1999 GMC C-SERIES ABS

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4-7
Avoid needless heavy braking. Some people drive in
spurts
-- heavy acceleration followed by heavy
braking
-- rather than keeping pace with traffic. This
is a mistake. Your brakes may not have time to cool
between hard stops. Your brakes will wear out much
faster if you do a lot of heavy braking. If you keep pace
with the traffic and allow realistic following distances,
you will eliminate a lot of unnecessary braking. That
means better braking and longer brake life.
If your engine ever stops while you're driving, brake
normally but don't pump your brakes. If you do, the
pedal may get harder to push down. If your engine
stops, you will still have some power brake assist. But
you will use it when you brake. Once the power assist is
used up, it may take longer to stop and the brake pedal
will be harder to push.
Hydraulic Brake Systems
If your engine stops running, or if your primary brake
system stops working, your vehicle has a reserve power
assist system to help you slow down. Just slowly and
steadily apply the brake pedal until you can safely get
off the road. The pedal will seem harder to push down.
Don't pump the pedal; the system won't work well or at
all that way.You may find that the steering wheel seems hard to turn
when you're turning and braking at the same time. Also,
the PRIMARY BRAKE warning light may come on and
the warning tone may sound. This is normal because the
main hydraulic brake system and power steering both
use the power steering pump. If this ever happens, let up
on the brake pedal a little. When you let up on the brake
pedal in that situation, it lets the steering get a little
more help from the pump.
Anti-Lock Brakes (Option)
Your vehicle may have anti-lock brakes (ABS). ABS is
an advanced electronic braking system that will help
prevent a braking skid.
If your vehicle has anti-lock
brakes, this warning light on
the instrument panel will
come on briefly when you
start your vehicle.
When you start your engine and begin to drive away,
your anti
-lock brake system will check itself. You may
hear a momentary motor or clicking noise while this test
is going on. This is normal.
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4-8
If there's a problem with the anti-lock brake system, the
anti
-lock brake system warning light will stay on. See
ªAnti
-Lock Brake System Warning Lightº in the Index.
Here's how anti-lock works. Let's say the road is wet.
You're driving safely. Suddenly an animal jumps out in
front of you.
You slam on the brakes. Here's what happens with ABS.A computer senses that wheels are slowing down. If one
of the wheels is about to stop rolling, the computer will
separately work the brakes at each wheel.
The anti
-lock system can change the brake pressure
faster than any driver could. The computer is
programmed to make the most of available tire and
road conditions.
You can steer around the obstacle while braking hard.
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6-66
GM Vehicle Care/Appearance Materials
PART NUMBERSIZEDESCRIPTIONUSAGE
99495423 in. x 25 in.Polishing Cloth ± Wax TreatedExterior polishing cloth
105017216 oz. (0.473 L)Tar and Road Oil RemoverRemoves tar, road oil and asphalt
105017316 oz. (0.473 L)Chrome Cleaner and PolishUse on chrome, stainless steel, nickel, copper and brass
105017416 oz. (0.473 L)White Sidewall Tire CleanerRemoves soil and black marks from whitewalls
105021432 oz. (0.946 L)Vinyl CleanerCleans vinyl tops, upholstery and convertible tops
105042723 oz. (0.680 L)Glass CleanerRemoves dirt, grime, smoke and fingerprints
1052918**8 oz. (0.237 L)Armor All
ProtectantProtects leather, wood, acrylics, Plexiglas
, plastic,
rubber and vinyl
105292516 oz. (0.473 L)Multi-Purpose Interior
CleanerCleans carpets, seats, interior trim, door panels
and floor mats
105292916 oz. (0.473 L)Wheel CleanerSpray on and rinse with water
10529308 oz. (0.237 L)Capture Dry Spot RemoverAttracts, absorbs and removes soils on fabric
123457212.5 sq. ft.Synthetic ChamoisShines vehicle without scratching
1234572512 oz. (0.354 L)Silicone Tire ShineSpray on tire shine
12377964*16 oz. (0.473 L)Finish EnhancerRemoves dust, fingerprints and surface contaminants
12377966*16 oz. (0.473 L)Cleaner WaxRemoves light scratches and oxidation and protects finish
12377984*16 oz. (0.473 L)Surface CleanerRemoves contaminants, blemishes and swirl marks
See your General Motors Parts Department for these products. * For exterior use only.
