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Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1994 Pontiac Firefly car and truck
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BRAKE SERVICE PROCEDURES FOR 1994 Pontiac Firefly AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1994 Pontiac Firefly 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: 1994 Pontiac Firefly 1.0 L3 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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BRAKE SERVICE PROCEDURES FOR 1994 Pontiac Firefly AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1994 Pontiac Firefly 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: 1994 Pontiac Firefly 1.0 L3 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...
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BRAKE SERVICE PROCEDURES FOR 1994 Pontiac Firefly AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1994 Pontiac Firefly cars and light trucks from 1990+.
Power Brake Units -> Troubleshooting -> AC-DELCO TANDEM DIAPHRAGM TYPE -> BCIA SINGLE & TANDEM DIAPHRAGM TYPE -> Brakes Drag -> Brakes Grab -> Brakes Slow To Release Or Drag -> Brakes Slow To Respond -> Excessive Pedal Effort -> Hard Pedal -> Hard Pedal/Brakes Inefficient -> Low Or Spongy Brake Pedal -> Slow Or No Release -> TOYOTA/GM SINGLE DIAPHRAGM TYPE
Vehicle: 1994 Pontiac Firefly 1.0 L3 GAS
AC-DELCO TANDEM DIAPHRAGM TYPE
Hard Pedal
- Internal vacuum leak.
- Faulty control valve.
Brakes Grab
- Faulty control valve.
Slow Or No Release
- Faulty pushrod adjustment.
- Bind in linkage.
BCIA SINGLE & TANDEM DIAPHRAGM TYPE
Brakes Grab
- Internal vacuum leak.
- Faulty control valve
Excessive Pedal Effort
- Leak in booster vacuum supply.
- Glazed linings.
- Contaminated brake fluid.
- Restricted filter or booster valve air passage.
- Leak in booster vacuum supply.
- Damaged booster or improperly assembled booster valve.
Brakes Slow To Respond
- Restricted filter or booster valve air passage.
- Contaminated brake fluid.
- Leak in...
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BRAKE SERVICE PROCEDURES FOR 1994 Pontiac Firefly AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1994 Pontiac Firefly cars and light trucks from 1990+.
Power Brake Units -> General Service
Vehicle: 1994 Pontiac Firefly 1.0 L3 GAS
Two basic types of power assist mechanisms are used: vacuum assist diaphragm assemblies, which use engine vacuum or, in some cases vacuum pressure developed by an external vacuum pump. The second type is a hydraulic pressure assist mechanism, which use pressure developed by an external pump (usually the power steering pump). Both systems act to increase the force exerted on the master cylinder piston by the operator. This in turn increases the hydraulic pressure delivered to the wheel cylinders, while decreasing driver effort necessary to obtain acceptable stopping performance.
V...
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BRAKE SERVICE PROCEDURES FOR 1994 Pontiac Firefly AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1994 Pontiac Firefly 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: 1994 Pontiac Firefly 1.0 L3 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 1994 Pontiac Firefly AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1994 Pontiac Firefly cars and light trucks from 1990+.
Hydraulic Brake Systems -> Component Service -> Assemble -> CORVETTE -> Disassemble -> EXCEPT CORVETTE -> MASTER CYLINDER OVERHAUL -> WHEEL CYLINDER OVERHAUL
Vehicle: 1994 Pontiac Firefly 1.0 L3 GAS
MASTER CYLINDER OVERHAUL
EXCEPT CORVETTE
Disassemble
Refer to Figs. and when performing the following procedures.
- Remove master cylinder from vehicle as follows:
- Disconnect and plug hydraulic lines.
- Remove two master cylinder attaching nuts, then the master cylinder.
- Remove reservoir cover and diaphragm. Discard old brake fluid in reservoir.
- Inspect cover and diaphragm. Replace if cut, cracked or deformed.
- Remove fluid level switch, if equipped.
- On models with compact master cylinder, remove proportioner valve assembly, Fig. .
- Depress primary piston and remove lock ring.
- Plug primary fl...
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