Service of Audi A4 from 2001 to 2005 release.
1. Operation and maintenance of the car
2. Engine
3. Transmission
4. Running gear
4.1. Wheels and tires
4.1.1. General information on wheels and tires
4.1.2. Specifications for re-equipment of disks and tires
4.1.3. Indexes of speed of tires
4.1.4. Marking on disks
4.1.5. Compound disks
4.1.6. Wear and hodimost of tires
4.1.7. Wear of high-speed tires
4.1.8. Service of tires
4.1.9. Evenly worn-out tires
4.1.10. Measurement of height of the drawing of a protector
4.1.11. Unilateral wear
4.1.12. Diagonal uneven wear
4.1.13. Noise of swing of tires
4.1.14. Balancing
4.1.15. Radial and side beating of wheels and tires
4.1.16. Check of a radial and side beating of a disk with the tire by means of the indicator of hour type for tires V.A.G 1435
4.1.17. Minimization
4.1.18. Side withdrawal of the car
4.1.19. Elimination of side withdrawal
4.1.20. Damages of tires
4.1.21. Design of the radial tire
4.1.22. Loss of pressure of air in tires
4.1.23. Damages of tires because of mistakes when mounting (assembly damages)
4.1.24. Marking of a sidewall of the tire
4.1.25. Shift of wheels
4.1.26. Instructions on replacement and installation of wheels
4.1.27. Change of tires
4.1.28. Removal and installation of the case of the metal gate
4.2. General information about a running gear of the car
4.3. Repair of a suspension bracket of forward wheels
4.4. Back suspension bracket
4.5. Tables
5. Steering mechanism
6. Brake system
7. Onboard electric equipment
8. Body
9. Schemes of electric equipment


4.1.23. Damages of tires because of mistakes when mounting (assembly damages)

The core of a board exploded at a tire rating

Fig. 4.26. The scheme of installation of the tire on a disk: 1 – хамп (double хамп H 2); 2 – onboard zakraina of a rim; 3 – internal shoulder of a rim (e.g. conic shelf); 4 – rim; 5 – disk; 6 – cavity; 7 – external shoulder of a rim (e.g. conic shelf)

Modern radial tires for cars are mounted only on safe disks. Their rims have on shoulders an eminence 1 on all circle (fig. 4.26).
Hamp protects the tire when driving with the low pressure of air in it from sliding from a rim shoulder.
At a rating of the tire can happen that the tire board not completely will move through an external hamp of a rim.
In this case there is a danger of an excessive extension of the core of a board with too high pressure therefore its steel threads will become torn partially or completely. The rupture of the core of a board is imperceptible outside.

Tires with the damaged board core leaky sit on a disk rim. Such tires are extremely unsafe at operation.
Besides, there is a danger that the torn board core in the movement will explode completely, and the tire will suddenly explode. At a rupture of the core of a board at a tire rating the framework also collapses.

The tire with the broken-off core of a board and the destroyed framework

Fig. 4.27. The tire with the broken-off core

In the figure 4.27 the tire with the broken-off core and the destroyed framework as a result of excessive stretching at installation is represented.
Damages of a board because of wrong or wrong mounting at the tire stand
The following mistakes when mounting can lead to serious damages of tires:
– if at roll-in of the top board at the tire stand the opposite board of the tire not completely lies in a cavity;
– if the assembly head was incorrectly adjusted;
– if the edge of an assembly roller slides on an onboard roller;
– in the presence of worn-out or sharp guides of rollers.

Tires with a board cut

Fig. 4.28. Tires with a board cut

In such cases the board which is under high voltage can be made an incision, cut and/or jammed to a wire of the core (fig. 4.28).
Often in a zone of damage traces of the beginning and end of contact with the directing roller are visible.

Essentially both boards of the tire and shoulders of a rim need to be greased with tire paste.
If damages at installation remain unnoticed, there is a danger of destruction of the tire at its further operation.
Never mount the tire without tire paste.
Do not pump up an explosive rating over 3 bars.
Do not pump up the tire over 4 bars.
At the end of mounting lower air pressure in the tire to the ordered value.

4.1.22. Loss of pressure of air in tires

4.1.24. Marking of a sidewall of the tire