The essence of the work of the Audi A4 Wheel Bearing is to ensure that each wheel turns with nearly zero friction in order to allow the car to seem stable, fast, and silent whenever it is driven. This Wheel Bearing is hidden in the hub and features hardened steel balls or tapered rollers that slide into a smooth race, reduce drag, and ensure that tire contact when an Audi corners or brakes is predictable. Over the years the brand has installed three broadly applied hub setups, and each determines the manner in which the bearing is serviced and the duration it can last under normal Audi loads. The majority of the new models use a sealed unit hub, which is an inbuilt design that can even carry the ABS sensor, and then the whole is changed when it is worn rather than allowing drivers to dismantle the Wheel Bearing itself. Some of these types of front-driven wheels still employ a press-fit type by having the steering knuckle unscrewed and the hub and bearing parted, and then assembled once again, allowing the inner races to be accessed without having to replace the outer Audi hub. Older non-driven rear axles may have opposed tapered roller bearings, which are removable, cleaned, and filled with fresh grease, akin to the highly serviceable Wheel Bearing style to have been applied on an A4 platform. No matter what type, having an Audi hub tight and smooth will result in less vibration, less chance of handling at the edge of control, and less tire wear, since a tired bearing will wobble, and the sensor or the suspension just cannot fully control this.
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