brake BMW 320i 2001 Service Manual

178n
On vehicles with an automatic trans-
mission, the ATC (Adaptive Transmis-
sion Control) uses a number of factors
to calculate the gear which provides the
maximum efficiency. In this process, it
considers your individual driving style
as well as current driving conditions.
ATC recognizes your personal driving
style from the positions and movements
of the accelerator pedal, deceleration
when braking, and lateral acceleration
through curves. Based on different shift
characteristics Ð from comfort-oriented
to performance-oriented Ð ATC will
select the appropriate gear.
460us173
In order to include driving conditions in
its calculations, ATC registers curves
and both uphill and downhill gradients.
For example, if you maintain speed
through a curve, the transmission does
not shift up. On uphill gradients, it shifts
up only when the engine speed
increases in order to make more effi-
cient use of power reserves. On down-
hill gradients, ATC shifts down when
the speed of the vehicle increases and
the driver must apply the brakes.
ATC
*

180n
ASC+T/DSC
*
Highly sensitive sensors monitor the
number of revolutions of the wheels.
When equipped with DSC, they also
monitor steering angle, lateral accelera-
tion, brake pressure and the movement
of the vehicle around its vertical axis.
If differences in the wheel speeds occur,
ASC+T counteracts the danger of
wheelspin by reducing engine torque; if
necessary, ASC will also respond by
applying the brakes to the rear wheels.
In addition, DSC permanently monitors
the vehicle's current operating condition
and compares it with an ideal condition
that is calculated from the sensor's
signals. If deviations from this occur
(understeering or oversteering, for
instance), DSC can stabilize the vehicle
in fractions of a second by reducing
engine output and with the assistance of
braking intervention at individual
wheels. As a result, dangerous skids can
be prevented even as they are just
beginning, but only within the laws of
physics.
You may need some time to become
accustomed to this system's interven-
tion. However, it provides optimum
drive force and driving stability.
The braking intervention may be
accompanied by sounds specific to the
system.

182n
Four-wheel driveThe transmission of power to the four
drive wheels is provided permanently
through a transfer box. The distribution
of torque between the front and rear
axles is 38% to 62%.
Traditional differential locks at the front
and rear axles and in the transfer box
are not required. Their function is taken
over by automatic braking intervention
at all four wheels. These traction inter-
ventions are governed by Automatic
Differential Brake (ADB-X), a sub-func-
tion of DSC.
If a wheel tends to slip, it is braked
automatically by ADB-X until it once
again gains traction, and drive force
can be transmitted to that wheel. In
addition, the drive force is distributed to
the remaining wheels during this 530us133
system intervention. Engine output is
also reduced if necessary.
When the DSC is deactivated, the
ADB-X traction intervention is set for
the maximum drive force. However, the
engine intervention and the stability
controls are no longer available. For
this reason, DSC should only be deacti-
vated in the exceptional circumstances
described on page 84.
The BMW 325xi and 330xi are not
intended for off-road operation. But the
permanent four-wheel drive provides a
high degree of driving stability and trac-
tion on all road conditions and surfaces.
It supports you in critical driving condi-
tions, e.g. in extreme winter conditions
or on loose road surfaces.

