brake GMC SIERRA 2004 Manual PDF

Preset Mode:PTO speed control mode is used for
stationary applications. (PTO will remain engaged while
mobile in the preset mode, however PTO set and
resume speed controls will be inoperative). This mode
provides a default standby speed of 800 or 850 rpm
(depending on the engine/transmission combination) and
two default PTO control speeds which follow:
1. PTO Set Speed of 1,250 rpm, or
2. PTO Resume Speed of 1,700 rpm.
Please note that the standby speed (800/850 rpm) is
not to be used as a PTO control speed. Vehicles
not equipped with cruise control will not have the resume
speed capability.
To use PTO speed control in variable mode (while
mobile) do the following:
1. Engage the PTO.
2. Vehicle speed must be greater than 5 mph.
3. Make sure your foot is off the brake pedal (and off
the clutch for vehicles equipped with a manual
transmission).
4. Select the desired engine speed by using the foot
pedal, and select SET on the PTO switch or the
cruise control.To use PTO speed control in variable mode (while
stationary) do the following:
1. Engage the PTO.
2. Vehicle speed must be less than 5 mph.
3. Make sure your foot is off the brake pedal (and off
the clutch for vehicles equipped with a manual
transmission).
4. Select the desired engine speed by using the foot
pedal, and select SET on the PTO switch or the
cruise control.
Variable Mode:PTO speed control mode can be used
for both stationary and mobile applications. This
mode allows PTO to be controlled in a fashion similar to
how cruise control sets vehicle speed. The operator
can set to an rpm (between 800 and 2,200) with
the cruise control feature or with the SET position on
the PTO switch. The operator is then able to increase
rpm in increments of 100, or²tap up²with the resume
position on the cruise control. Or, the operator can
decrease rpm in increments of 100 with the SET switch
on the PTO or the cruise control.Vehicles not
equipped with cruise control will not have the ªtap
upº capability..
4-102

Service............................................................5-3
Doing Your Own Service Work.........................5-3
Adding Equipment to the Outside of Your
Vehicle......................................................5-4
Fuel................................................................5-4
Gasoline Octane............................................5-4
Gasoline Speci®cations....................................5-5
California Fuel...............................................5-5
Additives.......................................................5-6
Fuels in Foreign Countries...............................5-6
Filling Your Tank............................................5-7
Filling a Portable Fuel Container.......................5-9
Checking Things Under the Hood....................5-10
Hood Release..............................................5-10
Engine Compartment Overview.......................5-12
Engine Oil...................................................5-18
Engine Air Cleaner/Filter................................5-23
Automatic Transmission Fluid (Except Allison
Transmission
ž) ..........................................5-25
Automatic Transmission Fluid (Allison
Transmission
ž) ..........................................5-28
Manual Transmission Fluid.............................5-31
Hydraulic Clutch...........................................5-32
Engine Coolant.............................................5-33
Coolant Surge Tank Pressure Cap..................5-36
Engine Overheating.......................................5-36Cooling System............................................5-39
Engine Fan Noise.........................................5-44
Power Steering Fluid.....................................5-45
Windshield Washer Fluid................................5-46
Brakes........................................................5-48
Battery........................................................5-52
Jump Starting...............................................5-53
Rear Axle.......................................................5-59
Four-Wheel Drive............................................5-60
Noise Control System.....................................5-62
Tampering with Noise Control System
Prohibited.................................................5-62
Bulb Replacement..........................................5-64
Halogen Bulbs..............................................5-64
Headlamps..................................................5-64
Front Turn Signal, Sidemarker and Daytime
Running Lamps.........................................5-66
Roof Marker Lamps......................................5-67
Center High-Mounted Stoplamp (CHMSL) and
Cargo Lamp.............................................5-69
Pickup Box Identi®cation and Fender Marker
Lamps.....................................................5-70
Taillamps.....................................................5-71
Replacement Bulbs.......................................5-74
Section 5 Service and Appearance Care
5-1

Checking Things Under
the Hood
{CAUTION:
Things that burn can get on hot engine parts
and start a ®re. These include liquids like fuel,
oil, coolant, brake ¯uid, windshield washer and
other ¯uids, and plastic or rubber. You or
others could be burned. Be careful not to drop
or spill things that will burn onto a hot engine.
Hood Release
To open the hood do the following:
1. Pull the handle inside
the vehicle located
under and to the left of
the steering wheel.
5-10

A. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 5-23.
B. Coolant Surge Tank. See
Engine Coolant on
page 5-33.
C. Air Filter Restriction Indicator (If Equipped). See
Engine Air Cleaner/Filter on page 5-23.
D. Engine Oil Dipstick. See
Engine Oil on page 5-18.
E. Automatic Transmission Dipstick (If equipped).
See
Automatic Transmission Fluid (Except Allison
Transmissionž) on page 5-25orAutomatic
Transmission Fluid (Allison Transmissionž)on
page 5-28.
F. Fan. See
Cooling System on page 5-39.
G. Engine Oil Fill. See
Engine Oil on page 5-18.H. Power Steering Fluid Reservoir. See
Power Steering
Fluid on page 5-45.
I. Remote Negative (-) Terminal (GND). See
Jump
Starting on page 5-53.
J. Remote Positive (+) Terminal. See
Jump Starting on
page 5-53.
K. Brake Fluid Reservoir. See
Brakes on page 5-48.
L. Clutch Fluid Reservoir (If Equipped). See
Hydraulic
Clutch on page 5-32.
M. Underhood Fuse Block. See
Fuses and Circuit
Breakers on page 5-126.
N. Battery. See
Battery on page 5-52.
O. Windshield Washer Fluid Reservoir. See
Windshield
Washer Fluid on page 5-46.
5-13

A. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 5-23.
B. Coolant Surge Tank. See
Engine Coolant on
page 5-33.
C. Air Filter Restriction Indicator (If Equipped). See
Engine Air Cleaner/Filter on page 5-23.
D. Engine Oil Dipstick. See
Engine Oil on page 5-18.
E. Automatic Transmission Dipstick (If Equipped).
See
Automatic Transmission Fluid (Except Allison
Transmissionž) on page 5-25orAutomatic
Transmission Fluid (Allison Transmissionž)on
page 5-28.
F. Engine Oil Fill. See
Engine Oil on page 5-18.
G. Fan. See
Cooling System on page 5-39.H. Remote Negative (-) Terminal (GND). See
Jump
Starting on page 5-53.
I. Power Steering Fluid Reservoir. See
Power Steering
Fluid on page 5-45.
J. Remote Positive (+) Terminal. See
Jump Starting on
page 5-53.
K. Brake Fluid Reservoir. See
Brakes on page 5-48.
L. Clutch Fluid Reservoir (If Equipped). See
Hydraulic
Clutch on page 5-32.
M. Underhood Fuse Block. See
Fuses and Circuit
Breakers on page 5-126.
N. Battery. See
Battery on page 5-52.
O. Windshield Washer Fluid Reservoir. See
Windshield
Washer Fluid on page 5-46.
5-15

A. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 5-23.
B. Coolant Surge Tank. See
Engine Coolant on
page 5-33.
C. Air Filter Restriction Indicator (If Equipped). See
Engine Air Cleaner/Filter on page 5-23.
D. Engine Oil Dipstick. See
Engine Oil on page 5-18.
E. Automatic Transmission Dipstick (If Equipped).
See
Automatic Transmission Fluid (Except Allison
Transmissionž) on page 5-25orAutomatic
Transmission Fluid (Allison Transmissionž)on
page 5-28.
F. Engine Oil Fill. See
Engine Oil on page 5-18.
G. Fan. See
Cooling System on page 5-39.H. Remote Negative (-) Terminal (GND). See
Jump
Starting on page 5-53.
I. Remote Positive (+) Terminal. See
Jump Starting on
page 5-53.
J. Power Steering Fluid Reservoir. See
Power Steering
Fluid on page 5-45.
K. Brake Fluid Reservoir. See
Brakes on page 5-48.
L. Clutch Fluid Reservoir (If Equipped). See
Hydraulic
Clutch on page 5-32.
M. Underhood Fuse Block. See
Fuses and Circuit
Breakers on page 5-126.
N. Battery. See
Battery on page 5-52.
O. Windshield Washer Fluid Reservoir. See
Windshield
Washer Fluid on page 5-46.
5-17

