Wheels must be statically and dynamically balanced. There are two methods for this:
The wheel is removed from the car and installed on a balancing machine. It is rotated in experimental mode. The resulting imbalance is balanced by placing lead weights.
To neutralize the last imbalances, precise balancing is necessary. In this case, the imbalances of the wheel hub and the brake disc are also balanced. The wheels mounted on the car, by the power of the engine, are brought into the required rapid rotation, showing a residual imbalance. It is again balanced with lead weights.
For Audi-100 all-wheel drive vehicles, all 4 wheels must be lifted to perform accurate balancing.
Due to the lack of their own drive, the rear wheels of front-wheel drive models are driven by an electric motor with a friction disc for dynamic balancing.
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