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


Back disk brakes

The same as on a forward axis, disk brakes of a back axis are so-called brakes with cam supports.

In addition to the hydraulic drive of a foot brake disk brakes of back wheels can be put in action also cables of the emergency brake. By means of the lever to which the brake cable is attached the brake piston nestles on a slip a pusher.

It is necessary to notice that brakes of back wheels in front-wheel and all-wheel drive models differ in type of hinged connection of a cable of the emergency brake, but for the rest it is about the same brakes.

Automatic adjustment

In cars automatic adjustment of disk brakes is structurally caused: in process of wear of a slip the brake piston just goes out farther of the case of a brake support and provides a constant prileganiye of slips to a brake disk. At the expense of the brake fluid flowing after it the gap is not formed.

Not so the situation is at mechanical control by the emergency brake: here the pusher of drafts of the emergency brake sometime will not get the piston which is far put forward outside if additional adjustment is not carried out. It "extends" a pusher depending on requirement.

Basis of adjustment is the carving on which the second detail unscrews in process of wear of slips forward – so the press device becomes longer. Therefore when replacing slips the brake piston cannot just be wrung out back, it needs to be screwed up on the adjusting mechanism.