2007 GMC SIERRA CLASSIC warning

Brake Wear
Your vehicle has front disc brakes and may have
rear drum brakes or rear disc 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 rmly.
{CAUTION:
The brake wear warning sound means that
soon your brakes will not 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 rst 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 tighten
wheel nuts in the proper sequence to GM torque
specications.
If you have rear drum brakes, they do not have
wear indicators, but if you ever hear a rear brake
rubbing noise, have the rear brake linings
inspected immediately. Rear brake drums should
be removed and inspected each time the tires
are removed for rotation or changing. Drum brakes
have an inspection hole to inspect lining wear
during scheduled maintenance. When you have
the front brake pads replaced, have the rear
brakes inspected, too.
Brake linings should always be replaced as
complete axle sets.
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 make a brake stop, your brakes
adjust for wear.
519

Replacing Brake System Parts
The braking system on a vehicle is complex. Its
many parts have to be of top quality and work
well together if the vehicle is to have really good
braking. Your vehicle was designed and tested with
top-quality GM brake parts. When you replace parts
of your braking system — for example, when your
brake linings wear down and you need new ones
put in — be sure you get new approved GM
replacement parts. If you do not, your brakes may
no longer work properly. For example, if someone
puts in brake linings that are wrong for your vehicle,
the balance between your front and rear brakes can
change — for the worse. The braking performance
you have come to expect can change in many other
ways if someone puts in the wrong replacement
brake parts.
Battery
Your vehicle has a maintenance free battery.
When it is time for a new battery, get one that has
the replacement number shown on the original
battery’s label. We recommend an ACDelco
®
replacement battery. SeeEngine Compartment
Overview on page 480for battery location.Warning:Battery posts, terminals, and related
accessories contain lead and lead compounds,
chemicals known to the State of California
to cause cancer and reproductive harm. Wash
hands after handling.
Vehicle Storage
If you are not going to drive your vehicle for
25 days or more, remove the black, negative (−)
cable from the battery. This will help keep
your battery from running down.
{CAUTION:
Batteries have acid that can burn you and
gas that can explode. You can be badly
hurt if you are not careful. SeeJump
Starting on page 521for tips on working
around a battery without getting hurt.
520

Uniform Tire Quality Grading
Quality grades can be found where applicable on
the tire sidewall between tread shoulder and
maximum section width. For example:
Treadwear 200 Traction AA Temperature A
The following information relates to the system
developed by the United States National Highway
Traffic Safety Administration (NHTSA), which
grades tires by treadwear, traction, and
temperature performance. This applies only to
vehicles sold in the United States. The grades are
molded on the sidewalls of most passenger car
tires. The Uniform Tire Quality Grading (UTQG)
system does not apply to deep tread, winter-type
snow tires, space-saver, or temporary use
spare tires, tires with nominal rim diameters of
10 to 12 inches (25 to 30 cm), or to some
limited-production tires.
While the tires available on General Motors
passenger cars and light trucks may vary with
respect to these grades, they must also conform
to federal safety requirements and additional
General Motors Tire Performance Criteria (TPC)
standards.
Treadwear
The treadwear grade is a comparative rating based
on the wear rate of the tire when tested under
controlled conditions on a specied government
test course. For example, a tire graded 150 would
wear one and a half (1.5) times as well on the
government course as a tire graded 100. The
relative performance of tires depends upon the
actual conditions of their use, however, and may
depart signicantly from the norm due to variations
in driving habits, service practices, and differences
in road characteristics and climate.
Traction – AA, A, B, C
The traction grades, from highest to lowest, are
AA, A, B, and C. Those grades represent the tire’s
ability to stop on wet pavement as measured under
controlled conditions on specied government test
surfaces of asphalt and concrete. A tire marked C
may have poor traction performance.
Warning:The traction grade assigned to this
tire is based on straight-ahead braking traction
tests, and does not include acceleration, cornering,
hydroplaning, or peak traction characteristics.
559

