Audi A4

Since 1994 of release

Repair and car operation

Audi А4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ Exhaust system
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and channels всасывания
+ Injection system
+ Coupling
+ Transmission and the main transfer
+ Suspension bracket of wheels and steering
- Brakes
   Independent work on brake system
   So the brake system works
   Check of brakes
   Brake liquid
   Check of level of a brake liquid
   Check of brake system on tightness and presence of damages
   Replacement of a brake liquid
   Disk brakes
   Measurement of a 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
   Manual brake
   Check of idling of the lever of a manual brake
   The main brake cylinder
   The brake amplifier
   Check of the brake amplifier
   Works on hydraulics of brake system
   Prorolling 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)
   Infringements in system ABS work
   Electronic blocking of differential (EDS)
+ Wheels and tyres
+ The electrotechnical equipment
+ Ignition system
+ Illumination
+ The alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics

Electronic blocking of differential (EDS)

Electronic blocking of differential (Elektronische Differential-Sperre) does not work in the main transfer by means of mechanical перемыкания differential or by means of friction surfaces as it complicates a steering and movement on turns. The letter е in abbreviation EDS already speaks about electronics use – in a combination to antiblocking system:


  1. When in a start of motion the forward wheel about it learn gauges of number of turns on various value of frequency of rotation of wheels rotates.
  2. The combined block of management ABS and EDS puts in action a disk brake on a turned wheel. It is carried out at the expense of additional pair of electromagnetic valves in hydraulic module ABS. ABS opens connection from a pressure collector to the wheel cylinder of a corresponding disk brake until the wheel will not be braked so that other forward wheel can transfer effort.
  3. As soon as on both wheels there are identical conditions of proslipping, the management block finishes process of adjustment and closes electromagnetic valves. The driver does not need to interfere, he notices differential blocking only on change of character of noise.
  4. To exclude failure, EDS it is supervised by the blocking scheme. On the basis of pressure of brakes, and also after the established maximum period of time EDS it is disconnected to avoid an overload of brakes. For the speed over 40 km/h EDS it is disconnected always. Schemes of electromagnetic valves so are calculated that forward brakes cannot work without the control.
  5. If the management block distinguishes failure in work EDS EDS it is disconnected. The antiblocking system continues to function. In all cases Audi it is ready to braking at any time.
  6. The device of storing of malfunctions works the same as is described in section about ABS.