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Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1990 Oldsmobile 98 car and truck
repair procedures including Oldsmobile engine diagrams, wiring diagrams, repair work estimating measures, technical service bulletins, auto body work
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We have info for following modifications of 1990 Oldsmobile 98
- 1990 Oldsmobile 98 Regency 3.8 V6 GAS, CID:231, Fuel Injection, Aspiration:231, Engine VIN:, Desg:C
- 1990 Oldsmobile 98 Regency Brougham 3.8 V6 GAS, CID:231, Fuel Injection, Aspiration:231, Engine VIN:, Desg:C
- 1990 Oldsmobile 98 Regency Touring 3.8 V6 GAS, CID:231, Fuel Injection, Aspiration:231, Engine VIN:, Desg:C
BRAKE SERVICE PROCEDURES FOR 1990 Oldsmobile 98 AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 Oldsmobile 98 cars and light trucks from 1990+.
ANTI-LOCK BRAKES, GENERAL MOTORS -> 1990 Bonneville, DeVille, Eighty-Eight, Electra, Fleetwood, Ninety-Eight, Park Avenue & 6000 (Teves Type) -> COMPONENT REPLACEMENT -> FLUID RESERVOIR & SEALS -> Front Wheel -> HYDRAULIC ACCUMULATOR -> HYDRAULIC UNIT -> PRESSURE/WARNING SWITCH -> PUMP MOTOR ASSEMBLY -> Rear Wheel -> VALVE BLOCK ASSEMBLY -> WHEEL SENSOR
Vehicle: 1990 Oldsmobile 98 Regency Touring 3.8 V6 GAS
HYDRAULIC UNIT
- Disconnect battery ground cable.
- Depressurize accumulator, refer to .. "Depressurizing Hydraulic Accumulator" procedure.
- Disconnect all hydraulic unit electrical connectors, then remove all brake fluid from fluid reservoir.
- Remove pump attaching bolt, then position energy unit aside to gain access to brake pipes.
- Disconnect hydraulic lines to valve block. Use caution not to twist lines.
- On 6000 models, remove line attaching hydraulic unit to combination valve.
- On all models, disconnect push rod from brake pedal, then push dust boot forward, past hex on pushrod.
- Separa...
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BRAKE SERVICE PROCEDURES FOR 1990 Oldsmobile 98 AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 Oldsmobile 98 cars and light trucks from 1990+.
HYDRAULIC BRAKE SYSTEM, GENERAL MOTORS -> MASTER CYLINDER SERVICE -> Assembly -> CAST IRON TYPE -> COMPOSITE TYPE -> CORVETTE -> Disassembly -> EXCEPT CORVETTE -> Inspection
Vehicle: 1990 Oldsmobile 98 Regency 3.8 V6 GAS
COMPOSITE TYPE
Refer toFigs. and when performing the following procedures.
EXCEPT CORVETTE
Disassembly
- Remove master cylinder from vehicle as follows:
- Disconnect and plug hydraulic lines.
- Remove two master cylinder attaching nuts, then the master cylinder.
- 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, if equipped.
- On models with compact master cylinder, remove proportioner valve assembly,Fig. .
- Depress primary piston and remove lock ring.
- Plug primary fluid ou...
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BRAKE SERVICE PROCEDURES FOR 1990 Oldsmobile 98 AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 Oldsmobile 98 cars and light trucks from 1990+.
ANTI-LOCK BRAKES, GENERAL MOTORS -> 1990 Bonneville, DeVille, Eighty-Eight, Electra, Fleetwood, Ninety-Eight, Park Avenue & 6000 (Teves Type) -> DIAGNOSIS -> 1990 6000 -> 1990 MODELS EXCEPT 6000 -> ABS FUNCTIONAL CHECK -> ABS PRE-DIAGNOSIS INSPECTION -> ABS SYMPTOM DIAGNOSIS -> ABS TROUBLE CODE DIAGNOSIS -> BASIC DIAGNOSTIC PROCEDURE -> CLEARING ABS CODES -> DIAGNOSTIC TESTS -> DISPLAYING ABS TROUBLE CODES -> ELECTRICAL CONNECTOR IDENTIFICATION & LOCATION -> HISTORY & CURRENT ABS CODES -> LAMP SEQUENCE DETERMINATION -> LAMP SEQUENCE TEST PROCEDURE -> NOTE ON INTERMITTENTS -> PRE-DIAGNOSIS INSPECTION -> READING ABS TROUBLE CODES -> SELF-DIAGNOSIS -> SYSTEM VOLTAGE DURING DIAGNOSIS -> WIRING DIAGRAMS
Vehicle: 1990 Oldsmobile 98 Regency 3.8 V6 GAS
1990 6000
WIRING DIAGRAMS
Refer to "Wiring Diagrams" in "Vehicle Systems".
