1993 CHEVROLET SUBURBAN service

Service & Appearance Care
Brake Master Cylinder
Your brake master cylinder is here. It is filled with DOT-3 brake fluid.
P
K2470
There are only two reasons why the brake fluid level in your master cylinder
might go down. The first is that the brake fluid goes down to an acceptable
level during normal brake lining wear. When new linings are put in, the fluid
level goes back up. The other reason is that fluid is leaking out of the brake
system.
If it is, you should have your brake system fixed, since a leak means
that sooner or later your brakes won’t work well, or won’\
t work at all.
So, it
isn’t a good idea to “top
off your brake fluid. Adding brake fluid won’t correct
a leak.
If you add fluid when your linings are worn, then you’ll have \
too
much fluid when you get new brake linings. You should add (or remove)
brake fluid, as necessary only when work is done on the brake hydraulic
system.
.
4 If you---have too much brake fluid, it can spill on the engine. The fluid
will burnhhe engine is hot enough. You or others could be burned,
and your vehicle could be damaged. Add brake fluid only when \
work
is done on the brake hydraulic system.
Refer to the Maintenance Schedule to determine when to check your brake
fluid. See “Periodic Maintenance” in the Index,
To Check Brake Fluid:
You can check the brake fluid without taking off the cap. Just look at the
windows on the brake fluid reservoir. The fluid levels should \
be above the
MIN
mark. If they aren’t, have your brake system checked to see if there is a leak.
6-32
ProCarManuals.com

Service & Appearance Care
Front Suspension and Steering Linkage
Your maintenance schedule will tell you how often to lubricate the fittings. See
“Recommended Fluids and Lubricants” in the Index for the \
proper lubricant to
use.
Front Wheel Bearings
Your vehicle has front wheel bearings that must be cleaned and repa\
cked.
Your maintenance schedule will
tell you how often this must be done.
Front Shock Absorbers
The front shock absorbers of your vehicle do many things. They help the
vehicle ride smoothly and also control the travel of the suspension system.
When the shock absorbers are serviced, any replacement shock ab\
sorbers must be the same as the original equipment shock absorbers in \
both
extended length and strength.
Wheel Nut Torque
For vehicles with dual wheels, when the vehicle, wheel or fast\
eners are new,
have the torque set at the first
100, 1,000 and 6,000 miles (160, 1600 and
9600 km). Use the torque specified in the appropriate Specification \
Chart later
in this section.
Single Belt Accessory Drive
If your new vehicle uses a serpentine belt, it is lighter, and more durable
than systems with several belts.
The belt runs over or around the pulleys on the engine.
A tensioner is used
to keep the belt tight at all times. The tensioner also makes replacing the
belt easier. If you need
to replace the belt, be sure to get the correct
replacement belt. Your dealership or parts supplier can help you with this.
The Accessory Drive Belt Routing label on your vehicle will sh\
ow you how to route the belt your vehicle uses.
6-34
ProCarManuals.com

Service & Appearance Care
Hood Laiches and Hood Hinge
Your maintenance schedule will tell you how often to lubricate the hood latch
and hood hinge assembly. See “Recommended Fluids and Lubrican\
ts” in the
Index for the proper lubricant to use.
Propeller Shaft Slip Splines
See your maintenance schedule to find out how often the slip \
splines must
be lubricated, See “Recommended Fluids and Lubricants” in the Index for the
proper lubricant to use.
Constant Velocity Joints
See your maintenance schedule to find out how often the consta\
nt velocity
joints must be lubricated. See “Recommended Fluids and Lubricants”\

in the
Index for the proper lubricant to use.
Body
Normal use of your vehicle will cause metal to metal wear at some points on
the cab and body
if they are not lubricated.
For exposed surfaces, such as door checks, door lock bolts, lo\
ck striker
plates, dovetail bumper wedges, etc., a thin film of engine oil should be
applied.
The seat adjusters and seat track should be lubricated with ch\
assis grease, Door weather strips and rubber hood bumpers should be lightly \
coated with a
rubber lubricant.
Never use too much of any lubricant and be sure to wipe up any extra
lubricant when you are finished.
Your maintenance schedule will tell you how often to lubricate these items.
See “Recommended Fluids and Lubricants” in the Index
for the proper
lubricant to use.
Lock Cylinders
To be sure your locks operate properly, they must be lubricated, Your
vehicle’s maintenance schedule will tell you how often
to lubricate them. See
“Recommended Fluids and Lubricants”
in the Index for the proper lubricant to
use.
You should not use penetrating oils because they could wash out the factory
installed lubricant and cause the lock to bind. De-icers which contain alcohol
could also wash away the lubricant,
so be sure to lubricate the lock after
using a de-icer
of this type.
6-36
ProCarManuals.com

