1993 Buick Lesabre Brake Service (ONLINE REPAIR MANUALS)

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We have info for following modifications of 1993 Buick Lesabre

  • 1993 Buick Lesabre Custom 3.8 V6 GAS, CID:231, Fuel Injection, Aspiration:231, Engine VIN:, Desg:L
  • 1993 Buick Lesabre Limited 3.8 V6 GAS, CID:231, Fuel Injection, Aspiration:231, Engine VIN:, Desg:L

BRAKE SERVICE PROCEDURES FOR 1993 Buick Lesabre AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1993 Buick Lesabre cars and light trucks from 1990+.

Drum Brakes -> Type 8 -> Brake Service -> INSTALLATION -> REMOVAL
Vehicle: 1993 Buick Lesabre Custom 3.8 V6 GAS

REMOVAL
  • Raise and support vehicle.
  • Mark relationship of wheel to axle, then remove wheel and tire assembly.
  • Remove brake drum. If drum is difficult to remove, proceed as follows:
    • Ensure parking brake is released.
    • Back off parking brake cable adjustment.
    • Remove access hole plug from backing plate, insert screwdriver through hole and push parking brake lever off its stop.
    • Insert punch through hole in splash shield Fig. , tap on punch to loosen drum. Then remove drum.
  • Remove actuator spring using special brake tool J 38400 or equivalent to pry loop end of spring from adjuster actuator, Fig. ...

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BRAKE SERVICE PROCEDURES FOR 1993 Buick Lesabre AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1993 Buick Lesabre cars and light trucks from 1990+.

Power Brake Units -> Description -> AC-DELCO SINGLE DIAPHRAGM TYPE -> AC-DELCO TANDEM DIAPHRAGM TYPE -> BCIA SINGLE & TANDEM DIAPHRAGM TYPE
Vehicle: 1993 Buick Lesabre Limited 3.8 V6 GAS

AC-DELCO TANDEM DIAPHRAGM TYPE

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.

AC-DELCO SINGLE DIAPHRAGM TYPE

The AC-Delco power booster assembly, Fig. is located along the bulkhead in ...

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BRAKE SERVICE PROCEDURES FOR 1993 Buick Lesabre AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1993 Buick Lesabre cars and light trucks from 1990+.

Power Brake Units -> Adjustments -> AC-Delco Type -> AIR METHOD -> BRAKE PEDAL -> GAUGE METHOD -> PUSHROD -> Single Diaphragm Type -> Toyota/GM Single Diaphragm Type
Vehicle: 1993 Buick Lesabre Limited 3.8 V6 GAS

BRAKE PEDAL
Toyota/GM Single Diaphragm Type
  • With engine running and brake pedal in rest position, measure distance between face of pedal and floor mat.
  • If distance is not 5.79-6.18 inches, adjust pedal height as follows:
    • Remove left lower instrument panel trim section and air duct.
    • Loosen stop lamp switch sufficiently to gain clearance for pedal adjustment.
    • Loosen locknut and rotate pedal pushrod as needed to obtain specified pedal height, then tighten locknut.
    • Adjust position of brake light switch so that plunger lightly contacts pedal stopper and brake lamps are off when pedal is release...

CLICK HERE TO GET FULL ACCESS TO 1993 Buick Lesabre BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1993 Buick Lesabre AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1993 Buick Lesabre cars and light trucks from 1990+.

Drum Brakes -> Type 8 -> Brake Service -> INSTALLATION -> REMOVAL
Vehicle: 1993 Buick Lesabre Limited 3.8 V6 GAS

REMOVAL
  • Raise and support vehicle.
  • Mark relationship of wheel to axle, then remove wheel and tire assembly.
  • Remove brake drum. If drum is difficult to remove, proceed as follows:
    • Ensure parking brake is released.
    • Back off parking brake cable adjustment.
    • Remove access hole plug from backing plate, insert screwdriver through hole and push parking brake lever off its stop.
    • Insert punch through hole in splash shield Fig. , tap on punch to loosen drum. Then remove drum.
  • Remove actuator spring using special brake tool J 38400 or equivalent to pry loop end of spring from adjuster actuator, Fig. ...

CLICK HERE TO GET FULL ACCESS TO 1993 Buick Lesabre BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1993 Buick Lesabre AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1993 Buick Lesabre cars and light trucks from 1990+.

Anti-lock Brakes -> Bonneville, Eighty Eight, LeSabre, Ninety Eight, Park Avenue, 1992 DeVille & Fleetwood (FWD) (Teves Type) -> Description -> BRAKE WARNING LAMP -> ELECTRONIC BRAKE CONTROL MODULE (EBCM) -> WHEEL SPEED SENSORS
Vehicle: 1993 Buick Lesabre Custom 3.8 V6 GAS

Refer to Fig. , for overview of anti-lock brake system.

The purpose of the anti-lock brake system is to prevent wheel lock-up under heavy braking conditions, on virtually any road surface. When a wheel locking condition exists, the pressure modulator valve (PMV) assembly isolates each wheel hydraulic circuit, then begins modulation of fluid pressure to each wheel according to wheel speed input to the EBCM. The PMV is controlled by the Electronic Brake Control Module (EBCM).

Modulation occurs by means of three ABS modes: pressure hold, pressure reduce and pressure increase. The PMV ass...

CLICK HERE TO GET FULL ACCESS TO 1993 Buick Lesabre BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1993 Buick Lesabre AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1993 Buick Lesabre cars and light trucks from 1990+.

Hydraulic Brake Systems -> Description -> BRAKE DISTRIBUTION VALVE & SWITCH -> BRAKE WARNING LAMP SWITCHES -> COMBINATION VALVE -> COMPONENT DESCRIPTION -> Diagonally Split System -> Failure Warning Switch -> Fluid Level Sensor -> Front & Rear Split System -> Metering Valve -> Proportioning Or Pressure Control Valve -> SYSTEM OPERATION -> Testing Warning Lamp Operation
Vehicle: 1993 Buick Lesabre Custom 3.8 V6 GAS

SYSTEM OPERATION
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, Fig. .

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) brake system fails,...

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