ELECTRICAL CONNECTOR IDENTIFICATION & LOCATION
Diagnosis of system malfunctions requires three basic steps which must be followed in order to isolate the fault accurately and quickly. The proper diagnostic procedure consists of the following steps: Pre-Diagnosis Inspection, Lamp Sequence Determination and Component Test Charts. Refer to connector location and identification Figs. and , and circuit locationFig. , when performing diagnosis on this system.
PRE-DIAGNOSIS INSPECTION
The pre-diagnosis inspection consists of ...
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BRAKE SERVICE PROCEDURES FOR 1990 Oldsmobile 98 AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 Oldsmobile 98 cars and light trucks from 1990+.
DISC BRAKES, GENERAL MOTORS -> General Information -> INSPECTION OF CALIPER
Vehicle: 1990 Oldsmobile 98 Regency 3.8 V6 GAS
Should it become necessary to remove the caliper for installation of new parts, clean all parts in alcohol, wipe dry using lint free cloths, using an air hose to blow out drilled passages and bores. Check dust boots for punctures or tears. If punctures or tears are evident, new boots should be installed upon reassembly.
Inspect piston bores for scoring or pitting. Bores that show light scratches or corrosion can usually be cleaned with crocus cloth. However, bores that have deep scratches or scoring may be honed, provided the diameter of the...
CLICK HERE TO GET FULL ACCESS TO 1990 Oldsmobile 98 BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1990 Oldsmobile 98 AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 Oldsmobile 98 cars and light trucks from 1990+.
POWER BRAKE UNITS, GENERAL MOTORS -> GENERAL SERVICE -> AIR METHOD -> Delco-Moraine Type -> GAUGE METHOD -> POWER BOOSTER REPLACE -> PRECAUTIONS -> PUSHROD ADJUSTMENT -> Single Diaphragm Type
Vehicle: 1990 Oldsmobile 98 Regency Brougham 3.8 V6 GAS
Two basic types of power assist mechanisms are used: vacuum assist diaphragm assemblies, which use engine vacuum or, in some cases vacuum pressure developed by an external vacuum pump. The second type is a hydraulic pressure assist mechanism, which use pressure developed by an external pump (usually the power steering pump). Both systems act to increase the force exerted on the master cylinder piston by the operator. This in turn increases the hydraulic pressure delivered to the wheel cylinders, while decreasing driver effort necessary to obtain acceptable stopping performance.
V...
CLICK HERE TO GET FULL ACCESS TO 1990 Oldsmobile 98 BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1990 Oldsmobile 98 AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 Oldsmobile 98 cars and light trucks from 1990+.
HYDRAULIC BRAKE SYSTEM, GENERAL MOTORS -> SYSTEM OPERATION -> Diagonally Split System -> DUAL MASTER CYLINDER -> Front & Rear Split System
Vehicle: 1990 Oldsmobile 98 Regency Touring 3.8 V6 GAS
DUAL MASTER CYLINDER
Front & Rear Split System
When the brake pedal is depressed, both the primary (front brake) and the secondary (rear brake) master cylinder pistons are moved simultaneously to exert hydraulic fluid pressure on their respective systems,Figs. and .
If the rear (secondary) brake system fails, initial brake pedal movement will cause the unrestricted secondary piston to bottom in the master cylinder bore. Primary piston movement will displace hydraulic fluid in the primary section of the master cylinder to actuate the front brake system.
If the front (primary) brak...
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