Audi A4

since 1994 release

Manual of the car

Audi A4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ System of an exhaust
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and channels of absorption
+ System of injection
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
- Brakes
   Independent work on the brake system
   So the brake system works
   Check of brakes
   Brake fluid
   Check of level of brake fluid
   Check of the brake system on tightness and existence of damages
   Replacement of brake fluid
   Disk brakes
   Measurement of thickness of overlays of forward disk brakes
   Check of a condition of brake disks
   Replacement of overlays of disk brakes
   Back disk brakes
   Measurement of overlays of back disk brakes
   Emergency brake
   Check of idling of the lever of the emergency brake
   Main brake cylinder
   Brake amplifier
   Check of the brake amplifier
   Works on hydraulics of the brake system
   Pumping of the brake system
   The help at malfunctions
   ABS and EDS
   What does ABS?
   Function of separate knots
   Electronic system of distribution of brake effort (EBV)
   Violations in work of the ABS system
   Electronic blocking of differential (EDS)
+ Wheels and tires
+ Electrotechnical equipment
+ System of ignition
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics


Measurement of thickness of overlays of forward disk brakes

Large brake overlays of forward disk brakes often maintain a run more than 50 000 km. Control of thickness of slips is of great importance for safety, – easily "forget" about brakes, in view of such high hodimost of slips, – as in Audi A4 is not present to more alarm bulb of wear of brake slips as it was in the previous models:

Measurement of a brake slip on brakes of a forward wheel:

1 – slip material;
2 – the bearing plate from metal.


  1. The minimum thickness of a slip makes 7 mm, including the bearing plate. The bearing plate – a metal detail on which the slip is pasted – has thickness about 5 mm, at the same time material of a direct slip has to have the minimum thickness of 2 mm.
  2. At fluent control with the taken-off cap of a wheel light a lamp in an opening of a rim and estimate slip thickness.
  3. More exact control at the removed wheel.
  4. Apply a ruler to a slip and measure, do not forget about a brake slip on inside!