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Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1991 GMC C1500 Pickup car and truck
repair procedures including GMC engine diagrams, wiring diagrams, repair work estimating measures, technical service bulletins, auto body work
guidance, starter & alternator replacement procedures, serpentine belt replacement procedures, radiator & hose replacement procedures, tune-up &
drivability specifications, quick lube illustrations, preventive maintenance guide, engine light reset instructions, parts removal and install
procedures, fuel filter replacement directions, component location diagrams, air filter locations & replacement instructions, a/c
system specifications, and general auto service procedures. You don't have to be a car mechanic or technician to know how to fix
your 1991 GMC C1500 Pickup automobile. Try the Automotix DIY solution today!
We have info for following modifications of 1991 GMC C1500 Pickup
- 1991 GMC C1500 Pickup Sierra 4.3 V6 GAS, CID:262, Fuel Injection, Aspiration:262, Engine VIN:, Desg:Z
- 1991 GMC C1500 Pickup Sierra 6.2 V8 DIESEL, CID:379, Fuel Injection, Aspiration:379, Engine VIN:, Desg:C
- 1991 GMC C1500 Pickup Sierra 5.0 V8 GAS, CID:305, Fuel Injection, Aspiration:305, Engine VIN:, Desg:H
- 1991 GMC C1500 Pickup Sierra 5.7 V8 GAS, CID:350, Fuel Injection, Aspiration:350, Engine VIN:, Desg:K
- 1991 GMC C1500 Pickup Sierra XC 4.3 V6 GAS, CID:262, Fuel Injection, Aspiration:262, Engine VIN:, Desg:Z
- 1991 GMC C1500 Pickup Sierra XC 6.2 V8 DIESEL, CID:379, Fuel Injection, Aspiration:379, Engine VIN:, Desg:C
- 1991 GMC C1500 Pickup Sierra XC 5.0 V8 GAS, CID:305, Fuel Injection, Aspiration:305, Engine VIN:, Desg:H
- 1991 GMC C1500 Pickup Sierra XC 5.7 V8 GAS, CID:350, Fuel Injection, Aspiration:350, Engine VIN:, Desg:K
BRAKE SERVICE PROCEDURES FOR 1991 GMC C1500 Pickup AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC C1500 Pickup cars and light trucks from 1990+.
ANTI-LOCK BRAKES, GENERAL MOTORS -> Rear Wheel Anti-Lock Brake System -> DESCRIPTION
Vehicle: 1991 GMC C1500 Pickup Sierra XC 6.2 V8 DIESEL
The Rear Wheel Anti-Lock (RWAL) system, Fig. , reduces the occurrence of rear wheel lockup during severe braking by regulating rear hydraulic line pressure. Pressure applied to the rear wheel brakes is regulated by a control valve assembly located under the master cylinder. The control valve consists of a dump valve which releases hydraulic pressure into an accumulator, and an isolation valve which holds rear brake pressure. Operation of the dump valve and isolation valve is controlled by an Electronic Control Unit (ECU) which is mounted next to the master cylinder.
The ECU receives ...
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BRAKE SERVICE PROCEDURES FOR 1991 GMC C1500 Pickup AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC C1500 Pickup cars and light trucks from 1990+.
ANTI-LOCK BRAKES, GENERAL MOTORS -> Four Wheel Anti-Lock Brake System -> COMPONENT REPLACEMENT -> EHCU MODULE -> FRONT WHEEL SPEED SENSOR -> REAR WHEEL SPEED SENSOR
Vehicle: 1991 GMC C1500 Pickup Sierra 5.0 V8 GAS
EHCU MODULE
The EHCU module is not serviceable and must be replaced as a unit. Refer to Fig. when replacing the unit.
- Bleed brake booster by depressing brake pedal several times.
- Remove washer tank attaching bolts, then position aside.
- Remove EHCU electrical connectors.
- Disconnect module brake lines. Use caution not to get brake fluid on paint or electrical connections.
- Remove upper to lower bracket assembly attaching bolts.
- Remove EHCU module and upper bracket assembly from vehicle.
- Remove upper mounting bracket to EHCU module attaching bolts.
- Reverse procedure to install, noting...
CLICK HERE TO GET FULL ACCESS TO 1991 GMC C1500 Pickup BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 GMC C1500 Pickup AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC C1500 Pickup cars and light trucks from 1990+.
ANTI-LOCK BRAKES, GENERAL MOTORS -> Four Wheel Anti-Lock Brake System -> TROUBLESHOOTING
Vehicle: 1991 GMC C1500 Pickup Sierra 4.3 V6 GAS
Refer to Figs. throug...
CLICK HERE TO GET FULL ACCESS TO 1991 GMC C1500 Pickup BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 GMC C1500 Pickup AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC C1500 Pickup cars and light trucks from 1990+.
HYDRAULIC BRAKE SYSTEMS, GENERAL MOTORS -> COMPONENT DESCRIPTION -> HYDRAULIC CONTROL VALVES -> MASTER CYLINDER
Vehicle: 1991 GMC C1500 Pickup Sierra 6.2 V8 DIESEL
MASTER CYLINDER
Some vehicles use a conventional tandem master cylinder with two hydraulic pistons operating in line. The primary piston controls the front brake system and the secondary piston controls the rear brake system.
Other models use a master cylinder that operates the same as the conventional master cylinder, but also incorporates a quick take-up feature in the rear chamber to reduce excessive pedal travel which may result from increased fluid displacement required to move the low drag caliper piston out against the rotor.
The quick take-up uses a spring-loaded ball...
CLICK HERE TO GET FULL ACCESS TO 1991 GMC C1500 Pickup BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 GMC C1500 Pickup AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC C1500 Pickup cars and light trucks from 1990+.
DISC BRAKES, GENERAL MOTORS -> Bendix Single Piston Sliding Caliper -> DESCRIPTION
Vehicle: 1991 GMC C1500 Pickup Sierra XC 6.2 V8 DIESEL
The Bendix single piston sliding caliper disc brake is standard equipment on some truck applications, while on other trucks it is used only in Hydro-Boost power brake applications with both front disc brakes and 4 wheel disc brakes. On 4 wheel disc brakes, the front and rear systems are identical.
T...
CLICK HERE TO GET FULL ACCESS TO 1991 GMC C1500 Pickup BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 GMC C1500 Pickup AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC C1500 Pickup cars and light trucks from 1990+.
POWER BRAKE UNITS, GENERAL MOTORS -> Tracker Brake Booster -> POWER BRAKE UNIT, Replace
Vehicle: 1991 GMC C1500 Pickup Sierra 5.7 V8 GAS
Refer to Fig. , when replacing power brake unit.
- Disconnect battery ground cable.
- Remove master cylinder as follows:
- Remove air cleaner assembly, then the reservoir lead wire and pressure limit valve wire at electrical connectors.
- Remove fluid from reservoir using a syringe.
- Disconnect and plug three brake fluid lines from master cylinder assembly.
- Remove heat protector bolt from master cylinder bracket.
- Remove two master cylinder ...
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