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

Check of brake system on tightness and presence of damages

At carrying out of check the car bottom should be dry that it was possible to see not tight sites. The brake liquid spreads also under a dirt. Dark places from dampness can be signs of infringement of tightness.


  1. Check up all connecting knots and connection points, and also brake supports.
  2. Brake hoses should not be damp, bulked up or erased. Otherwise – replace.
  3. Brake tubes are covered by the protective layer protecting from a rust. If this layer is damaged, it can lead to rust occurrence. Therefore never clean pipes a screw-driver, an emery paper or a wire brush, use an old rag.
  4. If the protective layer is damaged, on the bared places it is necessary to apply a thin film an anticorrosive first coat.
  5. With flows of a rust or flattened it is necessary to replace tubes.
  6. On all unions of prorolling there are protective caps? They are above on supports.
  7. You can temporarily inspect pressure in brake system:
  8. Up to the end wring out a brake pedal.
  9. It should not give in even after several minutes of full loading, if it not so the cuff in the main brake cylinder is defective.
  10. Because of not tight cuff level of a brake liquid in a tank does not go down, the liquid under pressure squeezes by the piston of the main brake cylinder on that party where there is no pressure.
  11. Not tight sites on cuffs of pistons of brake supports are distinguished on dark stains on brake supports.
  12. In a doubtful case address in a workshop.