Audi A4 with 2001- 2005 of release.
1. Operation and car maintenance service
2. The engine
3. Transmission
4. A running gear
4.1. Wheels and tyres
4.1.1. The general information on wheels and tyres
4.1.2. Specifications for re-equipment of disks and tyres
4.1.3. Indexes of speed of tyres
4.1.4. Marks on disks
4.1.5. Compound disks
4.1.6. Deterioration and ходимость tyres
4.1.7. Deterioration of high-speed tyres
4.1.8. Service of tyres
4.1.9. In regular intervals worn out tyres
4.1.10. Measurement of height of drawing of a protector
4.1.11. Unilateral deterioration
4.1.12. Diagonal non-uniform deterioration
4.1.13. Noise качения tyres
4.1.14. Balancing
4.1.15. Radial and lateral palpation of wheels and tyres
4.1.16. Check of radial and lateral palpation of a disk with the tyre by means of the indicator of hour type for tyres V.A.G 1435
4.1.17. Minimisation
4.1.18. Lateral withdrawal of the car
4.1.19. Elimination of lateral withdrawal
4.1.20. Damages of tyres
4.1.21. A design of the radial tyre
4.1.22. Loss of pressure of air in tyres
4.1.23. Damages of tyres because of errors at mounting (assembly damages)
4.1.24. Marks sidewallsы tyres
4.1.25. Shift of wheels
4.1.26. Instructions on replacement and installation of wheels
4.1.27. Change of tyres
4.1.28. Removal and installation of the case of the metal gate
4.2. The general data on a car running gear
4.3. Repair of a suspension bracket of forward wheels
4.4. A back suspension bracket
4.5. Tables
5. The steering mechanism
6. Brake system
7. An onboard electric equipment
8. A body
9. Electric equipment schemes



4.1.22. Loss of pressure of air in tyres

To repair radial tyres with the steel cord, having skeleton damage by an extraneous subject, it is not recommended.
There can be a corrosion on a steel wire. It leads отслоению rubbers from a steel cord.
As a rule, to find out, when arrival on an extraneous subject has been made, it is impossible. Damage of a skeleton of the tyre because of driving with insufficient pressure in the tyre As a result can take place.
Damage проволок a cord leads sooner or later отслоению rubbers from a steel cord. In a consequence of it after a while, much later, than there was an initial damage, there can be a nonrestorable damage of the tyre.

Pressure of air in the tyre
Pressure of air in tyres is necessary for checking regularly. It is recommended to supervise pressure in tyres with periodicity of 14 days. It is necessary to give special attention to this question at trips on long distances or at congestion of the car. Sports style of driving also demands correct pressure in tyres or even slightly большего.

Slow спускание tyres
Slow спускание tyres is опсное the phenomenon as even skilled drivers do not notice more often it.
Because of insufficient pressure of air in the tyre and connected with it большей work of lateral deformation (an internal friction) tyre materials heat up so strongly that is not excluded отслаивание various elements of a skeleton and rubber mixes.
Final stage is completely destroyed tyre more often.
The reason slow спускания not always manages to be found out tyres, as as a result the tyre appears strongly damaged, and quite often there are no skeleton elements.

Growth of temperature of the tyre at insufficient pressure

Fig. 4.25. Change of temperature of the tyre at speed of 180 km/h

The schedule shows change of temperature of the tyre at speed of 180 km/h (fig. 4.25).
A – the Normal range. Bei Einhalten des vorgeschriebenen Luftdrucks bleibt die Temperatur im Gleichgewicht.
B – the Dangerous zone. At shortage of pressure of air 0,3 bar the temperature increases in the tyre from above 120 C at high speeds.
C – Critical temperature. Tyre damage begins.
T – Temperature in C.
t – driving Time in minutes.

4.1.21. A design of the radial tyre

4.1.23. Damages of tyres because of errors at mounting (assembly damages)