Temperature – A, B, C
The temperature grades are A (the highest), B,
and C, representing the tire’s resistance to the
generation of heat and its ability to dissipate heat
when tested under controlled conditions on a
specied indoor laboratory test wheel. Sustained
high temperature can cause the material of the tire
to degenerate and reduce tire life, and excessive
temperature can lead to sudden tire failure. The
grade C corresponds to a level of performance
which all passenger car tires must meet under the
Federal Motor Vehicle Safety Standard No. 109.
Grades B and A represent higher levels of
performance on the laboratory test wheel than
the minimum required by law.
Warning:The temperature grade for this tire is
established for a tire that is properly inated
and not overloaded. Excessive speed,
underination, or excessive loading, either
separately or in combination, can cause heat
buildup and possible tire failure.
Wheel Alignment and Tire Balance
The tires and wheels on your vehicle were aligned
and balanced carefully at the factory to give you
the longest tire life and best overall performance.
Adjustments to wheel alignment and tire
balancing will not be necessary on a regular basis.
However, if you notice unusual tire wear or your
vehicle pulling to one side or the other, the
alignment may need to be checked. If you notice
your vehicle vibrating when driving on a smooth
road, your tires and wheels may need to be
rebalanced. See your dealer for proper diagnosis.
Wheel Replacement
Replace any wheel that is bent, cracked, or badly
rusted or corroded. If wheel nuts keep coming
loose, the wheel, wheel bolts and wheel nuts
should be replaced. If the wheel leaks air, replace
it (except some aluminum wheels, which can
sometimes be repaired). See your dealer if any of
these conditions exist.
Your dealer will know the kind of wheel you need.
560

A rear blowout, particularly on a curve, acts much
like a skid and may require the same correction
you would use in a skid. In any rear blowout
remove your foot from the accelerator pedal. Get
the vehicle under control by steering the way
you want the vehicle to go. It may be very bumpy
and noisy, but you can still steer. Gently brake
to a stop, well off the road if possible.
{CAUTION:
Lifting a vehicle and getting under it to
do maintenance or repairs is dangerous
without the appropriate safety equipment
and training. The jack provided with your
vehicle is designed only for changing a
at tire. If it is used for anything else, you
or others could be badly injured or killed
if the vehicle slips off the jack. Use the
jack provided with your vehicle only for
changing a at tire.
If a tire goes at, the next part shows how to
use the jacking equipment to change a at
tire safely.
Changing a Flat Tire
If a tire goes at, avoid further tire and wheel
damage by driving slowly to a level place. Turn on
your hazard warning ashers. SeeHazard Warning
Flashers on page 212for more information.
{CAUTION:
Changing a tire can be dangerous. The
vehicle can slip off the jack and roll over
or fall on you or other people. You and
they could be badly injured or even killed.
Find a level place to change your tire. To
help prevent the vehicle from moving:
1. Set the parking brake rmly.
2. Put an automatic transmission shift
lever in PARK (P), or shift a manual
transmission to FIRST (1) or
REVERSE (R).
CAUTION: (Continued)
564

A
Accessories and Modications..................... 468
Accessory Power Outlet(s).......................... 228
Adding a Snow Plow or Similar
Equipment................................................ 416
Adding Equipment to Your Airbag-Equipped
Vehicle..................................................... 109
Additives, Fuel............................................ 472
Add-On Electrical Equipment....................... 599
Air Cleaner/Filter, Engine............................. 491
Air Conditioning.........................230, 231, 235
Airbag
Off Light.................................................. 248
Passenger Status Indicator....................... 250
Readiness Light....................................... 247
Airbag Sensing and Diagnostic
Module (SDM).......................................... 650
Airbag System............................................... 91
Adding Equipment to Your
Airbag-Equipped Vehicle....................... 109
Airbag Off Switch..................................... 100
How Does an Airbag Restrain?.................. 98
Passenger Sensing System...................... 103
Servicing Your Airbag-Equipped Vehicle.... 108
What Makes an Airbag Inate?.................. 97Airbag System (cont.)
What Will You See After an Airbag
Inates?................................................. 98
When Should an Airbag Inate?................. 95
Where Are the Airbags?............................. 93
AM-FM Radio.............................................. 291
Antenna, Fixed Mast................................... 353
Antenna, XM™ Satellite Radio
Antenna System....................................... 353
Anti-Lock Brake System (ABS).................... 361
Anti-Lock Brake, System Warning Light....... 255
Appearance Care
Aluminum or Chrome-Plated Wheels........ 594
Care of Safety Belts................................ 592
Chemical Paint Spotting........................... 596
Cleaning Exterior Lamps/Lenses.............. 593
Cleaning the Inside of Your Vehicle.......... 589
Fabric/Carpet........................................... 590
Finish Care.............................................. 593
Finish Damage......................................... 596
Instrument Panel, Vinyl, and Other
Plastic Surfaces.................................... 591
Leather.................................................... 591
Sheet Metal Damage............................... 595
Tires........................................................ 595
Underbody Maintenance........................... 596
Vehicle Care/Appearance Materials.......... 597
659

