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Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1991 Buick Riviera car and truck
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BRAKE SERVICE PROCEDURES FOR 1991 Buick Riviera AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Buick Riviera cars and light trucks from 1990+.
ANTI-LOCK BRAKES, GENERAL MOTORS -> 1991 Caprice, Custom Cruiser, Eldorado, Reatta, Riviera, Roadmaster, Seville, Toronado & Trofeo (Bosch 2 U Type) -> SYSTEM COMPONENTS -> ABS VALVE RELAY & PUMP RELAY -> Caprice, Customer Cruiser and Roadmaster -> Eldorado, Reatta, Riviera, SeVille, Toronado & Trofeo -> ELECTRONIC BRAKE CONTROL MODULE (EBCM) -> HYDRAULIC MODULATOR VALVE -> OVERVOLTAGE PROTECTION RELAY (OVP) -> PUMP MOTOR -> SOLENOID VALVES -> WHEEL SPEED SENSORS
Vehicle: 1991 Buick Riviera 3.8 V6 GAS
ELECTRONIC BRAKE CONTROL MODULE (EBCM)
The EBCM is a small control computer located under the trim panel on the left-hand side of passenger compartment on wagon models and on the left hand side of the luggage compartment on sedan models. This computer monitors the speed of each wheel and the electrical status of the hydraulic modulator. The primary functions of the EBCM are to detect wheel locking, control the brake system while in anti-lock mode and monitor the system for correct electrical operation. The EBCM also controls the display of the ABS diagnostic codes. If the EBCM ...
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BRAKE SERVICE PROCEDURES FOR 1991 Buick Riviera AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Buick Riviera 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: 1991 Buick Riviera 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 1991 Buick Riviera AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Buick Riviera cars and light trucks from 1990+.
POWER BRAKE UNITS, GENERAL MOTORS -> TOYOTA/GM SINGLE DIAPHRAGM TYPE -> ADJUSTMENTS -> Assembly -> Booster Pushrod -> Brake Pedal -> Brakes Drag -> Brakes Grab -> Disassembly -> Hard Pedal/Brakes Inefficient -> Low Or Spongy Brake Pedal -> OVERHAUL -> TROUBLESHOOTING
Vehicle: 1991 Buick Riviera 3.8 V6 GAS
ADJUSTMENTS
Brake Pedal
- 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...
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BRAKE SERVICE PROCEDURES FOR 1991 Buick Riviera AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Buick Riviera cars and light trucks from 1990+.
ANTI-LOCK BRAKES, GENERAL MOTORS -> 1991 Caprice, Custom Cruiser, Eldorado, Reatta, Riviera, Roadmaster, Seville, Toronado & Trofeo (Bosch 2 U Type) -> DIAGNOSIS & TESTING -> Caprice, Custom Cruiser and Roadmaster -> CLEARING CODES -> DIAGNOSTIC LINE PROCEDURE -> Eldorado, Reatta, Riviera, SeVille, Toronado and Trofeo -> FLASH CODE DIAGNOSIS -> IGNITION CYCLE DEFAULT -> INTERMITTENTS -> MODE F0: Data List -> Mode F1: Code History -> Mode F2: Trouble Codes -> Mode F3: ABS Snapshot -> Mode F4: ABS Tests -> TECH 1 DIAGNOSTICS -> TECH 1 PROCEDURE -> TECH 1 TEST MODES
Vehicle: 1991 Buick Riviera 3.8 V6 GAS
When a malfunction occurs in the ABS system, the EBCM will activate the amber Anti-Lock Warning Lamp. Before performing diagnosis on the ABS system when the warning lamp comes on, check that the EBCM connector and all other system electrical connectors are secure and that fuses are satisfactory. Refer to Figs. and for the ABS system functional check. Sometimes use of the compact spare will activate a wheel sensor fault code and deactivate the ABS system, if this occurs, recycle the ignition switch to reset the system.
There are either thirteen or fifteen trouble codes that ...
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BRAKE SERVICE PROCEDURES FOR 1991 Buick Riviera AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Buick Riviera cars and light trucks from 1990+.
DISC BRAKES, GENERAL MOTORS -> General Information -> BLEEDING DISC BRAKES
Vehicle: 1991 Buick Riviera 3.8 V6 GAS
Pressure bleeding is recommended for all hydraulic disc brake systems.
The disc brake hydraulic system can be bled manually or with pressure bleeding equipment. On vehicles with disc brakes the brake pedal will require more pumping and frequent checking of fluid level in master cylinder during bleeding ope...
CLICK HERE TO GET FULL ACCESS TO 1991 Buick Riviera BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 Buick Riviera AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Buick Riviera cars and light trucks from 1990+.
DISC BRAKES, GENERAL MOTORS -> General Information -> BRAKE DISC SERVICE
Vehicle: 1991 Buick Riviera 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...
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