle. You
may lose control of the vehicle. Continued
driving with a flat tire will cause excessive
heat build-up and possibly a fire.

351 Practical hints
What to do if ...
Left display
Right display
Possible cause/
consequence
Possible solution
H
Please correct
the tire pressure.
The tire inflation pres-
sure is too low in one or
more tires.

Check and correct tire inflation pressure as required
(page 270).
Caution
Tire Defect
One or more tires are
deflating.
The respective tire is in-
dicated in the multi-
function display.

Carefully bring the vehicle to a halt, avoiding abrupt steering and
braking maneuvers. Observe the traffic situation around you.

Temporarily repair tire using TIREFIT (
page 365) or contact
Roadside Assistance. If tire cannot be temporarily repaired using
TIREFIT, contact Roadside Assistance.

Have the damaged wheel repaired or replaced at an authorized
Mercedes-Benz Center.
Check Tires
The tire inflation pres-
sure in one or more
tires is already below
the minimum value.
The respective tire is in-
dicated in the multi-
function display.

Carefully bring the vehicle to a halt, avoiding abrupt steering and
braking maneuvers. Observe the traffic situation around you.

Check the tires. If no damage visible, check and adjust tire pres-
sure as required.

Temporarily repair tire using TIREFIT (
page 365) or contact
Roadside Assistance. If tire cannot be temporarily repaired using
TIREFIT, contact Roadside Assistance.

Have the damaged wheel repaired or replaced at an authorized
Mercedes-Benz Center.

365 Practical hints
Flat tire
Flat tire
The vehicle is equipped with the TIREFIT
kit.Preparing the vehicle
Park the vehicle in a safe distance from
moving traffic on a hard, flat surface
when possible.

Turn on the hazard warning flashers.

Turn the steering wheel so that the
front wheels are in a straight ahead
position.

Set the parking brake.

Move the gear selector lever to park
positionP.

Turn off the engine (
page 56).

Remove the SmartKey from the starter
switch.

Have any passenger exit the vehicle at
a safe distance from the roadway.
Sealing tires with TIREFIT
Small tire punctures, particularly those in
the tread, can be sealed with TIREFIT.
TIREFIT can be used in ambient tempera-
tures down to -4°F (-20°C).

Foreign objects (e.g. screws or nails)
should not be removed from the tire.

Take TIREFIT, the sticker, and the
electric air pump out of the trunk.
!
A wheel change should only be carried out
at an authorized Mercedes-Benz Center. Other-
wise there is a danger of damaging the vehicle by
jacking it up incorrectly.
i
Open door only when conditions are safe to
do so.
Warning!
G
TIREFIT is a limited repair device. TIREFIT
cannot be used for cuts or punctures larger
than approximately 0.16 in (4 mm) and tire
damage caused by driving with extremely
low tire inflation pressure, or on a flat tire, or
a damaged wheel.
Do not drive the vehicle under such
circumstances.
Contact your nearest Mercedes-Benz
Center for assistance or call Roadside
Assistance. !
After using TIREFIT, the tire inflation
pressure sensor may have to be replaced.


367 Practical hints
Flat tire

Screw the air pump’s air hose5 onto
flange6 of the TIREFIT container.

Stick TIREFIT container1 upside
down into notch3 of the electric air
pump.
7Tire valve
8Electric air pump switch
9Pressure gauge and vent screw
aFiller hose

Unscrew the valve cap from tire
valve7.

Screw filler hosea onto tire valve7.

Close vent screw9 on pressure
gauge.

Insert electrical plug4 into vehicle
cigarette lighter socket.

Turn the SmartKey in the starter switch
to position1 (
page 40).

PressI on electric air pump switch8.
The electric air pump should now
switch on and inflate the tire.After 5 minutes, the pressure gauge must
display at least 26 psi (1.8 bar). The air
hose can become hot during inflation.
Please exercise appropriate caution.

If this tire inflation pressure is not at-
tained, turn off the electric air pump,
detach the filler hose from the tire
valve, and drive vehicle back and forth
very slowly approximately 30 ft (10 m).
This serves to better distribute the
TIREFIT sealant material inside the tire.

Unscrew the air pump’s air hose5
from flange6 of the TIREFIT
container.

Screw air hose5onto tire valve7.

Inflate the tire again.
Warning!
G
Observe safety instructions on air pump
label.
!
Do not operate the electric air pump longer
than 8 minutes without interruption. Otherwise it
may overheat.
You may operate the air pump again after it has
cooled off.