Appearance Care (cont.)
Washing Your Vehicle.............................. 592
Weatherstrips........................................... 592
Windshield and Wiper Blades................... 594
Ashtray(s).................................................... 229
Audio System(s).......................................... 289
AM-FM Radio.......................................... 291
Audio Steering Wheel Controls................. 349
Care of Your Cassette Tape Player.......... 350
Care of Your CD and DVD Player............ 352
Care of Your CDs and DVDs................... 352
Chime Level Adjustment........................... 353
Fixed Mast Antenna................................. 353
Radio with Cassette and CD.................... 304
Radio with CD......................................... 294
Radio with Six-Disc CD............................ 318
Rear Seat Audio (RSA)............................ 347
Setting the Time for Radios with
Radio Data Systems (RDS).................. 291
Setting the Time for Radios without
Radio Data Systems (RDS).................. 290
Theft-Deterrent Feature............................ 348
Understanding Radio Reception............... 350
XM™ Satellite Radio Antenna System...... 353
Automatic Headlamp System....................... 223Automatic Transmission
Fluid...............................................494, 497
Operation................................................. 140
Auxiliary Roof Mounted Lamp Switch.......... 226
B
Battery........................................................ 520
Battery Warning Light.................................. 253
Before Leaving on a Long Trip.................... 398
Brake
Anti-Lock Brake System (ABS)................. 361
Emergencies............................................ 363
Parking.................................................... 169
System Warning Light.............................. 254
Brakes........................................................ 517
Braking....................................................... 360
Braking in Emergencies............................... 363
Break-In, New Vehicle................................. 134
Bulb Replacement....................................... 532
Center High-Mounted Stoplamp (CHMSL)
and Cargo Lamp.................................. 537
Front Turn Signal, Sidemarker and
Daytime Running Lamps....................... 534
Halogen Bulbs......................................... 532
660

Bulb Replacement (cont.)
Headlamps............................................... 533
License Plate Lamps................................ 541
Pickup Box Identication and Fender
Marker Lamps...................................... 538
Replacement Bulbs.................................. 541
Roof Marker Lamps................................. 535
Taillamps, Turn Signal, Stoplamps
and Back-up Lamps.............................. 539
Buying New Tires........................................ 556
C
Calibration..........................................176, 180
California Fuel............................................. 471
California Proposition 65 Warning................ 469
Canadian Owners........................................... 3
Capacities and Specications...................... 609
Carbon Monoxide..............127, 174, 402, 429
Care of
Safety Belts............................................. 592
Your Cassette Tape Player....................... 350
Your CD and DVD Player........................ 352
Your CDs and DVDs................................ 352
Cargo Lamp................................................ 228
Center Console Storage Area...................... 202Center Front Passenger Position,
Safety Belts............................................... 37
Center High-Mounted Stoplamp
(CHMSL) and Cargo Lamp...................... 537
Chains, Tire................................................. 562
Check
Engine Light............................................ 258
Checking Things Under the Hood ................ 478
Chemical Paint Spotting .............................. 596
Child Restraints
Child Restraint Systems............................. 51
Infants and Young Children........................ 47
Lower Anchors and Tethers
for Children............................................ 58
Older Children........................................... 44
Securing a Child Restraint in a
Rear Seat Position................................. 71
Securing a Child Restraint in the
Center Front Seat Position..................... 74
Securing a Child Restraint in the Right
Front Seat Position (Crew Cab).............. 74
Securing a Child Restraint in the Right
Front Seat Position (Regular and
Extended Cab)................................ 78, 85
Where to Put the Restraint........................ 55
Chime Level Adjustment .............................. 353
661