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



4.1.14. Balancing

Before to start balancing following conditions should be satisfied.
Pressure of air in the tyre should be in norm.
Protector drawing should not have unilateral deterioration, and its depth should make not less than 4 mm.
The tyre should not have any damages, like cuts, the punctures, extraneous subjects, etc.
The wheel suspension bracket, steering, steering draughts, including shock-absorbers, should be in a faultless condition.

Trial trip before balancing
If on the authorised station the car with the complaint on неплавность a course before balancing necessarily follows arrives execute a trial trip.
In movement it is necessary to establish, on what speed there is a disbalance.
At once after a trial trip lift the car on the lift.
Mark on each tyre a place of its installation.
Dismantle and отбалансируйте wheels.

Balancing at the stationary balancing stand
Clamp a wheel at the balancing stand

It is necessary to remember. At balancing of wheels, as well as at any other repair, the most important rule is cleanliness. Only watching cleanliness, it is possible to achieve faultless result.
The dirt and rust in area прилегания and a centering aperture of a wheel deform result.

Before establish a wheel on the balancing stand, clear a surface прилегания, a centering aperture and a disk.
Establish a wheel with the tyre on the balancing stand.

Fig. 4.13. The tsangovyj adapter

For a wheel inhaling use, for example, цанговый the self-unclenched adapter for balancing stands VAS 5271 (fig. 4.13).

At its use 100 % centering of a wheel and a careful clip of a disk are guaranteed.
Conic adapters for centering do not provide 100 % of centering of a wheel at the stand.
At a deviation from the centre on 0,1 mm on a wheel and the tyre there is a disbalance in 10

Order of works at wheel/tyre balancing
Scroll a wheel with the tyre at the balancing stand.
Check up a course маркировочных strips on sidewallsах tyres in the field of onboard закраины.
Check up protector drawing at a rotating wheel.

At unilateral deterioration, stains of deterioration because of braking with the blocked wheels or strong non-uniform deterioration balancing to reach smoothness of a course it will not be possible. In this case it is necessary to replace the tyre.

Check up accuracy of rotation of a wheel with the tyre. If the wheel with the tyre rotates roughly though flattening of the tyre is not present, radial and lateral palpation can be the reason of it.
Check up a disk with the tyre on presence of radial and lateral palpation.
If radial and lateral palpation are in admission limits, отбалансируйте a wheel with the tyre.

Do not use more than 60 г weight on a wheel.
If it is necessary more грузиков if necessary it is possible to reach good balancing at the expense of minimisation.

On the display of the balancing stand 0 should be displayed
Alternatively it is possible for minimisation use balancing stand VAS 6230.
Fasten a wheel to a nave.
At first tighten the lowermost wheel bolt with the moment approximately 30 Нм.
Then tighten other bolts also on 30 Нм cross-wise. At the expense of it the wheel is centered on a nave.
Lower the car on wheels.
Now tighten wheel bolts cross-wise with the help динамометрического a key for the ordered moment of an inhaling.
After balancing of wheels execute a trial trip.
If at a trial trip palpation the error of balancing because of wheel centering can be its reason nevertheless is felt.
Errors of centering of wheels and naves in adverse cases can be imposed against each other. For this reason palpation also is possible. It can be eliminated by means of the stand for finishing balancing.

Balancing control stand VAS 6230

Fig. 4.14. The balancing stand

By means of balancing control stand VAS 6230, besides known static balancing, it is possible to carry out additional functions (fig. 4.14).
Feature of the given system is check of radial effort of a wheel with the tyre during rotation.
During this check on a wheel presses a roller with effort about 635 kg. Thus, the force operating on a basic surface of a wheel from a surface of road during movement is simulated.
Because of radial and lateral palpation in a wheel and the tyre and various rigidity in the force tyre. Operating on the area of contact of the tyre with road change.
System VAS 6230 distinguishes and remembers position of the maximum measured radial effort in the tyre. By means of it position of the least distance between onboard закраиной rims and the disk centre is measured.

4.1.13. Noise качения tyres

4.1.15. Radial and lateral palpation of wheels and tyres