Audi A3

Since 1997 of release

Repair and car operation



Audi A3
+ The maintenance instruction
+ Current leaving and service
+ The engine
+ Systems of cooling, heating
+ The power supply system and release of the fulfilled gases
+ Engine electric equipment
+ Manual box of a gear change
+ Automatic transmission and models with a full drive
+ Coupling and power shafts
+ Brake system
- Suspension bracket and steering
   + Forward suspension bracket
   + Back suspension bracket
   - Steering
      Removal and installation of the block of a pillow of safety
      Removal and steering wheel installation
      Removal and installation of steering draught/tip of steering draught
      Removal and installation of the pump of the hydraulic booster of a wheel
      Corners of installation of forward wheels
+ Body
+ Onboard electric equipment
+ Electroschemes


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Corners of installation of forward wheels

THE GENERAL DATA

Corners of installation of wheels


Corners of installation of wheels appreciably influence stability of the car, deterioration of tyres and the fuel expense. Distinguish following corners of installation of wheels:

Disorder is an inclination of a wheel in a vertical plane concerning an average line of the car. It can be positive if wheels are inclined outside or negative if wheels are inclined inside. The disorder corner, basically, influences uniformity of deterioration of tyres of forward wheels. If disorder of one wheel positive, and another negative the car will withdraw aside at movement on a straight line.

Convergence – lateral distance between wheels. The positive convergence means that wheels are in front located is more close to each other, than behind at measurement at height of an average point of a wheel. The negative convergence means that wheels in front are on большем distance from each other, than behind.

The cross-section inclination of an axis of turn of a wheel is a corner between an axis of an inclination of a rotary fist and a vertical spent through a point of fastening of a wheel, looking in a longitudinal direction of the car.

At the expense of corners of disorder and a cross-section inclination of an axis of turn of a point of a contact of wheels with road settle down more close to an axis of a rotary fist. It supports so-called „a shoulder обкатки“, the driving is easier. Also blows from roughness of a covering are less transferred to a steering.

Corner of a longitudinal inclination of an axis of turn of a wheel. The axis concerning which there is a wheel turn, takes places in space so that its bottom part is directed forward. Such corner of a longitudinal inclination is called as positive. At positive value of a corner self-return of a wheel to average position after turn improves.

Conditions of check of corners of installation of wheels

Check of corners of installation of the car demands presence of a viewing ditch or the special measuring lift. At measurement carrying out it is necessary to satisfy following conditions:

– Pressure of air in tyres corresponds to the set.
– Forward wheels are put directly.
– The car is not loaded, the fuel tank is completely filled.
– Car suspension brackets strongly прожаты.
– The steering is adjusted.
– Backlashes in interface of steering draughts lie within the admissible
– Backlashes in suspension bracket interface lie within the admissible
– Depth of drawing of a protector of tyres of one axis is identical.

Values of corners of installation of wheels are resulted in Specifications.
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