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Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1991 GMC K3500 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 K3500 Pickup automobile. Try the Automotix DIY solution today!
We have info for following modifications of 1991 GMC K3500 Pickup
- 1991 GMC K3500 Pickup Sierra 6.2 V8 DIESEL, CID:379, Fuel Injection, Aspiration:379, Engine VIN:, Desg:J
- 1991 GMC K3500 Pickup Sierra 5.7 V8 GAS, CID:350, Fuel Injection, Aspiration:350, Engine VIN:, Desg:K
- 1991 GMC K3500 Pickup Sierra 7.4 V8 GAS, CID:454, Fuel Injection, Aspiration:454, Engine VIN:, Desg:N
- 1991 GMC K3500 Pickup Sierra XC 6.2 V8 DIESEL, CID:379, Fuel Injection, Aspiration:379, Engine VIN:, Desg:J
- 1991 GMC K3500 Pickup Sierra XC 5.7 V8 GAS, CID:350, Fuel Injection, Aspiration:350, Engine VIN:, Desg:K
- 1991 GMC K3500 Pickup Sierra XC 7.4 V8 GAS, CID:454, Fuel Injection, Aspiration:454, Engine VIN:, Desg:N
BRAKE SERVICE PROCEDURES FOR 1991 GMC K3500 Pickup AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC K3500 Pickup cars and light trucks from 1990+.
ANTI-LOCK BRAKES, GENERAL MOTORS -> Rear Wheel Anti-Lock Brake System -> DESCRIPTION
Vehicle: 1991 GMC K3500 Pickup Sierra XC 7.4 V8 GAS
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 ...
CLICK HERE TO GET FULL ACCESS TO 1991 GMC K3500 Pickup BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 GMC K3500 Pickup AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC K3500 Pickup cars and light trucks from 1990+.
DISC BRAKES, GENERAL MOTORS -> Delco-Moraine Single Piston Caliper -> CALIPER SERVICE -> ASSEMBLE -> DISASSEMBLE -> INSTALLATION -> REMOVAL
Vehicle: 1991 GMC K3500 Pickup Sierra 5.7 V8 GAS
REMOVAL
- Siphon enough brake fluid out of the master cylinder to bring fluid level to1-3 full to avoid fluid overflow when the caliper piston is pushed back into its bore.
- Raise and support vehicle, remove front wheels.
- Using a C-clamp, as illustrated in Fig. , push piston back into its bore.
- Remove two mounting bolts and lift caliper away from disc.
DISASSEMBLE
- Disconnect hose from the caliper being careful not to lose copper washers.
- Remove caliper as outlined above.
- Drain brake fluid from caliper.
- Pad caliper interior with clean shop towels and apply compressed air to remove piston, Fi...
CLICK HERE TO GET FULL ACCESS TO 1991 GMC K3500 Pickup BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 GMC K3500 Pickup AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC K3500 Pickup cars and light trucks from 1990+.
POWER BRAKE UNITS, GENERAL MOTORS -> Tracker Brake Booster -> POWER BRAKE UNIT, Replace
Vehicle: 1991 GMC K3500 Pickup Sierra 6.2 V8 DIESEL
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 ...
CLICK HERE TO GET FULL ACCESS TO 1991 GMC K3500 Pickup BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 GMC K3500 Pickup AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC K3500 Pickup cars and light trucks from 1990+.
DRUM BRAKES, GENERAL MOTORS -> Drum Brake Service -> Installation -> 1990-91 C & K SERIES w/NON-SERVO BRAKES -> EXCEPT TRACKER, 1990-91 C & K SERIES w/NON-SERVO BRAKES -> TRACKER
Vehicle: 1991 GMC K3500 Pickup Sierra XC 5.7 V8 GAS
EXCEPT TRACKER, 1990-91 C & K SERIES w/NON-SERVO BRAKES
- Lubricate parking brake lever fulcrum with suitable brake lube, then attach lever to brake shoe. Ensure lever operates smoothly.
- Connect brake shoes with adjusting screw spring, then position adjusting screw. Ensure adjusting screw star wheel does not contact adjusting screw spring after installation, and also ensure RH thread adjusting screw is installed on left side of vehicle and LH thread adjusting screw is installed on right side of vehicle. When brake shoe installation is completed, ensure star wheel lines up with adjustin...
CLICK HERE TO GET FULL ACCESS TO 1991 GMC K3500 Pickup BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 GMC K3500 Pickup AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC K3500 Pickup cars and light trucks from 1990+.
DISC BRAKES, GENERAL MOTORS -> Bendix Single Piston Sliding Caliper -> DESCRIPTION
Vehicle: 1991 GMC K3500 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 K3500 Pickup BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 GMC K3500 Pickup AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC K3500 Pickup cars and light trucks from 1990+.
POWER BRAKE UNITS, GENERAL MOTORS -> Delco-Moraine Brake Boosters -> POWER BRAKE UNIT, Replace -> 1990-91 C & K SERIES -> ASTRO & SAFARI VAN -> CABALLERO & EL CAMINO -> FULL SIZE EXCEPT 1990-91 C & K SERIES -> LUMINA APV, SILHOUTTE & TRANS SPORT -> S/T 10 & 15 & BRAVADA
Vehicle: 1991 GMC K3500 Pickup Sierra 5.7 V8 GAS
CABALLERO & EL CAMINO
- Remove vacuum hose from check valve and master cylinder retaining nuts.
- Pull master cylinder forward so it clears mounting studs and move to one side. Support cylinder to avoid stress on hydraulic lines.
- Remove power unit to dash nuts.
- Remove brake pedal pushrod retainer and disconnect pushrod from pin.
- Remove power brake unit from vehicle.
- Reverse procedure to install.
ASTRO & SAFARI VAN
- Disconnect master cylinder from power brake unit.
- Disconnect power brake unit pushrod from brake pedal.
- Remove power brake unit retaining nuts and the power brake unit.
- Rev...
CLICK HERE TO GET FULL ACCESS TO 1991 GMC K3500 Pickup BRAKE SERVICE PROCEDURES
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