2009 GMC ACADIA brakes

Tire Size
The following illustration shows
an example of a typical
passenger vehicle tire size.
(A) Passenger (P-Metric) Tire
:The United States version of
a metric tire sizing system. The
letter P as the rst character in
the tire size means a passenger
vehicle tire engineered to
standards set by the U.S. Tire
and Rim Association.
(B) Tire Width
:The three-digit
number indicates the tire
section width in millimeters
from sidewall to sidewall.
(C) Aspect Ratio
:A two-digit
number that indicates the tire
height-to-width measurements.For example, if the tire size
aspect ratio is 60, as shown in
item C of the illustration, it would
mean that the tire’s sidewall is
60 percent as high as it is wide.
(D) Construction Code
:A letter
code is used to indicate the type
of ply construction in the tire.
The letter R means radial ply
construction; the letter D means
diagonal or bias ply construction;
and the letter B means
belted-bias ply construction.
(E) Rim Diameter
:Diameter of
the wheel in inches.
(F) Service Description
:These
characters represent the load
range and speed rating of the
tire. The load index represents
the load carry capacity a tire is
certied to carry. The load index
can range from 1 to 279. The
speed rating is the maximum
speed a tire is certied to carry
a load. Speed ratings range
fromAtoZ.
Tire Terminology and
Denitions
Air Pressure:The amount
of air inside the tire pressing
outward on each square inch
of the tire. Air pressure is
expressed in pounds per square
inch (psi) or kilopascal (kPa).
Accessory Weight
:This
means the combined weight
of optional accessories.
Some examples of optional
accessories are, automatic
transmission, power steering,
power brakes, power windows,
power seats, and air
conditioning.
Aspect Ratio
:The relationship
of a tire’s height to its width.
Belt
:A rubber coated layer of
cords that is located between
the plies and the tread.
Cords may be made from steel
or other reinforcing materials.
5-38 Service and Appearance Care

Additionally, if your vehicle has
electronic systems such as anti-lock
brakes, rollover airbags, traction
control, and electronic stability
control, the performance of these
systems can be affected.
{CAUTION
If you add different sized wheels,
your vehicle may not provide an
acceptable level of performance
and safety if tires not
recommended for those wheels
are selected. You may increase
the chance that you will crash and
suffer serious injury. Only use GM
specic wheel and tire systems
developed for your vehicle, and
have them properly installed by
a GM certied technician.
SeeBuying New Tires on page 5-49
andAccessories and Modifications
on page 5-3for additional
information.
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 nominalrim 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
Service and Appearance Care 5-51

Used Replacement Wheels
{CAUTION
Putting a used wheel on the
vehicle is dangerous. You cannot
know how it has been used or
how far it has been driven. It
could fail suddenly and cause a
crash. If you have to replace a
wheel, use a new GM original
equipment wheel.
Tire Chains
{CAUTION
Do not use tire chains. There is
not enough clearance. Tire chains
used on a vehicle without the
proper amount of clearance can
cause damage to the brakes,
suspension or other vehicle parts.
The area damaged by the tire
chains could cause you to lose
control of the vehicle and you or
others may be injured in a crash.
(Continued)
CAUTION (Continued)
Use another type of traction
device only if its manufacturer
recommends it for use on the
vehicle and tire size combination
and road conditions. Follow that
manufacturer’s instructions. To
help avoid damage to the vehicle,
drive slowly, readjust or remove
the device if it is contacting the
vehicle, and do not spin the
vehicle’s wheels. If you do nd
traction devices that will t, install
them on the front tires.
5-54 Service and Appearance Care

Service Publications
Ordering Information
Service Manuals
Service Manuals have the diagnosis
and repair information on engines,
transmission, axle suspension,
brakes, electrical, steering, body, etc.
Service Bulletins
Service Bulletins give additional
technical service information needed
to knowledgeably service General
Motors cars and trucks. Each bulletin
contains instructions to assist in the
diagnosis and service of your
vehicle.
Owner Information
Owner publications are written
specically for owners and intended
to provide basic operational
information about the vehicle.
The owner manual includes the
Maintenance Schedule for all
models.
In-Portfolio: Includes a Portfolio,
Owner Manual, and Warranty
Booklet.
RETAIL SELL PRICE:
$35.00 (U.S.) plus processing fee
Without Portfolio: Owner
Manual only.
RETAIL SELL PRICE:
$25.00 (U.S.) plus processing fee
Current and Past Model Order
Forms
Technical Service Bulletins and
Manuals are available for current
and past model GM vehicles.
To request an order form, specify
year and model name of the vehicle.ORDER TOLL FREE:
1-800-551-4123 Monday-Friday
8:00 AM - 6:00 PM Eastern Time
For Credit Card Orders Only
(VISA-MasterCard-Discover), visit
Helm, Inc. on the World Wide
Web at: helminc.com
Or you can write to:
Helm, Incorporated
P.O. Box 07130
Detroit, MI 48207
Prices are subject to change
without notice and without incurring
obligation. Allow ample time for
delivery.
Note to Canadian Customers: All
listed prices are quoted in U.S.
funds. Canadian residents are to
make checks payable in U.S. funds.
Customer Assistance Information 7-15

B
Battery...............................5-28
Electric Power
Management.................3-15
Run-Down Protection.........3-16
Bluetooth
®..........................3-99
Brake
Emergencies...................... 4-5
Brake Fluid.........................5-25
Brakes...............................5-25
System Warning Light.......3-38
Braking................................ 4-3
Braking in Emergencies.......... 4-5
Break-In, New Vehicle..........2-20
Bulb Replacement................5-33
Halogen Bulbs..................5-33
Headlamp Aiming..............5-33
License Plate Lamps.........5-34
Replacement Bulbs...........5-34
Buying New Tires.................5-49
C
Calibration..........................3-54
California Fuel....................... 5-5
California Perchlorate
Materials Requirements....... 5-3
California Proposition 65
Warning............................ 5-3
Canadian Owners..................... ii
Capacities and
Specications...................5-96
Carbon
Monoxide........2-11, 2-30, 4-13
Care of
Safety Belts.....................5-84
Cargo Cover.......................2-52
Cargo Management System . . . 2-52
Cargo Tie Downs.................2-52
CD, MP3 ....................3-89, 3-93
Center Console
Storage Area....................2-49Chains, Tire........................5-54
Charging System Light..........3-37
Check
Engine Lamp...................3-41
Checking Things Under
the Hood ........................... 5-9
Chemical Paint Spotting........5-88
Child Restraints
Child Restraint Systems.....1-34
Infants and Young
Children.......................1-31
Lower Anchors and Tethers
for Children..................1-37
Older Children..................1-29
Securing a Child Restraint
in a Rear Seat Position....1-43
Securing a Child Restraint
in the Right Front
Seat Position................1-45
Where to Put the
Restraint......................1-35
i-2 INDEX