Audi A4

since 1994 release

Repair and operation of the car

A4 Audi
+ 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 brake system
   So the brake system works
   Check of brakes
   Brake fluid
   Check of level of brake fluid
   Check of 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 brake system
   Pumping of 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 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

Check of a condition of brake disks

If forward wheels are removed for carrying out check of brake slips, also the condition of brake disks is at the same time checked.

On disks there should not be deep grooves (because of dirt or too strongly erased blocks). Grooves deeply crash into new brake slips that considerably reduces the term of their service and reduces brake effect.

The scratched brake disks can be ground on the lathe if they for long time of service were not erased to the admissible minimum size yet.

Too thin disks are replaced with couples.

The bluish shade of a brake disk does not matter.

Sizes of brake disks

Brake disks
Ahead not ventilated
Ahead with internal ventilation
Thickness of the new
Minimum thickness
15 mm
13 mm
25 mm
23 mm
10 mm
8 mm