The A4 has been built in five generations and is based on the Volkswagen Group B platform. The first generation A4 succeeded the Audi 80. The automaker's internal numbering treats the A4 as a continuation of the Audi 80 lineage, with the initial A4 design
The air shaft clutch can save much energy for every enterprise. Clutch connected and released, so as to prevent the driving motor start and stop frequently, then prolong improve the working efficiency and prolong motor usage life.