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


The help at malfunctions

Its reasons
Your help
A. Brakes pull on the one hand 1. Pressure in tires unequal
2. The drawing of a protector is erased unevenly
3. Are polluted, slips "glazed over" or are unevenly erased
4. Guides of slips in a brake support are polluted or rusted
5. Rusted pistons in brake supports or in wheel brake cylinders
6. Brake disks are strongly scratched or too thin
7. Brake hoses inflated from within
Level at cold tires
Change tires


Restore a free wheeling or replace

Replace brake disks

Replace hoses

B. Brakes squeal 1. Not those slips are established
2. Dust or dirt on disk brakes or in drum brakes
3. See. And 4–6
Establish original slips
Dismantle slips (block), remove dust and dirt
C. Brakes roar 1. In a brake disk a dent
2. The brake disk is strongly scratched
D. One or all brakes of wheels strongly heat up 1. The compensating opening in the main brake cylinder got littered
2. There is no gap between a brake pedal (press a rod) and pistons of the main brake cylinder
3. Brake supports rusted
4. The emergency brake is not completely switched-off


Repair in a workshop
Check brake cables and brakes of back wheels

E. Too big reserve of the course of a pedal, a pedal is wrung out softly and springs

1. Air in the brake system
2. The brake system is untight
3. The main brake cylinder is faulty
4. At strong load of brakes vials of steam in too old brake fluid are formed
5. See. And 5
Pump over the brake system
Carry out an inspection of system on tightness
Replace brake fluid
F. Bad effect of braking by strong pressing a pedal 1. Normal free wheeling of a pedal: slips were made oily or "zasteklenet"
2. Short free wheeling of a pedal: the brake amplifier is faulty
3. Long free wheeling of a pedal: one brake contour owing to tightness violation failed


Check, replace the damaged details

G. Unilateral or weak brake effect of the emergency brake 1. See points in And
2. The brake cable rusted
3. The adjusting mechanism is faulty