MOT No. 24
This check is best done with the vehicle raised, for example when changing the oil at a gas station.
Fully rotate each wheel.
Foreign objects such as small stones can be removed from the slots of the tread profile with a narrow screwdriver without damaging the tires.
Since 1992, tires have been required to have a profile depth of at least 1.6 mm across the entire width.
For safety reasons, you should change tires already when they are worn down to 3 mm. because the wide tires Audi-100 «are floating» on wet roads earlier than the narrower tires of older cars.
To control wear, there are elevations in the grooves of the tread pattern, passing at regular intervals perpendicular to the tread tread. They are marked on the sidewall of the tire with letters «TWI» (tread wear indicator - profile wear indicator).
If these elevations are flush with the grooves in the profile pattern, then the remaining profile is 1.6 mm and the tire should be changed immediately.
You can understand a lot by the type of profile wear, description in the next section.
Left: this is how the steel rim for the Audi-100 looks like. The following designations are embossed in the metal:
1 - rim designation;
2 - departure value;
3 is the part number.
Right: Suitable wheel bolts for steel and light alloy wheels from Audi can be recognized by the recesses on the bolt head.
If a serviceable, balanced wheel is installed on the car - for example, after checking the condition of the brakes, then it must be tightened on the wheel hub in the same position as before removal. To do this, note the position on the rim and wheel hub. The arrows show the mark made by the driver.
Tire wear pattern
Front tires that are more worn on the outside are not unusual in an Audi-100. The reason is the increased load on this area of the treadmill when cornering.
Unilaterally worn tires, however, can also indicate incorrect wheel alignment; especially if only one tire is worn this way.
Severe wear in the middle of the tire indicates overinflation. This effect is especially noticeable on the rear wheels. Or you ride a lot at high speed, which causes the treadmill to round out.
If the profile is worn more on both outer sides of the tire than in the middle, then the air pressure in the tires has been too low for a long time
Uneven, patchy, tire profile wear indicates a defective shock absorber.
If uneven wear appears only in certain places, then the wheel is not balanced or the tire carcass is damaged.
The one and only place with strong wear of the profile was formed as a result of braking with a blocked wheel, the so-called «brake mark». Only for non-ABS models, if the ABS is faulty or the ABS is off.
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