2005 BMW 745i tire pressure

Controls
67Reference
At a glance
Driving tips
Communications
Navigation
Entertainment
Mobility
What you will need
1Screwdriver handle
2Emergency-release tool
310 mm open-end wrench
You will find the required tools in the
onboard tool kit mounted on the inside of
the luggage compartment lid, refer to
page201.
Insert the emergency-release tool in the
screwdriver handle as shown in the illustra-
tion.
Releasing
1.Remove the floor mat and the cover on
the spare tire
2.Guide the emergency-release tool with
the screwdriver handle into the open-
ing, arrow1
3.Apply the open-end wrench to the
hexagon on the emergency-release
tool.
Press against the resistance from the
spring to guide the emergency-release
tool all the way in, then hold it in place.
Turn the emergency-release tool in the
direction indicated by arrow2, continu-
ing until you hear the mechanism snap
into place and feel resistance; maintain
pressure on the tool after the mecha-
nism engages
4.Use the open-end wrench to turn the
emergency-release tool against the
drive unit's mechanical resistance, con-
tinuing to rotate it in arrow direction2
until you feel a substantial increase in
turning effortTo prevent possible damage to the
rear brakes, always make sure that
the parking brake is completely released
before driving the vehicle.<
5.Return the tools to their places
6.Return the spare tire cover and the floor
mat to their original locations.
Have any defects repaired at the
nearest BMW center. The technicians
can also return the parking brake to normal
operational status after it has been
released manually in response to malfunc-
tion.<
Following manual release, the actual
status of the parking brake may vary
from that displayed by the indicator lamp.<
Operation after interruptions in
power supply
The parking brake may only be used
again, if it was released manually after
an interruption in power supply, i.e. as a
r esu lt o f a dis ch ar ged or d isc on ne cte d bat -
tery. If this is not done, the parking brake
may fail to operate correctly. Even with the
parking brake engaged, there would be a
danger of the vehicle rolling on steep
hills.<
Once the electrical power supply has been
restored you can again use the parking
brake:
With the ignition on and the
vehicle stationary, briefly press
the button three times at inter-
vals of approx. 5 seconds. This
initializes the system as follows:
>Initializing the disengaged setting

Controls
95Reference
At a glance
Driving tips
Communications
Navigation
Entertainment
Mobility
Have the system checked as soon as pos-
sible.
Display of the previously described
malfunction on Canadian models.
Dynamic Drive
The concept
Dynamic Drive minimizes body roll and
optimizes vehicle stability during cornering
and evasive maneuvers.
Active stabilizers at the front and rear axles
form the basis for Dynamic Drive. Suspen-
sion compliance adapts to suit driving con-
ditions, varying from performance-oriented
during cornering to smooth and comfort-
oriented when the vehicle is proceeding in
a straight line.
The system assumes operational status
each time you start the engine.
Driving with Dynamic Drive
During vehicle operation, the system con-
tinuously runs through closed-loop control
cycles lasting only fractions of a second.
Malfunction
The warning lamp lights up, accom-
panied by a status message in the
Check Control. Please take note of
the additional information on the Control
Display. A malfunction has occurred in the
system. Have the system checked as soon
as possible.
If the Dynamic Drive system switches
off in response to malfunction, please
remember to adapt your speed accord-
ingly, especially in curves.
The suspension will be noticeably softer
and the vehicle will display a greater ten-
dency to tilt during cornering and in cross-
winds.
If a Check Control message stating that you
should stop appears in addition to the red
symbol, stop immediately and switch off
the engine. In this case the oil level in the
reservoir may have dropped below the min-imum, possibly owing to a leak in the
hydraulic system.
Please observe the additional instructions
provided on the Control Display.<
EDC Electronic Damping
Control*
The suspension responds to changes in
factors such as road surface, or operating
conditions such as steering and braking, by
adapting to the new conditions within frac-
tions of a second.
Two programs are available; they can be
selected in the "Settings" menu.
Comfort mode
The Comfort mode is suitable for use
throughout the vehicle's entire speed range
and regardless of load.
Sport program
You should select the Sport program for
consistently performance-oriented
response from shock absorbers and steer-
ing.
Flat Tire Monitor
The concept
The Flat Tire Monitor keeps track of the
inflation pressures in the four fitted tires as
you drive. The system provides an alert
whenever the inflation pressure drops sig-
nificantly in relation to the pressure another
tire.

