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Get Full Access Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1991 GMC K1500 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 K1500 Pickup automobile. Try the Automotix DIY solution today!
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We have info for following modifications of 1991 GMC K1500 Pickup

  • 1991 GMC K1500 Pickup Sierra 4.3 V6 GAS, CID:262, Fuel Injection, Aspiration:262, Engine VIN:, Desg:Z
  • 1991 GMC K1500 Pickup Sierra 5.0 V8 GAS, CID:305, Fuel Injection, Aspiration:305, Engine VIN:, Desg:H
  • 1991 GMC K1500 Pickup Sierra 5.7 V8 GAS, CID:350, Fuel Injection, Aspiration:350, Engine VIN:, Desg:K
  • 1991 GMC K1500 Pickup Sierra 6.2 V8 DIESEL, CID:379, Fuel Injection, Aspiration:379, Engine VIN:, Desg:C
  • 1991 GMC K1500 Pickup Sierra XC 4.3 V6 GAS, CID:262, Fuel Injection, Aspiration:262, Engine VIN:, Desg:Z
  • 1991 GMC K1500 Pickup Sierra XC 5.0 V8 GAS, CID:305, Fuel Injection, Aspiration:305, Engine VIN:, Desg:H
  • 1991 GMC K1500 Pickup Sierra XC 5.7 V8 GAS, CID:350, Fuel Injection, Aspiration:350, Engine VIN:, Desg:K
  • 1991 GMC K1500 Pickup Sierra XC 6.2 V8 DIESEL, CID:379, Fuel Injection, Aspiration:379, Engine VIN:, Desg:C

BRAKE SERVICE PROCEDURES FOR 1991 GMC K1500 Pickup AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC K1500 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 K1500 Pickup Sierra 6.2 V8 DIESEL

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 K1500 Pickup BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1991 GMC K1500 Pickup AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC K1500 Pickup cars and light trucks from 1990+.

ANTI-LOCK BRAKES, GENERAL MOTORS -> Four Wheel Anti-Lock Brake System -> DESCRIPTION
Vehicle: 1991 GMC K1500 Pickup Sierra XC 5.0 V8 GAS

This braking system Fig. is designed to reduce the occurrence of wheel lock-up during severe braking conditions. To accomplish this function, the system regulates hydraulic brake line pressure by using an Electronic Hydraulic Control Unit (EHCU) module. This control module has two types of valves. Isolation valves which maintain pressure to each front wheel separately and rear wheels combined. Dump valves which dump pressure to each front wheel separately and rear wheels combined. These valves are controlled by a microcomputer which is part of the EHCU module. During a severe brak...

CLICK HERE TO GET FULL ACCESS TO 1991 GMC K1500 Pickup BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1991 GMC K1500 Pickup AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC K1500 Pickup cars and light trucks from 1990+.

POWER BRAKE UNITS, GENERAL MOTORS -> Tracker Brake Booster -> DESCRIPTION
Vehicle: 1991 GMC K1500 Pickup Sierra 4.3 V6 GAS

This unit, Fig. , uses a single vacuum diaphragm with an effective diameter of 7 inches to mechanically increase brake application force with engine vacuum...

CLICK HERE TO GET FULL ACCESS TO 1991 GMC K1500 Pickup BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1991 GMC K1500 Pickup AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC K1500 Pickup cars and light trucks from 1990+.

POWER BRAKE UNITS, GENERAL MOTORS -> Tracker Brake Booster -> BOOSTER SERVICE -> ASSEMBLE -> DISASSEMBLE
Vehicle: 1991 GMC K1500 Pickup Sierra 5.0 V8 GAS

DISASSEMBLE

  • Remove pushrod clevis and locknut.
  • Install brake booster to brake mounting fixture, Fig. . Ensure booster vacuum pipe is clear of mounting fixture base and the booster mounting nuts are not over tightened.
  • Turn fixture handle until No. 1 and No. 2 body tabs are aligned, Fig. .
  • Remove booster from fixture, then separate body No. 1 and No. 2. This step must be performed with care because there is spring pressure between body No. 1 and No. 2.
  • Remove booster piston spring, piston rod, boot, air cleaner and air cleaner separator from body No. 2.
  • Remove valve stopper key cush...

