1991 Pontiac Firefly Brake Service (ONLINE REPAIR MANUALS)

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We have info for following modifications of 1991 Pontiac Firefly

  • 1991 Pontiac Firefly 1.0 L3 GAS, CC:993, CID:61, Fuel Injection, Aspiration:61, Engine VIN:, Desg:2
  • 1991 Pontiac Firefly 1.0 L3 GAS, CC:993, CID:61, Fuel Injection, Aspiration:61, Engine VIN:, Desg:6
  • 1991 Pontiac Firefly LE 1.0 L3 GAS, CC:993, CID:61, Fuel Injection, Aspiration:61, Engine VIN:, Desg:6

BRAKE SERVICE PROCEDURES FOR 1991 Pontiac Firefly AUTOMOBILES

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

DISC BRAKES, GENERAL MOTORS -> General Information -> BRAKE DISC SERVICE
Vehicle: 1991 Pontiac Firefly LE 1.0 L3 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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BRAKE SERVICE PROCEDURES FOR 1991 Pontiac Firefly AUTOMOBILES

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

HYDRAULIC BRAKE SYSTEM, GENERAL MOTORS -> SYSTEM SERVICE -> BLEEDING BRAKES -> Flushing Hydraulic System -> Manual Bleeding -> Pressure Bleeding -> Wheel Bleeding Sequence
Vehicle: 1991 Pontiac Firefly LE 1.0 L3 GAS

BLEEDING BRAKES

Manual Bleeding

Pressure bleeding is recommended for all hydraulic systems. However, if a pressure bleeder is unavailable, use the following procedure.Brake fluid damages painted surfaces. Immediately clean any spilled fluid.

  • Remove vacuum reserve by pumping brakes several times with engine off.
  • Fill master cylinder reservoir with clean brake fluid. Check fluid level often during bleeding procedure; do not let reservoir fall below half full.
  • If necessary, bleed master cylinder as follows:
    • Disconnect master cylinder forward brake line connection until fluid flows from re...

CLICK HERE TO GET FULL ACCESS TO 1991 Pontiac Firefly BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1991 Pontiac Firefly AUTOMOBILES

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

DISC BRAKES, GENERAL MOTORS -> General Information -> BLEEDING DISC BRAKES
Vehicle: 1991 Pontiac Firefly 1.0 L3 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...

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BRAKE SERVICE PROCEDURES FOR 1991 Pontiac Firefly AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Pontiac Firefly 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 Pontiac Firefly 1.0 L3 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...

CLICK HERE TO GET FULL ACCESS TO 1991 Pontiac Firefly BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1991 Pontiac Firefly AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Pontiac Firefly 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 Pontiac Firefly 1.0 L3 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 ...

CLICK HERE TO GET FULL ACCESS TO 1991 Pontiac Firefly BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1991 Pontiac Firefly AUTOMOBILES

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

POWER BRAKE UNITS, GENERAL MOTORS -> DELCO-MORAINE SINGLE DIAPHRAGM TYPE -> Brakes Grab -> DESCRIPTION -> Hard Pedal -> OVERHAUL -> Slow Or No Release -> TROUBLESHOOTING
Vehicle: 1991 Pontiac Firefly LE 1.0 L3 GAS

DESCRIPTION

This power brake unit is a suspended type vacuum brake booster which utilizes engine intake manifold vacuum and atmospheric pressure to assist in braking,Fig. .

The unit consists of a vacuum power section and a hydraulic master cylinder section. The vacuum power section contains a power piston with rolling diaphragm mechanism and power piston return spring.

The control valve consists of an air valve and floating vacuum control valve assembly. The reaction mechanism consists of a hydraulic piston, reaction plate and a series of levers. The valve opera...

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