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

Works on hydraulics of brake system


  1. The brake liquid is poisonous. Therefore touch it with a mouth or open wounds.
  2. The brake liquid corrodes an automobile varnish. Therefore do not put on varnishing the rags impregnated with a brake liquid, or the tools soiled in it.
  3. At easing of a brake hose or a brake tube the brake liquid gradually follows from a broad tank. Do not suppose it as follows: before easing of screw connection in a corresponding brake contour ослабьте the prorolling screw. Put on a hose of prorolling and lower it in capacity. Completely wring out a pedal of a brake and fix it in this position by means of a wooden plate. It will close apertures of giving of a liquid in main brake the cylinder and the brake liquid will not pour out any more.
  4. For unscrewing and a tightening of brake tubes you should buy the shown key for brake tubes
  5. For отжима in an opposite direction of brake hoses to you it is necessary рожковый a key.
  6. After the works spent in hydraulics of brake system, it is necessary to pump over it always. Often happens sufficient to pump over only that brake contour on which work was spent.

Dismantle of brake tubes


  1. Unscrew накидную a nut of a brake tube. Reliably keep opposite connection, for example, on the end of a brake hose.
  2. If the nut on a tube has rusted and does not rotate, in any case the tube needs to be changed. Thin-walled tubes quickly break off.
  3. For unscrewing of connecting knots of tubes the following council can help in the event that in any case it is necessary to replace the given piece of a tube:
  4. Saw off a brake tube near to screw connection, unscrew накидную a nut a key of type "nutlet" with шестигранником.
  5. Lay brake tubes in intended for them распорные arms.

Dismantle of brake hoses


  1. In the beginning unscrew накидную a nut of a corresponding brake hose. Thus watch that the hose was not overwound.
  2. If the brake hose is attached to a body by a metal arm then it is fixed by a metal collar in order to avoid shifts. At assemblage do not forget about this so-called arm of a hose.
  3. At installation always in the beginning screw a hose in that place where it has an external carving.
  4. Then tighten other screw connection.
  5. The brake hose should not be overwound. As the control the colour strip or the rubber platen along a hose serves.
  6. Pump over brake system.
  7. Right after repair check up, whether the hose will rub somewhere at amortisation movements.
  8. Repeat this check after a long trip.