Order of execution
1. Turn each wheel fully once.
2. Remove foreign bodies, such as small stones, with a narrow screwdriver, being careful not to damage the tire profile.
3. Tire profile according to the 1992 law must be at least 1.6 mm deep across the entire tread width.
4. But for the sake of safety, it is necessary to change the tires when the wear reaches 3 mm of the residual profile width, since the wide-section tires of the Audi A4 float on wet roads earlier than the narrow tires of older models.
5. To check the wear, elevations are used, passing at equal distances across the working surface in the grooves of the profile. They are marked on the sides of the tires with letters «TWI» (Tread Wear Indicator - tire wear indicator).
6. If these bulges are at the same height as the tread pattern, then the tire has a residual depth of 1.6 mm - you need to urgently change the tires.
7. Based on the nature of the profile wear, some conclusions can be drawn, which are described in the next section.
Tread pattern
1. Front tires worn on the outside are not unusual for an Audi. The reason is the increased load on this section of the tread during a turn.
2. A profile worn off on one side may indicate incorrect wheel balancing; especially when one tire is obliquely worn.
3. Severe wear in the middle of the profile can also be a sign of too much pressure. This effect is especially pronounced on the rear wheels. Or it occurs when driving too fast, which rounds the tread surface.
4. If both outer shoulders of one tire are worn more than the middle of the profile, then this means that the car has been moving for a long time with too low tire pressure.
5. Uniform washouts in the profile indicate a defective shock absorber.
6. If uneven abrasion appears in certain places, then this means that the wheel is unbalanced or the tire is damaged.
Tip: If you need to remove a working wheel, for example, to check the brake, then first you need to note the position of the wheel relative to the hub. Otherwise, after installation, the balance will be disturbed. Next, you should pay attention to the fact that the brake disc does not rotate on the wheel hub.
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