Audi 80/90/Coupe

since 1986-1991 release

Repair and operation of the car


Audi 80/90/Coupe
+ 1.2. Identification of the car
+ 2. Engines, carburetors
3. Lubrication system
+ 4. Cooling system
+ 5. Fuel system
+ 6. Exhaust system
+ 7. System of ignition
+ 8. Transmission
+ 9. Suspension brackets, wheels
- 10. Brake system
   10.1.2. Brake shoes of forward brakes
   10.1.3. Brake shoes of back brakes
   10.1.4. General adjustment of back brakes (Girling)
   10.1.5. Replacement of brake shoes (all-wheel drive models)
   10.1.6. General adjustment of back brakes (Girling) (all-wheel drive models)
   10.1.7. Forks of pedals of a brake and coupling
   10.1.8. Adjustment of the emergency brake
   10.1.9. Removal of the lever of the emergency brake
   + 10.2. Hydraulic components
   - 10.3. Anti-blocking system of brakes
      10.3.2. Hydraulic pump
      10.3.3. Electronic control unit
      + 10.3.4. ABS elements of a forward wheel
      + 10.3.5. ABS elements of back brakes
      10.3.6. General comments on repair
+ 11. Steering
+ 12. Body, salon
+ 13. Air conditioning system
+ 14. Electric equipment


10.3.6. General comments on repair
GENERAL INFORMATION
Prevention

Switch off ignition before connecting or disconnecting the socket of connection of the ABS control unit
PERFORMANCE ORDER
1) disconnect the socket of connection of the ABS control unit before use of electric welding for car repairs
2) disconnect the accumulator before its charging or replacement of the hydraulic modulator
3) remove the ABS control unit before the room of the car in a drying cabinet after painting if temperature in it exceeds 85 °C more than 2 hours

Do not install the mini-tire on cars with ABS. Use wheels and tires of the required size on cars with ABS. Do not operate the car with the connected ABS tester.

Precautionary measures

After carrying out any repair over any of the following elements:

 – hydraulic modulator;
 – ABS control unit;
 – sensors of speed of rotation of wheels;
 – ABS wires;
 – it is necessary to carry out the full procedure of check of ABS, using a tester of ABS 2-LED.

Also, it is necessary to carry out an inspection of ABS after replacement of brake tubes or regulators of pressure in the brake system which were damaged.

After repair of the brake system which did not affect the ABS elements it is necessary to carry out the ABS following operational tests:

 – include ignition;
 – the alarm bulb of ABS has to light up;
 – pass on the car with the switched-off blocking of differential with a speed over 6 km/h;
 – the alarm bulb of ABS should not light up.

Carry out this test after repair / replacement of the following elements:

 – brake shoes and / or brake disks;
 – brake hoses;
 – servo-driver of the brake system or main brake cylinder;
 – ropes of the brake system and elements of the emergency brake.

At the last tests, check that ABS joined at least at one of ways of braking.