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



So the brake system works

  • When you press a brake pedal the pusher connected with a pedal presses two pistons located one after another into the main brake cylinder (in an impellent compartment).
  • Pistons supersede the brake liquid concluded there. Pressure formed thus in brake system through pipelines and hoses is transferred to cylinders of brakes.
  • In them pistons press brake Pads to brake disks.
  • Pressure of a liquid is transferred by two systems of pipelines independent from each other (brake contours), and for one forward wheel and an opposite back wheel (the two-planimetric brake system divided on a diagonal).
  • If one brake contour, that, despite it fails, two wheels are still braked.
  • The manual brake operates on back wheels by means of тросовых draughts and a mechanical way presses overlays to brake disks.
  • All models Audi A4 from the beginning of release of a series have serial system of antiblocking of wheels. In more details about ABS it is told in the following chapter.

 Council: If one brake contour you should press on a pedal of a brake much more strongly (a free wheeling of a pedal of a brake also fails becomes longer) to achieve brake effect. The braking way too is extended.