Technology for comfort, convenience and safety
96 The check of the tire inflation pressure is
based on monitoring the relative speeds of
the wheels. A flat tire is detected and
reported on the basis of a deviation in cer-
tain speed ratios.
Functional requirements
So that the Flat Tire Monitor can learn the
correct inflation pressure, please perform
the following:
1.Check the inflation pressures in all tires
2.Compare with the inflation pressure
table on page189 and correct if neces-
sary
3.Initialize the system.
System limits
The Flat Tire Monitor cannot indicate
sudden severe tire damage caused by
outside factors and does not detect a natu-
ral, even pressure drop in all four tires.<
In the following situations, on the other
hand, there can be delays in detecting tire
pressure losses, and even system failure:
>When you are driving on snow-covered
or slippery road surfaces
>In the case of performance-oriented
driving: slip on the drive wheels, high
lateral acceleration
>False alarms and undetected loss of
pressure may occur when you are driv-
ing with snow chains fitted.
Initializing system
Perform the initialization immediately
after correcting the inflation pressure,
changing a tire or changing a wheel or all
wheels. A drive is necessary for this pur-
pose.<
1.Start the engine, but do not drive off
2.Select "RPA" from the "Settings" menu
and confirm your selection. The initial-
ization menu appears 3.Select "SET" and confirm your selection
4.Drive off.
"FTM is being initialized" is displayed as the
status.
It takes at least 10 minutes before the Flat
Tire Monitor can detect and report a flat
tire.
When driving with snow chains, do
not initialize the system.<
Select and confirm to exit from the
menu.
Indication of a flat tire
The warning lamp lights up red,
accompanied by a status message
in the Check Control. In addition, an
acoustic signal sounds. A flat tire or a major
air loss has occurred.
1.Reduce speed and stop the vehicle
carefully. Avoid sudden braking and
steering maneuvers
2.Identify damaged tire
If identification is not possible,
contact your BMW center.<
3.Replace the damaged tire, refer to
Changing wheels on page204.

Controls
97Reference
At a glance
Driving tips
Communications
Navigation
Entertainment
Mobility
Vehicles with run-flat tires:
1.Cautiously reduce the vehicle speed to
below 50 mph/80 km/h. Avoid sudden
braking and steering maneuvers. Do not
exceed a vehicle speed of 50 mph/80
km/h
Due to the reinforcement on the
side walls of the run-flat tires,
inflation pressure loss can not usually
be recognized from the outside, refer to
Run-flat tires on page206.<
2.To continue driving, comply with the
instructions for driving with damaged
tires on page206.
Malfunction
The indicator lamp lights up yellow,
accompanied by a status message
in the Check Control. The Flat Tire
Monitor has malfunctioned or failed. Have
the system checked as soon as possible.
Self-leveling suspension*
Malfunction
A Check Control message appear-
ing together with this symbol indi-
cates a malfunction in the self-level-
ing suspension. Please take note of the
additional information on the Control Dis-
play.
Stop and inspect the vehicle. If the rear of
the vehicle is visibly lower than the front,
possibly accompanied by a tilt noticeable
when you compare the left rear with the
right rear, please respond by immediately
proceeding to the nearest BMW center.
Drive with appropriate caution in the mean-
time. The vehicle has reduced ground
clearance and driving comfort may be
noticeably reduced. Even if the attitude of
the vehicle is normal, you should consult
the nearest BMW center if the warning
lamp indicates a system fault.
Brake Force Display
The Brake Force Display indicates the
intensity with which you are applying your
brakes to drivers of following vehicles.
The display consists of two stages:
>Normal braking:
The brake lamps in the tail lamp assem-
blies and the high-mount brake lamp on
the rear tray light up during braking
>Heavy braking and braking with ABS:
The rear lamps also light up with the
same intensity as the standard brake
lamp units to enhance the warning
effect of the brake lamps.

