1990 Audi Coupe Quattro Brake Service (ONLINE REPAIR MANUALS)

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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 CHECK VALVE -> 100/200
Vehicle: 1990 Audi Coupe Quattro 20V 2.3 L5 GAS

100/200

  • 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 ser...

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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 -> 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, HYDRAULIC BRAKE SYSTEM -> MASTER CYLINDER REPLACEMENT
Vehicle: 1990 Audi Coupe Quattro 20V 2.3 L5 GAS

Refer to Figs. through , when replacing master cylinder.

  • Disconnect brake lines from master cylinder.
  • 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, DISC BRAKES -> Girling Single Piston w/Dual Mounting Bolts, Rear -> CALIPER OVERHAUL
Vehicle: 1990 Audi Coupe 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 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, DISC BRAKES -> Girling Single Piston w/Dual Mounting Bolts, Rear -> REAR BRAKE CALIPER, PRE-BLEEDING
Vehicle: 1990 Audi Coupe Quattro 20V 2.3 L5 GAS

  • Place caliper so that piston bore is facing down.
  • Open bleeder valve, then connect...

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...

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