If the previous model Audi 80 was still equipped with a mechanical locking of the rear axle, then in the A4 the locking is carried out by the EDS system. Its advantage is that the blocking also acts on the front wheels, but there is a disadvantage that the blocking effect is achieved only by braking the spinning wheel, which under certain operating conditions is less effective than mechanical blocking.
The EDS system is closely related to the anti-lock system, so read the technical information about EDS in the section ABS and EDS.
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