See ªRecommended Fluids and Lubricantsº in the Index. ** Not recommended for use on instrument panels.
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6-70
Name Circuits Protected
HYD BRK Brake Pump Motor Relay
HYD BRK Brake Alarm ModuleName Circuits Protected
B/U IGN3 Fuel Filter Relay, Blower Motor
Relays, ABS Power Relay,
Back
-Up Lamps, Auxiliary Wiring
Relay, IGN 3 Relay, Power
Window Relay, Vehicle Interface
Module, Transmission
Temperature Gage
STOP Stoplamps
WASH/WIPE Windshield Wipers/Washer,
Accessory Relay
DOME/PNL Dome Lamp, Radio Receiver,
Instrument Panel Lights,
A/C Controller,
Headlamp/Seatbelt Module
BLOWER Blower Motor
A/C A/C Clutch Compressor,
A/C Controller
TRN/HAZ Turn Signals, Hazard Flashers
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6-71
Name Circuits Protected
CHAS Exhaust Brake, Air Suspension
Dump Valve, Air Dryer, HYD
ABS ECHU
PARK LP Auxiliary Wiring, Air Conditioner
Controls, Parking Lamps, Turn
Signals, Taillamps, Stoplamps,
Marker Lamps, Trailer Running
Lamps, Lighted Mirrors, Radio
Receiver, Mirror Clearance Lamps
HORN Horn/Diagnostic Connector
PRK BRK Parking Brake Module
FUEL Heated Fuel Filter (Diesel
Engines) or Fuel Pump
(Gasoline Engines)
AXLE Heated Mirrors, Radiator Shutters,
Tw o
-Speed Axle Motor,
Tw o
-Speed Axle Switch
MRKR LP Roof Marker Lamps,
Trailer Marker Lamps,
Marker Lamp RelayName Circuits Protected
CIG/AUX Cigarette Lighter,
Auxiliary Power Jacks
AUX Auxiliary Wiring Relay
IGN RLY/VIN Vehicle Interface Module
(Diesel Engines) or Generator,
Coil, Injectors (Gasoline Engines)
WDO Power Windows
CRNK Starter Relay
IGN SW Instrument Panel Cluster Telltales
AUX Auxiliary Wiring
RDO Radio, Auxiliary Wiring
DR LK Power Door Locks
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6-72
Maxi-Fuse Block
When a circuit goes out, first check the instrument panel
circuit breaker block. If no circuit breakers are out there,
the problem could in the maxi
-fuse block.
This block uses blade
-type fuses. It's on the upper
passenger side of the engine compartment at the rear.
To access the maxi-fuse block, gently squeeze both
sides of the cover to unlatch the tabs at the top. Then,
unsnap both attachments at the bottom and remove
the cover.
Power is fed through these fuses to devices such as the
headlamp switch, ignition switch feed circuits and the
auxiliary brake pump (hydraulic brake vehicles).
Be sure to replace maxi
-fuses with maxi-fuses of the
same rating. Do not use maxi
-fuses of higher amperage
than those indicated on the maxi
-fuse block.
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6-73
Name Circuits/Circuit Breakers
Protected
STP/HAZ
TURNStop Lamp, Turn Signal/Hazard
Lights, Fuel, Ignition Relay
(Gasoline Engines)
IGN SW3 Air Conditioner, Ignition Switch,
Axle, ChassisName Circuits/Circuit Breakers
Protected
INT/EXT
LIGHTSParking Lamps,
Dome/Panel Lights
HEAD LAMP Headlamps,
Daytime Running Lamps
AUX WRG Auxiliary, Park Brake
IGN SW1 Ignition Switch, Wash/Wipe,
Crank, Radio
HYD PUMP Hydraulic Brake,
Brake Pump Motor
HYD ABS EHCU
PWR
WDO/LCKSWindow, Door Locks
PARK BRK Parking Brake Motor
BLOWER
HORNBlower, Horn, Cigarette
Lighter/Auxiliary
FUEL/ENGINE Empty
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