Audi A4

since 1994 of release

Repair and car operation



A4 Audi
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ exhaust System
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and absorption channels
+ injection System
+ 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 liquid
   Check of level of brake liquid
   Check of brake system on tightness and existence of damages
   Replacement of brake liquid
   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
   Hand brake
   Check of idling of the lever of the hand 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 ABS system work
   Electronic blocking of differential (EDS)
+ Wheels and tires
+ Electrotechnical equipment
+ ignition System
+ Lighting
+ 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 force out the brake liquid concluded there. The pressure which was formed thus in brake system via pipelines and hoses is transferred to cylinders of brakes.
  • In them pistons press brake shoes to brake disks.
  • Pressure of 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 double-circuit brake system divided on a diagonal).
  • If one brake contour, that, despite it fails, two wheels are still braked.
  • The hand brake affects back wheels with means of hummock drafts and a mechanical way presses slips to brake disks.
  • All Audi A4 models since the beginning of release of a series have serial system of anti-blocking of wheels. In more detail about ABS it is told in the following chapter.

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