Everything from A to ZA
ABS (Antilock Brake
System)22,118
Accessories6
Activated-charcoal
filter102,171
Adaptive Transmission
Control (ATC)66,178
Adding engine oil139
Adding washer
fluid138,195
Adjusting the backrest48
Adjusting the steering
wheel51
Adjusting the
temperature94
Adjusting the thigh support
area49
Air conditioner92
Air distribution94,100
Air nozzles92,98
Air outlets92,98
ventilation92,98
Air pressure125
Air supply94,101
Airbags21,55,151,179
Alarm system42
Antenna124
Antenna, Diversity181
Antifreeze142
radiator122 Antilock Brake System
(ABS)22,118
Anti-theft alarm system42
Aquaplaning117,125
Armrest105
ASC+T (Automatic Stability
Control plus Traction)22
Ashtray107
front107
rear108
ATC (Adaptive Transmission
Control)66,178
Attach car vacuum
cleaner108
AUC (Automatic
recirculated-air
control)101
Automatic car washes146
Automatic climate
control98
removing condensation
from the windows101
Automatic cruise control72
Automatic dimming, interior
rearview mirror53
Automatic recirculated-air
control (AUC)101
Automatic Stability Control
plus Traction (ASC+T)22
Automatic transmission with
Steptronic21,66 Automatic windshield
washer70
Average consumption78
Average speed78
Axle loads194
B
Backrest, adjusting48
Backup lamps65
bulb replacement161
Battery168,196
capacity196
charge170
discharged173
removal and
installation169
Battery charge current20
Battery safety terminal169
Belts54
Beverage holder105
Blower94,101
BMW High Performance
Synthetic Oils140
BMW sports seat49
Bore192
Brake fluid143
Brake hydraulic system20
Brake lamps, bulb
replacement161
Brake pads22
Brake system121 Brakes120
malfunctions121
Break-in procedures116
Bulb replacement158
C
California Proposition
65 Warning153
Capacities195
Car Memory53
Car radio124
refer also to the separate
Owner's Manual
Car radio
reception124,181
Car vacuum cleaner,
connecting108
Car wash146
Care
exterior147
interior150
Care of upholstery150
Care of wool velour150
Cargo loading112
Caring for the vehicle
finish148
Catalytic converter117
CBC (Cornering Brake
Control)21,119
Cellular phone107,124
refer also to the separate
Owner's Manual
A-Z

Everything from A to Z
201n
IndexDataTechnologyRepairsCar careControlsOverview
Center (high-mount) brake
lamp163
Center 3-point-safety belt in
the rear109
Center armrest105
Central locking system34
button38
Changing a tire165
Changing a wheel165
Charge indicator lamp20
Check Control76
Child restraint
systems55,59,61
Child seat59
Child seat security61
Child-safety locks55
Cigarette lighter108
Clock76
refer also to the Radio or
Onboard Monitor Owner's
Manual
Cockpit16
Coin holder105
Combination switch69
Compression192
Computer77
Configure settings53
Consumption78
Consumption display75
Contents10
Coolant122,142,195
antifreeze122 Coolant temperature
gauge75
Cooling system195
Copyright4
Cornering Brake Control
(CBC)21,119
Cruise control72
Cruising range78
Cup holder105
Curb weight194
D
Dashboard16
Data
dimensions193
engine192
weights194
Daytime-driving lamp
switch88
DBC (Dynamic Brake
Control)119
Defrost position96,101
Defroster, rear
window94,102
Defrosting the
windows96,101
Digital clock76
Dimensions193
Dipstick139
Disc brakes120
Displacement192
Displays18 Distance warning79
Diversity Antenna181
Divided rear backrest109
Door key32
Door locks, care122
Doors
child-safety locks55
emergency operation34
unlocking and locking34
Draft-free
ventilation95,102
Driving hints117
Driving in winter122
Driving lamps88
DSC (Dynamic Stability
Control)22,80,180
Dynamic Brake Control
(DBC)119
Dynamic Stability Control
(DSC)22,80,180
E
Electric power windows44
Electrical accessories,
failure170
Electrical system196
Electronic vehicle
immobilizer33
Elements of operation16
Emergency operation,
doors34
Energy Control74 Engine compartment136
Engine coolant142,195
Engine data192
Engine oil
capacity195
consumption139
pressure20
quality140
specifications140
viscosity140
Engine oil level22
check139
Engine speed192
Engine, starting62
Exterior mirrors52
F
Failure messages76
Fault displays76
Fault, ABS119
Filler cap cover27
Filling capacities195
Filling the washer
reservoir195
First-aid kit26
Fittings, towing and
tow-starting174
Flashlight104
Flat tire125,165
Fog lamps89
Folding rear backrest109
Footbrake120

