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
 




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4.1.8. Service of tyres

Pressure of air in the tyre
The weight of the car flattens the tyre on the area of its contact to road. Kachenie tyres conducts to compulsory deformation of a protector and all брекера. At insufficient pressure the compelled deformation increases, owing to what the temperature and resistance качению raises. These factors conduct to the raised deterioration and negatively influence traffic safety.
Too air high pressure in the tyre leads to the raised deterioration of an average part of a protector and worsens comfortableness. It is recommended to support always pressure of air in the tyres, specified by the manufacturer.

THE NOTE
The resulted schedules do not extend on all scale of production.
They are necessary to show wearability of tyres on forward and back axes, and also wearability of tyres on cars with a forward and full drive.


Depending on service conditions and a running gear achievable service life of tyres can strongly deviate from resulted more low.

Fig. 4.3. Schedule 1 of wearability of tyres



Height of drawing of a protector throughout service life for cars with a forward drive and tyres with an index of speed V.
P – Height of drawing of a protector.
S – Run.
1 – the Forward axis.
2 – the Back axis.

Fig. 4.4. Schedule 2 of wearability of tyres



Height of drawing of a protector throughout service life for cars with a full drive and tyres with an index of speed V.
P – Height of drawing of a protector.
S – Run.
1 – the Forward axis.
2 – the Back axis.
Apparently from schedules 1 and 2, the tyre with full drawing of a protector during certain run wears out more than considerably worn more out tyre. After the first 5000 km it is impossible to judge the general service life of the tyre as the deterioration characteristic passes нелинейно.
On front-wheel cars forward wheels, except efforts at turns and dispersal, are compelled to maintain the most part of lateral and brake efforts. Because of such loadings of the tyre on forward wheels of front-wheel cars wear out much faster, than on back wheels. Uniform deterioration of all tyres is reached at the expense of regular shift of forward and back wheels.


4.1.7. Deterioration of high-speed tyres

4.1.9. In regular intervals worn out tyres