Driving tips
123Reference
At a glance
Controls
Communications
Navigation
Entertainment
Mobility
Hydroplaning
When driving on wet or slushy roads,
reduce road speed. If you do not, a
wedge of water can form between tires and
road surface. This phenomenon is referred
to as hydroplaning, and is characterized by
a partial or complete loss of contact
between tires and road surface, ultimately
undermining your ability to steer and brake
the vehicle.<
Driving through water
Only drive through water with a maxi-
mum depth of 1 ft/30 cm, and then
only at walking speed at the most. Other-
wise, the vehicle's engine, the electrical
systems and the transmission may be dam-
aged.<
Safe braking
Your BMW is equipped with ABS as stan-
dard equipment. The best way to brake is
to apply maximum pressure to the brake
pedal during emergency: full brake applica-
tion. Since the vehicle maintains steering
responsiveness, you can nevertheless
avoid possible obstacles with a minimum
of steering effort.
Pulsation at the brake pedal combines with
sounds from the hydraulic circuits to indi-
cate to the driver that ABS is in its active
mode.
Driving in wet conditions
While driving in wet conditions and in heavy
rain, it is a good idea to apply light pressure
to the brake pedal every few miles. Monitor
traffic conditions to ensure that this maneu-
ver does not endanger other road users.
The heat generated in this process helps
dry the pads and rotors to ensure that full
braking efficiency will then be available
when you need it.
Hills
To prevent overheating and reduced
efficiency of the brake system, drive
long or steep downhill gradients in the gear
in which the least braking is required. Otherwise, even light but consistent pedal
pressure can lead to high temperatures,
brake wear and possibly even brake fail-
ure.<
You can further enhance the engine's brak-
ing effect by selecting a lower gear in the
automatic transmission's manual mode,
downshifting as far as first gear on
extremely steep stretches, refer to
page70. This strategy helps you avoid
placing excessive loads on the brake sys-
tem.
Never allow the vehicle to coast with
the transmission in Neutral – or with
the engine switched off – as there is no
engine braking when the transmission is in
Neutral, and no power-assist for brakes
and steering when the engine is not run-
ning.
Never allow floor mats, carpets or any other
objects to protrude into the area around the
accelerator and brake pedals and obstruct
their movement.<
Corrosion on brake rotors
When the vehicle is driven only occasion-
ally, during extended periods when the
vehicle is not used at all, and in operating
conditions where brake applications are
less frequent, there is an increased ten-
dency for corrosion to form on rotors, while
contaminants accumulate on the brake
pads. This occurs because the minimal
pressure which must be exerted by the
pads during brake applications to clean the
rotors is not reached.
Should corrosion form on the brake rotors,
the brakes will tend to respond with a pul-
sating effect that even extended applica-
tion will fail to cure.
Mobile communications devices in
vehicle
BMW does not recommend using
mobile communications devices, e.g.
portable phones, in the interior of the vehi-
cle without a direct connection to an out-
side antenna. Otherwise the vehicle elec-
tronics and mobile communications device
can affect each other. In addition, it is not