Everything from A to ZFootwell lamps89
bulb replacement164
Four-wheel drive182
Front fog lamps89
bulb replacement161
Frost protection,
radiator142
Fuel28
Fuel consumption78
Fuel consumption
display75
Fuel filler door
releasing following an
electrical malfunction172
Fuel gauge75
Fuel injection192
Fuel quality28
Fuel reserve indicator
lamp75
Fuel specifications28
Fuel tank capacity195
Fuel tank gauge75
Functional status187
Fuses170 G
Gasoline28
Gasoline gauge75
Glove compartment104 Glove compartment lamp,
bulb replacement164
Gross vehicle weight194
H
Handbrake64
Handsfree system107
Hazard warning flashers26
Hazard warning triangle26
Head restraints48
Headlamp covers,
care146,159
Headlamp flasher69,89
Headlamp washer
system138,195
Headlamp washers71
Headlamps88
Heated seats103
Heating, rapid96
Heavy loads112
Height193
HiFi system Ð harman
kardon104
High beams23,69,89
bulb replacement159
High Performance Synthetic
Oils140
High-mount brake lamp163
Hood release134 Horn17
Hubcap166
Hydraulic Brake assistant,
refer to DBC
I
Ice warning77
Icy roads77
Identification, tires128
Ignition key32
Ignition lock62
Imprint4
Indicator lamps20
Inflated pressure28,125
Inflation pressure
monitoring86,186
INSPECTION75
Instrument cluster18
Instrument panel18
Interaxle tire rotation127
Interface socket108
for Onboard
Diagnostics154
Interference
cellular phone124
Interior lamps36,89
bulb replacement163
remote control36
Interior motion sensor42 Interior rearview mirror52
automatic dimming
feature53,184
Interlock62
Intermittent wipe69
J
Jack165
Jump-starting173 K
Key Memory53
Keys32
with remote control32 L
Lamps and bulbs158
LAMPS ON warning88
Lashing eyes112
LATCH attachment of the
child seat59
Leather care150
Length193
License plate lamp, bulb
replacement163
Light switch88
Light-alloy wheels130
Lighter108
Load-securing devices112

Everything from A to Z
203n
IndexDataTechnologyRepairsCar careControlsOverview
Louvers92,98
Low beam headlamps88
Low beams, bulb
replacement159
Lug bolts166
Lug wrench165
Luggage compartment41
capacity194
floor mat41
floor panel41
remote control37
Luggage compartment
lamps, bulb
replacement164
Luggage compartment
lid39
emergency release39
securing separately39
Luggage compartment
lighting39
Luggage rack113
Lumbar support49 M
M+S tires129
Maintenance75,145
Malfunction displays76
Manual transmission65
Manually controlled
recirculated-air101
Memory50 MFL (Multifunction steering
wheel)24
Microfilter95,171
Mirror memory50
Mirrors52
Mobile phone124
Modifications,
technical6,153
Motion sensor, interior42
Multifunction steering wheel
(MFL)24
N
Neckrest48 O
OBD interface socket154
Obstruction protection44
Odometer74
Oil
capacity195
consumption139
dipstick139
quality140
specifications140
viscosity140
Oil additives139
Oil change intervals, see the
Service and Warranty
Information Booklet
Oil filter change195 Oil level
check139
indicator lamp20
Oil pressure, indicator
lamp20
OILSERVICE75
Onboard tool kit158
Opening and closing Ð from
the inside38
Opening and closing Ð from
the outside34
Outside temperature
display77
Owner service
procedures206
P
Paint blemishes147
Paint, care147
Paintwork, minor
repairs148
Paintwork, waxing148
Park Distance Control
(PDC)79
Parking brake64
Parking help79
Parking lamps89
Parking, winter123
PDC (Park Distance
Control)79
Performance192
Phone, mobile124 Pocket flashlight104
Pollen95,102
Power seat49
Power steering123
Power windows44
safety switch45
Pressure monitoring,
tires86,186
Pressure, tires28,125
R
Radiator195
Radio Data System
(RDS)181
Radio reception124,181
Radio, refer to the separate
Owner's Manual
Rain sensor69,185
RDC (Tire Pressure
Control)86,186
RDS (Radio Data
System)181
Reading lamps90
Rear backrest, folding109
Rear lamps161
Rear window
defroster71,94,102
Rearview mirror52
Recirculated air mode94
Reclining seat47
Refueling27
Remote control35