Get the vehicle warmed up by driving about 15 miles
(24 km) when outside temperatures are above 50ÉF
(10ÉC). If it's colder than 50ÉF (10ÉC), drive the vehicle
in THIRD (3) until the engine temperature gage
moves and then remains steady for 10 minutes.
A cold ¯uid check can be made after the vehicle has
been sitting for eight hours or more with the engine off,
but this is used only as a reference. Let the engine
run at idle for ®ve minutes if outside temperatures are
50ÉF (10ÉC) or more. If it's colder than 50ÉF (10ÉC), you
may have to idle the engine longer. Should the ¯uid
level be low during this cold check, you
mustcheck the
¯uid hot before adding ¯uid. Checking the ¯uid hot
will give you a more accurate reading of the ¯uid level.
Checking the Fluid Level
Prepare your vehicle as follows:
·Park your vehicle on a level place. Keep the engine
running.
·With the parking brake applied, place the shift lever
in PARK (P).
·With your foot on the brake pedal, move the shift
lever through each gear range, pausing for about
three seconds in each range. Then, position the shift
lever in PARK (P).
·Let the engine run at idle for three minutes or more.
Then, without shutting off the engine, follow these
steps:
The transmission dipstick
handle with the graphic is
located at the rear of
the engine compartment,
on the passenger's side.
5-26

Checking the Fluid Level
Prepare your vehicle as follows:
·Park your vehicle on a level place. Keep the engine
running.
·With the parking brake applied, place the shift lever
in PARK (P).
·With your foot on the brake pedal, run the engine
for at least once minute and shift to DRIVE (D).
Then shift to NEUTRAL (N) and then REVERSE (R)
to ®ll the hydraulic system. Then, position the
shift lever in PARK (P).
·Allow the engine to run at idle (500±800 rpm).
Slowly release the brake pedal.
Then, without shutting off the engine, follow these steps:
Cold Check Procedure
The purpose of the cold check is to determine if the
transmission has enough ¯uid to be operated safely until
a hot check can be made. The ¯uid level rises as ¯uid
temperature increases. DO NOT ®ll above the COLD
CHECK band if the transmission ¯uid is below normal
operating temperatures.
1. Pull out the dipstick and wipe it with a clean rag or
paper towel.
2. Push it back in all the way, wait three seconds and
then pull it back out again.3. Check the ¯uid level reading. Repeat the check
procedure to verify the reading.
4. If the ¯uid level is within the COLD CHECK band,
the transmission may be operated until the ¯uid is
hot enough to perform a hot check. If the ¯uid
level is not within the COLD CHECK band, add or
drain ¯uid as necessary to bring the level into
the middle of the COLD CHECK band.
5. Perform a hot check at the ®rst opportunity after the
normal operating temperature of 160ÉF (71ÉC) to
200ÉF (93ÉC) is reached.
6. If the ¯uid level is in the acceptable range, push the
dipstick back in all the way.
Hot Check Procedure
The ¯uid must be hot to ensure an accurate check. The
¯uid level rises as temperature increases.
1. Operate the transmission in DRIVE (D) range until
the normal operating temperature of 160ÉF (71ÉC)
to 200ÉF (93ÉC) is reached.
2. Pull out the dipstick and wipe it with a clean rag or
paper towel.
3. Push it back in all the way, wait three seconds and
then pull it back out again. Repeat the check
procedure to verify the reading.
5-29

Brakes
Brake Fluid
Your brake master cylinder reservoir is ®lled with DOT-3
brake ¯uid. SeeEngine Compartment Overview on
page 5-12for the location of the reservoir.
There are only two reasons why the brake ¯uid level in
the reservoir might go down. The ®rst is that the
brake ¯uid goes down to an acceptable level during
normal brake lining wear. When new linings are put in,
the ¯uid level goes back up. The other reason is
that ¯uid is leaking out of the brake system. If it is, you
should have your brake system ®xed, since a leak
means that sooner or later your brakes will not work
well, or will not work at all.
So, it is not a good idea to ªtop offº your brake ¯uid.
Adding brake ¯uid will not correct a leak. If you add ¯uid
when your linings are worn, then you will have too
much ¯uid when you get new brake linings. You should
add (or remove) brake ¯uid, as necessary, only when
work is done on the brake hydraulic system.
{CAUTION:
If you have too much brake ¯uid, it can spill on
the engine. The ¯uid will burn if the engine is
hot enough. You or others could be burned,
and your vehicle could be damaged. Add brake
¯uid only when work is done on the brake
hydraulic system. See ªChecking Brake Fluidº
in this section.
Refer to the Maintenance Schedule to determine when
to check your brake ¯uid. See
Scheduled Maintenance
on page 6-4.
5-48

Checking Brake Fluid
You can check the brake ¯uid without taking off the cap.Just look at the brake ¯uid reservoir. The ¯uid level
should be above MIN. If it is not, have your brake
system checked to see if there is a leak.
After work is done on the brake hydraulic system,
make sure the level is above the MIN but not over the
MAX mark.
5-49