1999 BUICK CENTURY brake light

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6-29 Brake Wear
Your vehicle has front disc brakes and rear drum brakes.
Disc brake pads have built
-in wear indicators that make
a high
-pitched warning sound when the brake pads
are worn and new pads are needed. The sound may
come and go or be heard all the time your vehicle is
moving (except when you are pushing on the brake
pedal firmly).
CAUTION:
The brake wear warning sound means that soon
your brakes won't work well. That could lead to
an accident. When you hear the brake wear
warning sound, have your vehicle serviced.
NOTICE:
Continuing to drive with worn-out brake pads
could result in costly brake repair.
Some driving conditions or climates may cause a brake
squeal when the brakes are first applied or lightly
applied. This does not mean something is wrong with
your brakes.
Properly torqued wheel nuts are necessary to help
prevent brake pulsation. When tires are rotated, inspect
brake pads for wear and evenly torque wheel nuts in the
proper sequence to GM specifications.
Brake linings should always be replaced as complete
axle sets.
See ªBrake System Inspectionº in Section 7 of this
manual under Part C ªPeriodic Maintenance
Inspections.º
Brake Pedal Travel
See your dealer if the brake pedal does not return to
normal height, or if there is a rapid increase in pedal
travel. This could be a sign of brake trouble.
Brake Adjustment
Every time you apply the brakes, with or without the
vehicle moving, your brakes adjust for wear.

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Scheduled Maintenance
7-5
The services shown in this schedule up to 100,000 miles
(166 000 km) should be performed after 100,000 miles
(166 000 km) at the same intervals. The services shown
at 150,000 miles (240 000 km) should be performed at
the same interval after 150,000 miles (240 000 km).
See ªOwner Checks and Servicesº and ªPeriodic
Maintenance Inspectionsº following.
Footnotes

The U.S. Environmental Protection Agency or the
California Air Resources Board has determined that the
failure to perform this maintenance item will not nullify
the emission warranty or limit recall liability prior to the
completion of the vehicle's useful life. We, however,
urge that all recommended maintenance services be
performed at the indicated intervals and the maintenance
be recorded.* Your vehicle has an Engine Oil Life Monitor. This
monitor will show you when to change the engine oil
and filter
-- usually between 3,000 miles (5 000 km) and
7,500 miles (12 500 km) since your last oil change.
Under severe conditions, the indicator may come on
before 3,000 miles (5 000 km). Never drive your vehicle
more than 7,500 miles (12 500 km) or 12 months
without an oil and filter change.
The system won't detect dust in the oil. So if you drive
in a dusty area, be sure to change your oil and filter
every 3,000 miles (5 000 km) or sooner if the CHANGE
OIL SOON light comes on. Remember to reset the Oil
Life Monitor whenever the oil is changed. For more
information, see ªChange Oil Soon Lightº in the Index.
+ A good time to check your brakes is during tire
rotation. See ªBrake System Inspectionº under ªPeriodic
Maintenance Inspectionsº in Part C of this schedule.

9-
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9-1
Section 9 Index
A
dding Equipment to the Outside of Your Vehicle 6-3 . . . . .
Air Bag
How Does it Restrain 1
-24 . . . . . . . . . . . . . . . . . . . . . . . . . .
How it Works 1-22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Location 1-22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Readiness Light 1-21, 2-51 . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing 1-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System 1-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What Makes it Inflate 1-23 . . . . . . . . . . . . . . . . . . . . . . . . . .
What Will You See After it Inflates 1-24 . . . . . . . . . . . . . . .
When Should it Inflate 1-23 . . . . . . . . . . . . . . . . . . . . . . . . .
Air Conditioning 3-3, 3-6, 3-8 . . . . . . . . . . . . . . . . . . . . . . . .
Air Conditioning Refrigerants 6-65 . . . . . . . . . . . . . . . . . . . . .
Alarm, Instant 2-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alignment and Balance, Tire 6-48 . . . . . . . . . . . . . . . . . . . . . .
Aluminum Wheels, Cleaning 6-55 . . . . . . . . . . . . . . . . . . . . . .
AM-FM Stereo 3-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AM-FM Stereo with Cassette Tape and Compact
Disc Player with Automatic Tone Control 3-21 . . . . . . . . . .
AM-FM Stereo with Cassette Tape Player 3-14 . . . . . . . . . . .
AM-FM Stereo with Cassette Tape Player and
Automatic Tone Control 3-17 . . . . . . . . . . . . . . . . . . . . . . . .
Antenna
Backglass 3
-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diversity 3-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fixed Mast 3-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Antifreeze 6
-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Anti-Lock
Brake System Warning Light 2-53, 4-7 . . . . . . . . . . . . . . . .
Brakes 4-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using 4-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Anti-Theft, Radio 3-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appearance Care 6-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appearance Care Materials 6-57 . . . . . . . . . . . . . . . . . . . . . . .
Arbitration Program 8-3, 8-4 . . . . . . . . . . . . . . . . . . . . . . . . . .
Armrest, Front Storage 2-44 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Armrest, Rear Storage 2-44 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ashtrays 2-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Astroroof 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio Controls, Steering Wheel Touch Control 3-29 . . . . . . .
Audio Equipment, Adding 3-30 . . . . . . . . . . . . . . . . . . . . . . . .
Audio Systems 3-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio Systems, Tips 3-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auto-Down Window 2-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic
Headlamp Control 2
-39 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overdrive (
)2-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Door Locks 2-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transaxle Check 7-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transaxle Fluid 6-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transaxle Operation 2-20 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transaxle PARK (P) Mechanism Check 7-17 . . . . . . . . . . .