P
Service & Appearance Care
Sealed Beam Headlights
-.
1. Remove the four screws from the headlight retainer.
2. Pull the headlight out and remove the retainer.
3. Unplug and remove old headlight.
4. Plug in the new headlight and put it in place.
5. Install the retainer to the headlight.
6. Install the screws.
Halogen Bulbs
Halogen bulbs have pressurized gas inside and can burst if you drop
or scratch the bulb.
You or others could be injured. Take special car€
when handling and disposing
of halogen bulbs.
CAUTION I
NOTICE I
Avoid touching the bulb or letting it come in contact with anything da.. .~-
Oil from your skin or moisture on the bulb can cause the bulb to explode
when
it is turned on. If either comes in contact with the bulb. clean it v
alcohol or suitable deareaser and wiDe the bulb dry.
6-38
ProCarManuals.com

Service & Appearance Care
Front Parkingflurn Signal Lights
K2681
1. Remove the screws and take out the parkinglturn signal light a\
ssembly,
2. Squeeze the tab on the side of the light socket while turning the socket
counterclockwise.
3. Pull out the socket.
4. Push in gently on the bulb, turn it counterclockwise and remove it from
the socket.
6-40
ProCarManuals.com

Service & Appearance Care
Windshield Wipers
The windshield wiper motor is protected by a circuit breaker and a fuse. If
the motor overheats due to heavy snow, etc., the wiper will stop until the
motor cools.
If the overload is caused by some electrical problem and not
snow, etc., be sure to get
it fixed,
Power Windows and Other Power Options
Circuit breakers in the fuse panel protect the power windows and other power
accessories. When the current load
is too heavy, the circuit breaker opens
and
closes, protecting the circuit until the problem is fixed or goes away.
Trailer Wiring Harness
The optional seven-wire trailer wiring harness is protected by an in-line fuse
in the battery feed wire. This fuse is near the junction
block. See “Trailer
Wiring Harness” in the Index for more information.
Fuse Block
m
, .. .
i
-+ lW -
-=
. . . . . . . . .
..
K2644
The fuse block is in
the instrument panel on the driver’s side.
You can remove fuses with a fuse extractor, if you have one. To remove
fuses
if you don’t have one, hold the end of the fuse between your thumb
and index finger and pull straight out.
Be sure to use the correct fuse.
If you ever have a problem on the road and
don’t have a spare fuse, you can “borrow” one of the correct value. Just pick
some feature of your vehicle that you can get along without-like the radio \
or
cigarette lighter-and use
its fuse, if it is of the value you need. Replace it
as
soon as you can. See “Fuses and Circuit Breakers” in the Index for more
information.
644
ProCarManuals.com

Exhaust System
To help prevent damage to your exhaust system, do not continue to drive
your vehicle
if you notice:
Engine misfiring
Loss of performance
Other unusual operating conditions
Have your engine and exhaust system serviced regularly.
Three- Way Catalytic Converter
Your vehicle’s three-way catalytic converter is designed to reduce the
pollutants in your vehicle’s exhaust. Use only unleaded fuel in your vehic\
le. If
you use leaded fuel, you could damage your three-way catalytic \
converter,
and other engine components.
Computer Command Control System
This system has an oxygen (OS) sensor that helps keep your engine’s
air-fuel mixture at a proper level. Use only unleaded fuel in your vehicle.
If
you use leaded fuel, you could damage your oxygen (OS) sensor and
three-way catalytic converter.
The Malfunction Indicator Lamp
(SERVICE ENGINE SOON) on your
instrument panel lets you know when your emission control syste\
m needs
service. The light will come on briefly when you start your e\
ngine to let you know that the system
is working. If it does not come on when you start your
engine, or
if it comes on and stays on while you’re driving your system may \
need service. Your vehicle should still be driveable, but you should have your
system serviced right away.
Secondary Air Injection (AIR) System
You may have this system. It lets you know if your engine control module,
wiring harness or solenoid need service.
If the Malfunction Indicator Lamp
(Service Englne Soon) comes on, you need service.
645
ProCarManuals.com

Service & Appearance Care
When you weigh your trailer, be sure to include the weight of everything you
put in it. And, remember to figure the weight of the people inside as part of
your load.
Your dealer can help you determine your
GCWR.
Add-on Equipment
When you carry removable items, like snow plow blades, you may\
need to
put a limit on how many people you carry inside your vehicle. Be sure to
weigh your vehicle before you buy and install the new equipment.
NOTICE 1
rims
We don’t make tires. Your new vehicle comes with high quality tires made by
a leading tire manufacturer. These tires are warranted by the tire
manufacturers and their warranties are delivered with every new \
vehicle.
If
your spare tire is a different brand than your road tires, you will have a tire
warranty folder from each of these manufacturers.
6-40
ProCarManuals.com