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Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1990 Audi Coupe Quattro car and truck
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BRAKE SERVICE PROCEDURES FOR 1990 Audi Coupe Quattro AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 Audi Coupe Quattro cars and light trucks from 1990+.
AUDI, POWER BRAKE UNITS -> CHECKING PRESSURE ACCUMULATOR PRESSURE RELIEF VALVE -> 100/200
Vehicle: 1990 Audi Coupe Quattro 20V 2.3 L5 GAS
100/200
- Ensure pump delivery rate is within specifications. Refer to "Checking Brake Servo Operating Pressure," step 5.
- With engine off, depress brake pedal approximately 20 times to reduce system pressure.
- Disconnect warning light switch electrical connector, then remove switch.
- Attach pressure gauge wit...
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BRAKE SERVICE PROCEDURES FOR 1990 Audi Coupe Quattro AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 Audi Coupe Quattro cars and light trucks from 1990+.
AUDI, HYDRAULIC BRAKE SYSTEM -> SYSTEM SERVICE -> 100/200 -> BLEEDING BRAKES -> Coupe Quattro & 80/90 -> V8 & 100/200 Quattro Models
Vehicle: 1990 Audi Coupe Quattro 20V 2.3 L5 GAS
BLEEDING BRAKES
100/200
To bleed brake system, use bottle with a transparent hose attached so that brake fluid can be checked for air bubbles.
- Bleed brakes in following sequence:
- Right rear caliper, left rear caliper, right front caliper, then left front caliper.
- After bleeding, fill reservoir to maximum mark.
V8 & 100/200 Quattro Models
To bleed brake system, use bottle with a transparent hose attached so that brake fluid can be checked for air bubbles.
- Connect brake filling and bleeding tool US 1116 or equivalent per manufacturers instructions.
- Bleed brakes in following sequence:
- Right r...
CLICK HERE TO GET FULL ACCESS TO 1990 Audi Coupe Quattro BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1990 Audi Coupe Quattro AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 Audi Coupe Quattro cars and light trucks from 1990+.
AUDI, HYDRAULIC BRAKE SYSTEM -> BRAKE PRESSURE REGULATOR -> 100/200 Quattro Models -> 1990-91 100 -> 1990-91 100/200 -> 1992 100 -> ADJUSTING -> CHECKING -> V8 Quattro
Vehicle: 1990 Audi Coupe Quattro 20V 2.3 L5 GAS
CHECKING
1990-91 100/200
Brake pressure regulator is mounted on body (left rear), and operated by a spring attached to the rear axle.
- Firmly depress brake pedal once, with car on the ground.
- Release pedal suddenly and ensure lever on pressure regulator moves.
- Raise and support vehicle to remove load from rear axle.
- Press brake pressure regulator lever toward rear.
- Loosen nut from front of spring, then attach spring, without play or tension, to plastic roller.
- Torque nut to 18 ft. lbs.
1992 100
Brake pressure regulator is mounted on body (left rear), and operated by a spring attac...
CLICK HERE TO GET FULL ACCESS TO 1990 Audi Coupe Quattro BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1990 Audi Coupe Quattro AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 Audi Coupe Quattro cars and light trucks from 1990+.
AUDI, HYDRAULIC BRAKE SYSTEM -> PROPORTIONING VALVE, CHECKING -> 80/90
Vehicle: 1990 Audi Coupe Quattro 20V 2.3 L5 GAS
80/90
The proportioning valve is located under the brake booster.
- Lift vehicle, then attach VW 1310 or equivalent, to left front and left rear brake calipers, then bleed gauges.
- Depress brake pedal until gauge on front caliper reads 725 psi. G...
CLICK HERE TO GET FULL ACCESS TO 1990 Audi Coupe Quattro BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1990 Audi Coupe Quattro AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 Audi Coupe Quattro cars and light trucks from 1990+.
AUDI, ANTI-LOCK BRAKES -> COMPONENT REPLACEMENT -> 1990-91 100/200 -> 1992 100 -> ACCELERATION SWITCH -> COMBINATION RELAY -> Coupe Quattro & 80/90 -> ELECTRONIC CONTROL UNIT -> FRONT WHEEL SPEED SENSORS -> INSTRUMENT CLUSTER RELAY -> REAR WHEEL SPEED SENSORS -> V8 Quattro -> V8 Quattro & 100/200
Vehicle: 1990 Audi Coupe Quattro 20V 2.3 L5 GAS
ELECTRONIC CONTROL UNIT
The electronic control unit is located beneath the lefthand side of the rear seat.
- Turn ignition switch to the Off position.
- Remove rear seat.
- Remove spring retaining electrical connector, then disconnect electrical connector.
- Remove screws securing control unit.
- Reverse procedure to install.
COMBINATION RELAY
Coupe Quattro & 80/90
Relay is located under instrument panel in auxiliary relay panel, position 1. Ensure ignition switch is in Off position prior to removal or installation.
1990-91 100/200
Relay is located at lefthand kick panel in auxiliary relay pan...
CLICK HERE TO GET FULL ACCESS TO 1990 Audi Coupe Quattro BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1990 Audi Coupe Quattro AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 Audi Coupe Quattro cars and light trucks from 1990+.
AUDI, ANTI-LOCK BRAKES -> TROUBLESHOOTING -> ABS RETURN PUMP DOES NOT RUN, RELAY GOOD, TESTER IN POSITION 3 -> ABS RETURN PUMP DOES NOT RUN, TESTER IN POSITION 3 -> LED 1 & 3 DO NOT LIGHT, TESTER IN POSITION 1 -> LED 13 DOES NOT LIGHT -> LED 19 DOES NOT LIGHT -> LED 2 DOES NOT LIGHT -> LED 35 DOES NOT LIGHT -> LED 4 DOES NOT LIGHT, TESTER IN POSITION 1 -> LED 4, 2, 35, 18 & 19 DO NOT LIGHT, TESTER IN POSITION 1 -> LED FOR ALTERNATOR DOES NOT GO OUT WHEN ENGINE STARTS -> LED FOR ALTERNATOR DOES NOT LIGHT, TESTER IN POSITION 2 -> LED FOR BRAKES DOES NOT GO OUT WHEN BRAKE PEDAL IS DEPRESSED -> LED FOR BRAKES DOES NOT LIGHT -> NO RESPONSE FROM SELECTED SENSOR, TESTER IN POSITION 6 -> POWER SUPPLY -> SENSOR SIGNAL ON METER BELOW MINIMUM VALUE -> Solenoid Valve Relay Check -> WRONG SOLENOID VALVE OPERATES, TESTER IN POSITION 5
Vehicle: 1990 Audi Coupe Quattro 20V 2.3 L5 GAS
The Bosch ABS 2 LED-Tester or an equivalent Must be used during test procedures. Connect tester per manufacturers instructions.
POWER SUPPLY
- Check battery for full charge.
- Check that fuses 3, 12 and anti-lock brake power supply relay fuses are satisfactory. The anti-lock brake power supply relay fuse is located on top of the power supply relay.
- Check for continuity between ABS control unit connector terminal 13 and ground, at battery ground cable. Fig. .
- Turn ignition switch to the Off position.
- Check for continuity between ABS control unit connector terminal 10 and ground.
- Check for b...
CLICK HERE TO GET FULL ACCESS TO 1990 Audi Coupe Quattro BRAKE SERVICE PROCEDURES
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