﻿ Audi A4, User manual and to repair - The brake amplifier//Audi A4 since 1994 / Audi-A4-b5

Audi A4

since 1994 release

Manual of the car

Audi A4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ System of an exhaust
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and channels of absorption
+ System of injection
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
- Brakes
   Independent work on the brake system
   So the brake system works
   Check of brakes
   Brake fluid
   Check of level of brake fluid
   Check of the brake system on tightness and existence of damages
   Replacement of brake fluid
   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
   Emergency brake
   Check of idling of the lever of the emergency brake
   Main brake cylinder
   Brake amplifier
   Check of the brake amplifier
   Works on hydraulics of the brake system
   Pumping of the 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 work of the ABS system
   Electronic blocking of differential (EDS)
+ Wheels and tires
+ Electrotechnical equipment
+ System of ignition
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics


Brake amplifier

The auxiliary effort is provided at the expense of the lowered pressure in an inlet collector. The brake amplifier is connected with an inlet collector a hose. When braking the difference between the atmospheric pressure and the lowered pressure in an inlet collector displaces a big elastic membrane and puts the additional pressure upon pistons in the main brake cylinder. If the engine does not work, the servoupravleniye cannot develop (additional) brake effort too. If on the way the engine suddenly stops, then at you some reserve for several braking still remains. But after that gastrocnemius muscles have to work at full capacity.