Using the phone in your vehicle
178 vide a detailed description of the situa-
tion.<
For technical reasons, the emergency
call cannot be guaranteed under
unfavorable conditions.<
Under certain conditions, an emergency
call is started automatically immediately
after a severe accident. The automatic
emergency call is not affected by the emer-
gency call button being pressed.
Commissioning
BMW portable phone
1.Pull back the cradle slightly
2.Insert the portable phone.
For portable phones with SIM
card: First switch on portable
phone and enter PIN, then insert.<
Before driving, place the BMW porta-
ble phone in the cradle. You can then
control the portable phone with the button
in the steering wheel, the Control Center,
the telephone keypad or the voice com-
mand system.<
Switching your BMW portable phone
on and off
You can switch your BMW portable
phone on and off by maintaining
extended pressure on the telephone key-
pad.
Entering lock code
If, after switching on the BMW portable
phone, you are requested by a message on
the Control Display to enter the lock code:
1.Enter the lock code, e.g. 1234
2.Press the button
Getting started
Making a call
1.Enter the desired phone number
2.Press the button
The phone number appears in the Control
Display's status line.
Always remember to enter the com-
plete telephone number, i.e. the area
code, even if you are currently in the same
area as the number that you wish to con-
tact.<
Ending a call
Press the button
1.{Dial number}
2.Enter the phone number
>Listen to the entered numerical
sequence:
{Read out}
>Delete the entire number:
{Delete}
3.{Dial}.

Wheels and tires
188
Wheels and tires
Tire inflation pressure
Information for your safety
It is not merely the tire's service life, but
also driving comfort and – to a great extent
– driving safety that depend on the condi-
tion of the tires and the maintenance of the
specified tire pressure.
Check the tire inflation pressure regu-
larly and correct it if necessary,
including the spare tire: at least every two
weeks and before beginning a longer trip.
If you fail to observe this precaution you
may be driving on tires with incorrect tire
pressures, a condition that can not only
compromise your vehicle's stability, but
also lead to tire damage and the risk of an
accident.
Do not drive with deflated, i.e. flat tires,
except run-flat tires. A flat tire will seriously
impair your vehicle's handling and braking
response. Attempts to drive on a flat tire
can lead to loss of control over the vehi-
cle.<
Checking inflation pressure
Only check tire inflation pressure when the
tires are cold. This means after a maximum
of 1.25 miles/2 km driving or when the
vehicle has been parked for at least
2 hours. When tires are warm, the tire infla-
tion pressure increases.
After correcting the inflation pressure(s),
always reinitialize the Flat Tire Monitor,
refer to page96.
Inflation pressures for standard tires
The inflation pressures for your standard
tires can be found on the door pillar when
you open the driver's door.
Inflation pressures for other tire
sizes
The table below provides all the correct
inflation pressures for the specified tire
sizes at ambient temperature.
After correcting the inflation pres-
sure(s), always reinitialize the Flat Tire
Monitor, refer to page96.<
Tire size
The inflation pressures apply to the tire
sizes approved and tire brands recom-
mended by BMW; a list of these is available
from your BMW center.

Mobility
189Reference
At a glance
Controls
Driving tips
Communications
Navigation
Entertainment
745i, 745Li
760i, 760Li
Tire sizePressure specifications in psi/kPa
All pressure specifications in
the table are indicated in psi/
kilopascal with cold tires.
Cold = ambient temperature
245/50 R 18 100 V M+S
245/55 R 17 102 W
245/50 R 18 100 W
245/55 R 17 102 Q M+S
245/50 R 18 100 Q M+S32/220 35/240 35/240 42/290
Front: 245/45 R 19 98 W 32/220 - 35/240 -
Rear: 275/40 R 19 101 W - 35/240 - 42/290
Front: 245/40 R 20 95 Y 32/220 - 35/240
Rear: 275/35 R 20 98 Y - 35/240 - 42/290
More details on the permitted load and weights can be found on page216.
Tire sizePressure specifications in psi/kPa
All pressure specifications in
the table are indicated in psi/
kilopascal with cold tires.
Cold = ambient temperature
245/50 R 18 100 V M+S
245/50 R 18 100 W
245/50 R 18 100 Q M+S35/240 38/260 38/260 42/290
Front: 245/45 R 19 98 Y 35/240 - 38/260 -
Rear: 275/40 R 19 101 Y - 38/260 - 42/290
Front: 245/40 R 20 95 Y 35/240 - 38/260
Rear: 275/35 R 20 98 Y - 38/260 - 42/290
More details on the permitted load and weights can be found on page216.