Auto Parts Search
Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1991 Audi 90 Quattro car and truck
repair procedures including Audi engine diagrams, wiring diagrams, repair work estimating measures, technical service bulletins, auto body work
guidance, starter & alternator replacement procedures, serpentine belt replacement procedures, radiator & hose replacement procedures, tune-up &
drivability specifications, quick lube illustrations, preventive maintenance guide, engine light reset instructions, parts removal and install
procedures, fuel filter replacement directions, component location diagrams, air filter locations & replacement instructions, a/c
system specifications, and general auto service procedures. You don't have to be a car mechanic or technician to know how to fix
your 1991 Audi 90 Quattro automobile. Try the Automotix DIY solution today!
BRAKE SERVICE PROCEDURES FOR 1991 Audi 90 Quattro AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Audi 90 Quattro cars and light trucks from 1990+.
AUDI, POWER BRAKE UNITS -> CHECKING PRESSURE ACCUMULATOR PRESSURE RELIEF VALVE -> 100/200
Vehicle: 1991 Audi 90 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...
CLICK HERE TO GET FULL ACCESS TO 1991 Audi 90 Quattro BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 Audi 90 Quattro AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Audi 90 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: 1991 Audi 90 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 1991 Audi 90 Quattro BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 Audi 90 Quattro AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Audi 90 Quattro cars and light trucks from 1990+.
AUDI, HYDRAULIC BRAKE SYSTEM -> HEIGHT SENSITIVE BRAKE PRESSURE REGULATOR -> 80/90 -> ADJUSTING -> CHECKING -> PRESSURE CHECK
Vehicle: 1991 Audi 90 Quattro 20V 2.3 L5 GAS
CHECKING
80/90
Brake pressure regulator is mounted on right rear of body and operated by spring attached to rear axle. Test must be conducted with empty vehicle, full fuel tank and driver's seat occupied.
- Firmly depress pedal once (vehicle must be on ground).
- Release pedal suddenly and ensure lever on pressure regulator moves.
PRESSURE CHECK
80/90
- Ensure brake system is properly filled and bled.
- Connect gauge assembly US 1016 or equivalent, to left front and right rear calipers, according to manufacturer's instructions.
- On 90 models, bounce vehicle several times...
CLICK HERE TO GET FULL ACCESS TO 1991 Audi 90 Quattro BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 Audi 90 Quattro AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Audi 90 Quattro cars and light trucks from 1990+.
AUDI, DISC BRAKES -> Tightening Specifications
Vehicle: 1991 Audi 90 Quattro 20V 2.3 L5 GAS
CLICK HERE TO GET FULL ACCESS TO 1991 Audi 90 Quattro BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 Audi 90 Quattro AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Audi 90 Quattro cars and light trucks from 1990+.
AUDI, DISC BRAKES -> Teves Single Piston w/Dual Mounting Bolts, Front -> CALIPER OVERHAUL
Vehicle: 1991 Audi 90 Quattro 20V 2.3 L5 GAS
Refer to Fig. , when overhauling caliper.
Refer to "... "
CLICK HERE TO GET FULL ACCESS TO 1991 Audi 90 Quattro BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 Audi 90 Quattro AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Audi 90 Quattro cars and light trucks from 1990+.
AUDI, DISC BRAKES -> Teves Single Piston w/Dual Mounting Bolts, Front -> BRAKE PADS REPLACEMENT -> 100 -> 80/90
Vehicle: 1991 Audi 90 Quattro 20V 2.3 L5 GAS
80/90
- Raise and support vehicle, then remove front wheels.
- Remove guide pin cap, then lower guide pin using a suitable allen wrench.
- Remove brake hose clip from bracket on wheel bearing housing.
- Swing caliper upward, remove brake pads, then ensure heat shield is in correct position in piston.
- Push piston back into caliper housing. Always remove some brake fluid from master cylinder reservoir prior to installing new pads. When caliper piston is pushed back, fluid is forced out of caliper and into reservoir. After pads are installed, refill reservoir to MAX mark.
- Install brake pa...
CLICK HERE TO GET FULL ACCESS TO 1991 Audi 90 Quattro BRAKE SERVICE PROCEDURES
Shop online for auto body parts, engines, wheels, lights...
| More parts |
| Get the Complete Technical Service Bulletins! |
 Access diagrams and repair information such as wiring diagrams,
diagnosis and repair charts, manufacturer
service bulletins, and OEM Part
numbers of your 1991 Audi 90 Quattro vehicle.
|
| Access the Complete guide! |