Everything from A to ZRemoving condensation
from the
windows96,101
Replacement key32
Reporting safety defects7
Restraint systems55,59
Reverse17,65
Roller blind, sun
protection103
Roof load capacity194
Roof-mounted luggage
rack113
Rubber parts122 S
Safety belt tensioner183
Safety belts54
height adjustment54
Safety defects, reporting7
Safety feature44
Safety lock buttons38
Safety terminal, battery169
Seat
mechanical47
power49
Seat adjustment47
Seat heating103
Seat memory50
Securing cargo112
Securing loads112 Selector lever, automatic
transmission66
Self-defrosting mirrors52
Self-diagnostics187
Service and Warranty
Information Booklet145
Service Interval
Display75,145
Shiftlock66
Side airbags55
Side impact Head Protection
System55
Side lamps88
bulb replacement160
Ski bag110
Skid control123
Sliding/tilt sunroof45
closing following an
electrical malfunction172
convenience operation34
Slippery roads122
Snow chains122,129,1
31
Socket108
for flashlights108
for power supplies108
for vacuum cleaner108
Space-saver spare tire165
Spare key32
Spare tire165
Spare wheel165
Spark plugs196 Speaker107
Speed control72
Speed display18
Speedometer18
Sports seat49
Sports steering wheel with
multfunction buttons25
Starting62
Starting assistance173
Starting
problems117,173
Starting the engine62
Steel wheels130
Steering123
Steering wheel lock62
Steering wheel,
adjusting51
Steptronic66
Stopping the vehicle63
Storage compartments105
Storing the vehicle152
Stroke192
Summer tires128
Sun blind103
Sun visors52
Switching off the engine63
Symbols4,169
Synthetic oils140
T
Tachometer74 Tail lamp assembly, bulb
replacement161
Tail lamps161
Tank capacity195
Technical data192
Technical
modifications6,153
Telephone hookup107
Telephone, refer to the
separate Owner's Manual
Temperature
adjustment100
Temperature display
outside temperature77
Temperature gauge
engine coolant75
Temperature
layering95,102
Thigh support area,
adjusting49
Third brake lamp163
Three-point-safety belt in the
rear109
Through-loading
system109
Tilt alarm36,43
remote control36
Tire changing165
Tire codes128
Tire condition125
Tire damage125

Owner service proceduresA
Activated-charcoal filter,
changing171
Adding brake fluid143
Adding engine coolant142
Adding engine oil139
Air pressure, checking28
Antifreeze142 B
Backup lamps, bulb
replacement161
Battery
add distilled water169
charging170
Brake fluid, adding143
Brake lamps, bulb
replacement161
Brakes, brake faults121 C
Changing a tire165
Changing a wheel165
Checking air pressure28
Checking engine oil
level139
Checking oil level139 D
Defrost setting96
Defrosting the
windows96,101 Difficult steering123
Doors, emergency
operation34
E
Electrical accessories,
failure170
Electrical malfunction
fuel filler door172
sliding/tilt sunroof172
Emergency operation
doors34
fuel filler door172
sliding/tilt sunroof172
Engine coolant, adding142
Engine oil
add139
check139
quality140
specifications140
viscosity140
Engine oil level,
checking139 F
First-aid kit26
Fittings, towing and
tow-starting174
Flat tire165
Footwell lamps, bulb
replacement164 Front fog lamps, bulb
replacement161
Fuses, replacing170
G
Glove compartment lamp,
bulb replacement164 H
Hazard warning flashers26
Hazard warning triangle26
Headlamp cover, care159
High beams, bulb
replacement159 I
Indicator lamps20
Inflated pressure28,125
Interior lamps, bulb
replacement163
Interior motion sensor,
switching off43 J
Jack165 L
License plate lamp, bulb
replacement163
Low beams, bulb
replacement159 Lug wrench165
Luggage compartment
lamps, bulb
replacement164
Luggage compartment lid,
emergency release39
M
Maintenance145
Microfilter, changing171
Motion sensor, switching
off43 O
Oil
quality140
specifications140
viscosity140
Onboard tool kit158 P
Pressure, tires28 R
Rear lamps161
Releasing the fuel filler door
following an electrical
malfunction172
Releasing the hood134
Removing condensation
from the
Owner service procedure