1991 Oldsmobile 98 Brake Service (ONLINE REPAIR MANUALS)

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We have info for following modifications of 1991 Oldsmobile 98

  • 1991 Oldsmobile 98 Regency Touring 3.8 V6 GAS, CID:231, Fuel Injection, Aspiration:231, Engine VIN:, Desg:L
  • 1991 Oldsmobile 98 Regency Elite 3.8 V6 GAS, CID:231, Fuel Injection, Aspiration:231, Engine VIN:, Desg:L

BRAKE SERVICE PROCEDURES FOR 1991 Oldsmobile 98 AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 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: 1991 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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BRAKE SERVICE PROCEDURES FOR 1991 Oldsmobile 98 AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Oldsmobile 98 cars and light trucks from 1990+.

DISC BRAKES, GENERAL MOTORS -> General Information -> GENERAL PRECAUTIONS
Vehicle: 1991 Oldsmobile 98 Regency Elite 3.8 V6 GAS

  • Grease or any other foreign material must be kept off the brake linings, caliper, surfaces of the disc and external surfaces of the hub, during service procedures. Handling the brake disc and caliper should be done in a way to avoid deformation of the disc and nicking or scratching brake linings.
  • If inspection reveals rubber piston seals are worn or damaged, they should be replaced immediately.
  • During removal and installation of a wheel assembly, exercise care so as not to interfer...

CLICK HERE TO GET FULL ACCESS TO 1991 Oldsmobile 98 BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1991 Oldsmobile 98 AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Oldsmobile 98 cars and light trucks from 1990+.

DISC BRAKES, GENERAL MOTORS -> General Information -> BRAKE DISC SERVICE
Vehicle: 1991 Oldsmobile 98 Regency Touring 3.8 V6 GAS

Servicing of disc brakes is extremely critical due to the close tolerances required in machining the brake disc to insure proper brake operation.

The maintenance of these close controls of the shape of the rubbing surfaces is necessary to prevent brake roughness. In addition, the surface finish must be non-directional and maintained at a micro inch finish. This close control of the rubbing surface finish is necessary to avoid pulls and erratic performance, and to promote long lining life and equal lining wear of both left and right brakes.

In light of the foregoing remarks, ref...

CLICK HERE TO GET FULL ACCESS TO 1991 Oldsmobile 98 BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1991 Oldsmobile 98 AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Oldsmobile 98 cars and light trucks from 1990+.

HYDRAULIC BRAKE SYSTEM, GENERAL MOTORS -> WHEEL CYLINDER OVERHAUL
Vehicle: 1991 Oldsmobile 98 Regency Elite 3.8 V6 GAS

  • Raise and support vehicle.
  • Remove wheel, drum and brake shoes.
  • Disconnect hydraulic line at wheel cylinder.Do not pull metal line away from cylinder, as this may kink or bend line. Line will separate from cylinder when cylinder is moved away from brake backing plate.
  • Remove wheel cylinder-to-brake plate attaching screws, then the wheel cylinder.
  • Remove boots, pistons, springs and cups from cylinder,Fig. .
  • Clean all parts with brake fluid.
  • Inspect cylinder bore. A scored bore may be honed as long as the diameter is not increased by m...

CLICK HERE TO GET FULL ACCESS TO 1991 Oldsmobile 98 BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1991 Oldsmobile 98 AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Oldsmobile 98 cars and light trucks from 1990+.

ANTI-LOCK BRAKES, GENERAL MOTORS -> 1991 Bonneville, DeVille, Eighty Eight, Fleetwood, LeSabre, Ninety Eight & Park Avenue (Treves Type) -> COMPONENT REPLACEMENT -> ELECTRONIC BRAKE CONTROL MODULE (EBCM) -> Front -> PRESSURE MODULATOR VALVE (PMV) -> PROPORTIONER VALVE -> Rear -> WHEEL SPEED SENSOR RINGS -> WHEEL SPEED SENSORS
Vehicle: 1991 Oldsmobile 98 Regency Elite 3.8 V6 GAS

ELECTRONIC BRAKE CONTROL MODULE (EBCM)

Ignition switch must be in the Off position prior to disconnecting or connecting the EBCM.

  • Remove right and left sound insulators.
  • Disconnect floor outlet, then remove bolt retaining EBCM, Fig. .
  • Slide EBCM toward accelerator pedal just far enough to expose connector.
  • Disconnect EBCM harness connector, then remove EBCM.
  • Reverse procedure to install. Torque EBCM retaining bolt to 19 inch lbs.

WHEEL SPEED SENSORS

Front

Wheel speed sensor is non-adjustable. Left and right speed sensors are not interchangeable.

Proper installation of speed sensor c...

CLICK HERE TO GET FULL ACCESS TO 1991 Oldsmobile 98 BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1991 Oldsmobile 98 AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Oldsmobile 98 cars and light trucks from 1990+.

DRUM BRAKES, GENERAL MOTORS -> Type 5 -> INSPECTION
Vehicle: 1991 Oldsmobile 98 Regency Elite 3.8 V6 GAS

  • If any parts are of doubtful strength or quality due to heat discoloration, or are worn, replace them.
  • Inspect wheel cylinder dust boots for signs of excessive wear or damage.
  • Inspect adjusting screw for smooth operation over full length.
  • Clean adjusting screw components in denatured alcohol.Ensure spring clip is installed in correct position, Fig. .
  • Apply suitable lubricant to adjuster screw threads, inside diameter of socket and socket face. Adequate lubrication is achieve...

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