2001 BMW 540I SEDAN coolant reservoir

146nBrake system Winter operation
Brake fluid level
The warning lamp for the brake
hydraulic system comes on, or
the "CHECK BRAKE FLUID"
message appears in the Check
Control.
The brake fluid level is too low in the
reservoir (refer to page 168).
If the brake fluid level is too low and
brake pedal travel has become notice-
ably longer, there may be a defect in
one of the brake system's hydraulic
circuits.
Proceed to the nearest BMW
center. Higher brake application
pressure may be necessary under these
conditions, and brake pedal travel may
be significantly longer. Please remem-
ber to adapt your driving style accord-
ingly. <
The warning lamp comes on together
with the "CHECK BRAKE PADS" mes-
sage in the Check Control.
Brake pads
The warning lamp for the brake
pads comes on, or the "CHECK
BRAKE LININGS" message
appears in the Check Control:
The brake pads have reached their
minimum pad thickness. Proceed to the
nearest BMW center as soon as possi-
ble to have the pads replaced.
For your own safety: use only
brake pads that BMW has
approved for your specific vehicle
model. BMW cannot evaluate non-
approved brake pads to determine if
they are suited for use, and therefore
cannot ensure the operating safety of
the vehicle if they are installed. <
The onset of winter is often accompa-
nied by rapid changes in weather.
Adaptations in driving style should be
accompanied by preparations on the
vehicle itself to ensure that your vehicle
operation through the winter remains
safe and trouble-free.
Coolant
Ensure that the coolant mixture con-
tains the year-round ratio of 50: 50 of
water and antifreeze/corrosion inhibitor.
This mixture provides protection
against freezing down to approx. -34 7
(-37 6). Replace the coolant every four
years.
Locks
BMW door lock deicer can be used to
free the locks if they are frozen. This
deicer also contains lubricant.
After using deicer, treatment with BMW
lock barrel grease is recommended.

Index
Data
Technology
Repairs
Car care
Controls
Overview
161n
1 Auxiliary terminal for jump starting 200
2 Reservoir for brake fluid (under the housing of the microfilter) 168
3 Engine oil dipstick 165
4 Coolant expansion tank 167
5 Engine oil filler neck 165
6 Reservoir for intensive-cleaning system
*164
7 Reservoir for windshield and headlamp washer system
*164
Engine compartment – BMW 525i, 530i

Index
Data
Technology
Repairs
Car care
Controls
Overview
163nEngine compartment – BMW 540i
1 Reservoir for brake fluid (under the
housing of the microfilter) 168
2 Auxiliary terminal for jump starting 200
3 Engine oil dipstick 165
4 Engine oil filler neck 165
5 Coolant expansion tank 167
6 Reservoir for intensive-cleaning system
*164
7 Reservoir for headlamp washer
* and
windshield washer system 164

168nCoolant Brake fluid
Adding coolant
Wait until the engine cools before
removing the cap from the expansion
tank. The needle of the coolant temper-
ature gauge in the instrument cluster
must be located in the blue zone; other-
wise, there is a danger of scalding.
1 Start by turning the cap counter-
clockwise. Pause to allow any
accumulated pressure to escape,
then open.
2 If the coolant is low, slowly add coolant until the correct level is
reached – do not overfill.
The coolant is a mixture of water and
extended-duty antifreeze with corrosion
inhibitor. Always maintain the pre-
scribed all-season 50:50 mixture ratio
for year-round protection against inter-
nal corrosion. No other additives are re-
quired.
Replace the coolant every four years.
If the indicator lamp for the
brake hydraulic system comes
on or if the "CHECK BRAKE
FLUID" warning appears in the
Check Control
*: the brake fluid
level is too low in the reservoir.
The brake fluid reservoir is located
under the microfilter housing on the
driver's side of the car. Should you de-
termine that the brake fluid is low, refer
the problem to your BMW center, who
can trace and rectify any sources of
leakage when refilling the reservoir.
Your BMW center is familiar with the
specifications for approved brake
fluids (DOT 4).
Brake fluid loss results in extended
pedal travel. For this situation, refer to
the notes on page 146.
Brake fluid is hygroscopic, that is,
it absorbs moisture from the air
over time.
In order to ensure the safety and
reliability of the brake system, have
the brake fluid changed every two years
by an BMW center. Refer also to the
Service and Warranty Information
Booklet (US models) or to the Warranty
and Service Guide Booklet (Canadian
models).
Brake fluid is toxic and damages the
vehicle's paint. You should always store
it in its original container and in a loca-
tion which is out of reach of children.
Do not spill the fluid and do not fill the
brake fluid reservoir beyond the "MAX"
mark. The brake fluid could ignite upon
contact with hot engine parts and
cause serious burns. <
Comply with the applicable
environmental laws regulating the
disposal of brake fluid. <

Everything from A to Z

Door locks, care146
Doors
emergency release38
manual operation38

t

remote control40
unlocking and locking38
DOT Quality Grades151
Drive belts224
Driving in winter146
Driving notes141
Driving through water141
DSC (Dynamic Stability
Control)24, 102, 208
DSP sound system211
refer also to the Radio
Owner's Manual
Dynamic Brake Control
(DBC)23, 100, 145
Dynamic Stability Control
(DSC)24, 102, 208

E
Electric power seat52
Electric power windows49
Electrical defect
fuel filler door198

t

sliding/tilt sunroof198

t

tailgate199
Electrical heating, exterior
mirror57
Electrical steering wheel,
adjusting56Electrical system224
Electronic vehicle
immobilizer37
Elements of operation16
Emergency operation
doors38

t

fuel filler door198

t

luggage compartment lid/
tailgate43, 199

t

sliding/tilt sunroof198

t

Energy control84
Engine
compartment160
coolant167
Engine oil
consumption165
grades166
level23
pressure22
specifications166

t

Engine specifications218
Error indicators86
Estimated time of arrival97
Exterior finish172
Exterior mirror56
electrical heating57
Exterior mirror with
automatic dimming
feature211

F
Failure messages86

t

Failure of an electrical
accessory196

t

Failure warnings86

t

Filler cap cover28
Filling capacities223
Filling the washer
reservoir164

t

First-aid kit27

t

Fittings, tow-starting and
towing201

t

Flashlight124
Flat tire150, 190

t

Fog lamp, bulb
replacement185

t

Footbrake144
Footwell lamps107
bulb replacement189

t

Forward/backward
adjustment, seats52, 55
Front fog lamps106
Front seat adjustment52
Frost protection,
radiator167
Fuel29
gauge84
quality29
tank capacity223
Fuel consumption97
average97
indicator84Fuel filler door, release after
electrical fault198
t
Fuses196

t

, 197

G
Gasoline29
gauge84
quality29
Glove compartment124
bulb replacement189
t

Gross vehicle weight221

H
Handbrake23, 70
Hands-free system125
Hazard warning
flashers27

t

Hazard warning
triangle27

t

Head restraints53
Headlamp covers,
care171

t

, 183

t

Headlamp flasher78
Headlamp washer
system164
Heated seats119
Heated steering wheel120
Heating and
ventilation108, 114
Heating while stopped118
Heating, rapid113
Heavy loads136