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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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your 1990 Oldsmobile 98 automobile. Try the Automotix DIY solution today!
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) -> SYSTEM COMPONENTS -> ANTI-LOCK WARNING LAMP -> BRAKE WARNING LAMP -> ELECTRONIC BRAKE CONTROL MODULE (EBCM) -> HYDRAULIC UNIT -> TIMER FLASHER MODULE
Vehicle: 1990 Oldsmobile 98 Regency 3.8 V6 GAS
The anti-lock brake system, Fig. , consists of a pump motor assembly, fluid accumulator, pressure switch, fluid reservoir with integral filter, hydraulic booster/master cylinder, wheel speed sensors, Electronic Brake Control Module (EBCM) and a valve block assembly.
ELECTRONIC BRAKE CONTROL MODULE (EBCM)
The EBCM monitors speed of each wheel to determine if any wheel is beginning to lock. If a locking condition is sensed, brake pressures are automatically adjusted to provide for maximum stopping without wheel lock.
TIMER FLASHER MODULE
On some models, the pump circuit includes a t...
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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) -> SYSTEM SERVICE -> BRAKE SYSTEM BLEEDING -> BRAKE SYSTEM FILLING -> DEPRESSURIZING HYDRAULIC ACCUMULATOR -> Front Circuit -> Manual Bleeding -> Pressure Bleeding -> Rear Circuit
Vehicle: 1990 Oldsmobile 98 Regency Touring 3.8 V6 GAS
DEPRESSURIZING HYDRAULIC ACCUMULATOR
Depressurize accumulator before performing any ABS service.
- Disconnect battery ground cable or place ignition switch in the Off position.
- Apply and release brake pedal a minimum of 20 times using approximately 50 lbs. of force on pedal. A noticeable change in pedal feel will occur when accumulator is completely discharged. If battery negative cable was disconnected, reactivate Delco-Loc radios by turning ignition and radio to the On position, then pressing the Mute button on the steering wheel control.
BRAKE SYSTEM FILLING
Ensure pump is not allowe...
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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+.
POWER BRAKE UNITS, GENERAL MOTORS -> DELCO-MORAINE TANDEM DIAPHRAGM TYPE -> Assembly -> Brakes Grab -> DESCRIPTION -> Disassembly -> Hard Pedal -> OVERHAUL -> Slow Or No Release -> TROUBLESHOOTING
Vehicle: 1990 Oldsmobile 98 Regency 3.8 V6 GAS
DESCRIPTION
This unit utilizes a vacuum power chamber, consisting of a front and rear shell, housing divider, front and rear diaphragm, plate assemblies, hydraulic pushrod and a diaphragm return spring,Figs. and .
The unit operates in much the same manner as the single diaphragm unit described previously. The diaphragm and plate assemblies utilize the pressure differential between the engine intake manifold vacuum and atmospheric pressure to assist in braking.
TROUBLESHOOTING
Hard Pedal
- Internal vacuum leak.
- Faulty control valve.
Brakes Grab
- Faulty control valve...
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 -> COMPONENT DESCRIPTION -> BRAKE DISTRIBUTION VALVE & SWITCH -> BRAKE WARNING LAMP SWITCHES -> COMBINATION VALVE -> Failure Warning Switch -> Fluid Level Sensor -> Metering Valve -> Proportioning or Pressure Control Valve -> Testing Warning Lamp Operation
Vehicle: 1990 Oldsmobile 98 Regency Brougham 3.8 V6 GAS
BRAKE WARNING LAMP SWITCHES
There are four basic types of brake warning lamp switches as shown,Figs. through . When a pressure differential occurs between the front and rear brake systems, the valves will shuttle toward the side with the low pressure.
In the switch shown inFig. , movement of the differential valve forces the switch plunger upward over the tapered shoulder of the valve to close the switch contacts and light the dual brake warning lamp, signaling a brake system failure.
InFig. , the valve assembly consists of two valves in a common bore that are spring loaded ...
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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+.
DRUM BRAKES, GENERAL MOTORS -> General Information -> SERVICE PRECAUTIONS
Vehicle: 1990 Oldsmobile 98 Regency 3.8 V6 GAS
When working on or around brake assemblies, care must be taken to prevent breathing asbestos dust, as many manufacturers incorporate asbestos fibers in the production of brake linings. During routine service operations the amount of asbestos dust from brake lining wear is at a low level due to a chemical breakdown during use, and a few precautions will minimize exposure.
- Do not sand or grind brake linings unless suitable local exhaust ventilation equipment is used to prevent excessive asbestos exposure.
- Wear a suitable respirator approved for asbestos dust use during all repai...
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+.
DISC BRAKES, GENERAL MOTORS -> General Information -> TESTING PROPORTIONING VALVE
Vehicle: 1990 Oldsmobile 98 Regency 3.8 V6 GAS
When a premature rear wheel slide is obtained on a brake application, it usually is an indication that the fluid pressure to the rear wheels is above the 50% reduction ratio for the rear line pressure and that malfunction has occurred within the proportioning valve.
To test the valve, install gauge set shown in Fig. in brake line between master cylinder and proportioning valve, and at outpu...
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