CLICK HERE TO GET FULL ACCESS TO 1991 GMC K1500 Pickup BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1991 GMC K1500 Pickup AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC K1500 Pickup cars and light trucks from 1990+.

POWER BRAKE UNITS, GENERAL MOTORS -> Bendix Brake Boosters -> TROUBLESHOOTING -> ACCUMULATOR LEAK-DOWN, SYSTEM DOES NOT HOLD CHARGE -> GRABBY BRAKES OR BOOSTER CHATTERS/PEDAL VIBRATES -> SLOW BRAKE PEDAL RETURN
Vehicle: 1991 GMC K1500 Pickup Sierra 4.3 V6 GAS

SLOW BRAKE PEDAL RETURN

  • Excessive seal friction in booster.
  • Faulty spool action.
  • Restriction in return line from booster to pump reservoir.
  • Damaged input rod end.

GRABBY BRAKES OR BOOSTER CHATTERS/PEDAL VIBRATES

  • Faulty spool action caused by contamination in ...

CLICK HERE TO GET FULL ACCESS TO 1991 GMC K1500 Pickup BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1991 GMC K1500 Pickup AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC K1500 Pickup cars and light trucks from 1990+.

ANTI-LOCK BRAKES, GENERAL MOTORS -> Four Wheel Anti-Lock Brake System -> SYSTEM SERVICE -> BLEEDING EHCU MODULE
Vehicle: 1991 GMC K1500 Pickup Sierra 6.2 V8 DIESEL

BLEEDING EHCU MODULE

The EHCU Module should be bled after replacement or if trapped air is in the unit. If bleeding is required the module must be bled thoroughly before the wheel cylinders and calipers.

There are two bleeders on top of the unit that appear to be normal bleeders, Fig. . These are modulator bleeders and must remain closed when the unit is not pressurized.

The internal bleeders are on either side of EHCU module. The valves are used to open the internal passages within the EHCU module. Both bleed valves must be rotated 1/4-1/2 a turn counterclockwise before beginning t...

CLICK HERE TO GET FULL ACCESS TO 1991 GMC K1500 Pickup BRAKE SERVICE PROCEDURES

Shop online for auto body parts, engines, wheels, lights...

Click here to view more details about 2005 GMC Yukon Door Handle, Front, Passenger Side2005 GMC Yukon Door Handle, Front, Passenger Side, With keyhole; A high quality, OE replacement door handle; Backed by 1-year, unlimited-mileage warranty..

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$14.34

Click here to view more details about 1999 GMC K1500 Cab Light1999 GMC K1500 Cab Light, With clear lens; A high quality, direct fit OE replacement cab roof light set; Easy installation using included hardware and simple tools..

Source: Auto Body Parts Store

$47.72

Click here to view more details about 2005 GMC Safari Van Tail Light Assembly , Passenger Side2005 GMC Safari Van Tail Light Assembly , Passenger Side, PASSENGER SIDE TAIL LIGHT ASSEMBLY , , .

Source: Wheels / Rims, Mirrors & Lights Store

$35.68

Click here to view more details1991 GMC K1500 Pickup Sierra XC V8, 6.2 L, 379 CID Rebuilt Engine, Diesel, without injection pump or injectors, Warranty: 7-Year/70,000 Mile, .

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$2,800.00

Click here to view more details1988 GMC K1500 Pickup Used Condenser Assembly, 7.4, COL, 4X4 VIN models C/K, early, Good.

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$105.00

Click here to view more details1996 GMC K1500 Pickup Used Air Flow Meter/Sensor, 5.7, AUTO, 4X4, Very Good.

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$55.00
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