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Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1990 GMC C3500 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 1990 GMC C3500 Pickup automobile. Try the Automotix DIY solution today!
We have info for following modifications of 1990 GMC C3500 Pickup
- 1990 GMC C3500 Pickup Sierra 6.2 V8 DIESEL, CID:379, Fuel Injection, Aspiration:379, Engine VIN:, Desg:J
- 1990 GMC C3500 Pickup Sierra 5.7 V8 GAS, CID:350, Fuel Injection, Aspiration:350, Engine VIN:, Desg:K
- 1990 GMC C3500 Pickup Sierra 7.4 V8 GAS, CID:454, Fuel Injection, Aspiration:454, Engine VIN:, Desg:N
- 1990 GMC C3500 Pickup Sierra XC 6.2 V8 DIESEL, CID:379, Fuel Injection, Aspiration:379, Engine VIN:, Desg:J
- 1990 GMC C3500 Pickup Sierra XC 5.7 V8 GAS, CID:350, Fuel Injection, Aspiration:350, Engine VIN:, Desg:K
- 1990 GMC C3500 Pickup Sierra XC 7.4 V8 GAS, CID:454, Fuel Injection, Aspiration:454, Engine VIN:, Desg:N
BRAKE SERVICE PROCEDURES FOR 1990 GMC C3500 Pickup AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 GMC C3500 Pickup cars and light trucks from 1990+.
DISC BRAKES, GENERAL MOTORS -> Delco-Moraine Single Piston Caliper -> DESCRIPTION
Vehicle: 1990 GMC C3500 Pickup Sierra XC 6.2 V8 DIESEL
The caliper assembly, Fig. , slides on its mounting surfaces. Upon brake application, hydraulic pressure against the piston forces the inboard pad against the inboar...
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BRAKE SERVICE PROCEDURES FOR 1990 GMC C3500 Pickup AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 GMC C3500 Pickup cars and light trucks from 1990+.
HYDRAULIC BRAKE SYSTEMS, GENERAL MOTORS -> MASTER CYLINDER SERVICE -> Assemble -> BENDIX TYPE -> CAST IRON TYPE -> COMPOSITE TYPE -> DELCO MORAINE TYPE -> Disassemble -> Inspection -> TRACKER MODELS
Vehicle: 1990 GMC C3500 Pickup Sierra 7.4 V8 GAS
DELCO MORAINE TYPE
COMPOSITE TYPE
Refer to Figs. and when performing the following procedures.
Disassemble
- Remove master cylinder from vehicle.
- Remove reservoir cover and diaphragm. Discard old brake fluid in reservoir.
- Inspect cover and diaphragm. Replace if cut, cracked or deformed.
- Remove fluid level switch and proportioner valve assembly, if equipped.
- Depress primary piston and remove lock ring.
- Plug primary fluid outlet (outlet nearest to cowl when master cylinder is installed), then apply compressed air into secondary fluid outlet to remove primary and secondary pistons.
- R...
CLICK HERE TO GET FULL ACCESS TO 1990 GMC C3500 Pickup BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1990 GMC C3500 Pickup AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 GMC C3500 Pickup cars and light trucks from 1990+.
HYDRAULIC BRAKE SYSTEMS, GENERAL MOTORS -> HEIGHT SENSING PROPORTIONING VALVE, Adjust
Vehicle: 1990 GMC C3500 Pickup Sierra 7.4 V8 GAS
The height sensing proportioning valve must be adjusted whenever the valve and/or linkage is disassembled or removed for service. In addition, adjustment should be checked if excessive front wheel lock-up is experienced with a lower than desired brake application rate when vehicle is at or near maximum GVWR.
- Raise and support vehicle leaving wheels on, and allow axle to hang free (no load condition).
- Remove lever retaining nut and disconnect lever from valve shaft, Fig. .
- Rotate valve shaft to permit installation of correct adjustment gauge, Fig. ,...
CLICK HERE TO GET FULL ACCESS TO 1990 GMC C3500 Pickup BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1990 GMC C3500 Pickup AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 GMC C3500 Pickup cars and light trucks from 1990+.
POWER BRAKE UNITS, GENERAL MOTORS -> General Service -> CHECKING COMPLAINTS
Vehicle: 1990 GMC C3500 Pickup Sierra XC 7.4 V8 GAS
Diagnose power brakes systems as if two separate systems exist. Check for faults in the regular brake system first. If no problem exists in the regular brake system, diagnosis the power brake circuit is necessary. For a quick check of proper power unit operation, press the brake pedal firmly and then start the engine. The pedal should fall away slightly and less pressure should be needed to maintain the pedal in any position. On vacuum suspended power units, air will rush into the air intake when the brakes are applied.
To perform another check, remove the stop light switch, ...
CLICK HERE TO GET FULL ACCESS TO 1990 GMC C3500 Pickup BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1990 GMC C3500 Pickup AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 GMC C3500 Pickup cars and light trucks from 1990+.
POWER BRAKE UNITS, GENERAL MOTORS -> Bendix Brake Boosters -> HYDRO-BOOST II -> BLEEDING BOOSTER -> CLEANING & INSPECTION -> DESCRIPTION -> DISASSEMBLE & ASSEMBLE
Vehicle: 1990 GMC C3500 Pickup Sierra XC 5.7 V8 GAS
DESCRIPTION
Hydro-Boost II is an hydraulically operated power brake booster. The hydraulic brake booster consists of an open center spool valve and an hydraulic cylinder combined into a single housing. The power steering pump provides the hydraulic fluid pressure to operate both the power brake booster and the power steering gear.
A dual master cylinder is bolted to the brake booster and is operated by a pushrod projecting from the booster cylinder bore.
The Hydro-Boost II also has an accumulator system which stores sufficient fluid under pressure to provide one power assisted brake...
CLICK HERE TO GET FULL ACCESS TO 1990 GMC C3500 Pickup BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1990 GMC C3500 Pickup AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 GMC C3500 Pickup cars and light trucks from 1990+.
POWER BRAKE UNITS, GENERAL MOTORS -> Delco-Moraine Brake Boosters -> SINGLE DIAPHRAGM TYPE -> Assemble -> BOOSTER SERVICE -> DESCRIPTION -> Disassemble -> OPERATION
Vehicle: 1990 GMC C3500 Pickup Sierra XC 5.7 V8 GAS
DESCRIPTION
These power brake units, Figs. and , are a combination vacuum-hydraulic brake booster of the vacuum suspended type which use engine intake manifold vacuum and atmospheric pressure for its power.
These units consist of a vacuum power section and an hydraulic master cylinder section. The vacuum power section contains a power piston with rolling diaphragm mechanism and power piston return spring.
The control valve is made up of an air valve and floating vacuum control valve assembly. The reaction mechanism consists of an hydraulic piston, reaction plate and a series...
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