1990 Audi 90 Quattro Brake Service (ONLINE REPAIR MANUALS)

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BRAKE SERVICE PROCEDURES FOR 1990 Audi 90 Quattro AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 Audi 90 Quattro cars and light trucks from 1990+.

AUDI, HYDRAULIC BRAKE SYSTEM -> CHECKING BRAKE SERVO OPERATING PRESSURE -> 1990-91 100/200
Vehicle: 1990 Audi 90 Quattro 20V 2.3 L5 GAS

1990-91 100/200

Refer to Fig. , when checking operating pressure.

  • 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 with hollow bolt and copper washers to brake servo unit. Attach thick copper washer between brake servo unit and banjo fitting and thin copper washer between hollow bolt and banjo fitting.
  • Start engine and let idle until pressure gauge reading exceeds 2030 psi.
  • If specified pressure is not reached, check delivery rat...

CLICK HERE TO GET FULL ACCESS TO 1990 Audi 90 Quattro BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1990 Audi 90 Quattro AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 Audi 90 Quattro cars and light trucks from 1990+.

AUDI, HYDRAULIC BRAKE SYSTEM -> PROPORTIONING VALVE, CHECKING -> 80/90
Vehicle: 1990 Audi 90 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 90 Quattro BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1990 Audi 90 Quattro AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 Audi 90 Quattro cars and light trucks from 1990+.

AUDI, POWER BRAKE UNITS -> BRAKE BOOSTER REPLACEMENT -> 80/90
Vehicle: 1990 Audi 90 Quattro 20V 2.3 L5 GAS

80/90

  • Remove master cylinder as previously described.
  • Disconnect vacuum line(s) from boost...

CLICK HERE TO GET FULL ACCESS TO 1990 Audi 90 Quattro BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1990 Audi 90 Quattro AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 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: 1990 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 1990 Audi 90 Quattro BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1990 Audi 90 Quattro AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 Audi 90 Quattro cars and light trucks from 1990+.

AUDI, ANTI-LOCK BRAKES -> DIAGNOSIS & TESTING -> HIGH & LOW PRESSURE CHECKING
Vehicle: 1990 Audi 90 Quattro 20V 2.3 L5 GAS

HIGH & LOW PRESSURE CHECKING

  • Remove bleeder screw from one front brake caliper.
  • Connect gauge set VW 1310 or equivalent, then bleed gauges.
  • Install brake pedal depressor, between brake pedal and driver's seat.
  • Load brake pedal until gauge reads 725 psi.
  • Watch gauge for 45 seconds....

CLICK HERE TO GET FULL ACCESS TO 1990 Audi 90 Quattro BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1990 Audi 90 Quattro AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1990 Audi 90 Quattro cars and light trucks from 1990+.

AUDI, DISC BRAKES -> Girling Single Piston w/Dual Mounting Bolts, Rear -> CALIPER OVERHAUL
Vehicle: 1990 Audi 90 Quattro 20V 2.3 L5 GAS

Refer to Fig. , when overhauling caliper.

  • Secure caliper in a suitable soft-jawed vise, then remove piston from bore by turning counterclockwise with a suitable allen wrench.
  • Pry piston seals from groove, being careful not to score the piston bore.
  • Slide outer dust boot o...

CLICK HERE TO GET FULL ACCESS TO 1990 Audi 90 Quattro BRAKE SERVICE PROCEDURES

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