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9-2
Automatic Dimming/Heated Outside
Rearview Mirror 2-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auxiliary Power Connection 2-46 . . . . . . . . . . . . . . . . . . . . . .
Back-up Lamp Bulb Replacement 6-38 . . . . . . . . . . . . . . . . .
Battery 6-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jump Starting 5-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement, Remote Keyless Entry 2-12 . . . . . . . . . . . . . .
Rundown Protection 2-42 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warnings 5-3, 5-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BBB Auto Line 8-3, 8-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Better Business Bureau Mediation 8-3, 8-4 . . . . . . . . . . . . . . .
Blizzard 4-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake
Adjustment 6
-29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BTSI 2-21, 2-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 6-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Master Cylinder 6-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parking 2-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pedal Travel 6-29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing System Parts 6-30 . . . . . . . . . . . . . . . . . . . . . . . .
System Warning Light 2-52 . . . . . . . . . . . . . . . . . . . . . . . . .
Trailer 4-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transaxle Shift Interlock 2-21, 2-28 . . . . . . . . . . . . . . . . . .
Transaxle Shift Interlock (BTSI) Check 7-16 . . . . . . . . . . .
Wear 6-29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brakes, Anti-Lock 4-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Braking 4-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Braking in Emergencies 4-10 . . . . . . . . . . . . . . . . . . . . . . . . . . BTSI 2
-21, 2-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BTSI Check 7-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulb Replacement 6-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Canadian Roadside Assistance 8-6 . . . . . . . . . . . . . . . . . . . .
Capacities and Specifications 6-64 . . . . . . . . . . . . . . . . . . . . . .
Carbon Monoxide 2-14, 2-30, 4-27, 4-34 . . . . . . . . . . . . . . .
Cassette
Deck Service 7
-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tape Player 3-15, 3-19, 3-23 . . . . . . . . . . . . . . . . . . . . . . . .
Tape Player Care 3-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tape Player Errors 3-16, 3-20, 3-24 . . . . . . . . . . . . . . . . . .
Center High-Mounted Stoplamp Bulb Replacement 6-35 . . . .
Center Passenger Position 1-26 . . . . . . . . . . . . . . . . . . . . . . . .
Certification Label 4-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chains, Safety 4-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chains, Tire 6-49 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Change Oil Soon Light 2-62 . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing a Flat Tire 5-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charging System Light 2-52 . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking Your Restraint Systems 1-53 . . . . . . . . . . . . . . . . . .
Chemical Paint Spotting 6-56 . . . . . . . . . . . . . . . . . . . . . . . . . .
Child Restraints 1-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Securing in a Rear Outside Seat Position 1-43 . . . . . . . . . . .
Securing in the Center Rear Seat Position 1-45 . . . . . . . . . .
Securing in the Right Front Seat Position 1-47 . . . . . . . . . .
Top Strap 1-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Where to Put 1-41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cigarette Lighter 2-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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9-6
Instrument Panel 2-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning 6-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cluster 2-49 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse Block 6-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Instrument Panel Brightness Control 2-40 . . . . . . . . . . . . . . . .
Interior Lamps 2-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jack, Tire 5-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jump Starting 5-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Key Lock Cylinders Service 7-15 . . . . . . . . . . . . . . . . . . . . .
Key Reminder Warning 2-14 . . . . . . . . . . . . . . . . . . . . . . . . . .
Keys 2-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Labels
Certification 4-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Parts Identification 6-58 . . . . . . . . . . . . . . . . . . . . .
Tire-Loading Information 4-30 . . . . . . . . . . . . . . . . . . . . . .
Vehicle Identification Number 6-58 . . . . . . . . . . . . . . . . . . .
Lamps
Courtesy 2
-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dome 2-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interior 2-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reading, Rearview Mirror 2-42 . . . . . . . . . . . . . . . . . . . . . .
Leaving Your Vehicle 2-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Leaving Your Vehicle with the Engine Running 2-27 . . . . . . .
Lighter 2-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lights
Air Bag Readiness 1
-21, 2-51 . . . . . . . . . . . . . . . . . . . . . . .
Anti-Lock Brake System Warning 2-53, 4-7 . . . . . . . . . . . . Brake System Warning 2
-52 . . . . . . . . . . . . . . . . . . . . . . . . .
Change Oil Soon 2-62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charging System 2-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise 2-62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door/Trunk Ajar Warning 2-63 . . . . . . . . . . . . . . . . . . . . . .
Engine Coolant Temperature Light 2-55 . . . . . . . . . . . . . . .
Enhanced Traction System Active 2-54 . . . . . . . . . . . . . . . .
Enhanced Traction System Warning 2-53 . . . . . . . . . . . . . .
Interior 2-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Coolant Warning 2-56, 6-23 . . . . . . . . . . . . . . . . . . . .
Low Fuel 2-64 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Oil Level 2-61, 6-11 . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Tire 2-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Traction 2-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Washer Fluid Warning 2-35, 2-63 . . . . . . . . . . . . . . . .
Oil Warning 2-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Belt Reminder 1-5, 2-51 . . . . . . . . . . . . . . . . . . . . . .
Security 2-62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Engine Soon 2-58 . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Vehicle Soon 2-63 . . . . . . . . . . . . . . . . . . . . . . . . . .
Loading Your Vehicle 4-30 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Locks
Cylinders 7
-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Delayed Locking 2-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door 2-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition Transaxle Lock Check 7-17 . . . . . . . . . . . . . . . . . .
Key Lock Cylinder Service 7-15 . . . . . . . . . . . . . . . . . . . . .
Lockout Protection Feature 2-7 . . . . . . . . . . . . . . . . . . . . . .
Manual Door 2-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Door 2-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programmable Automatic Power Door 2-5 . . . . . . . . . . . . .