Most late model MB and Audi with stability control/ABS systems will not manually bleed. They require flushing with a (relatively) high pressure pressure bleeder (2-3 bar/30-45psi) with system enabled (ign on) The appropriate tool is $1200 and has an electric pump. One of the BMW tuners (Turner Motorsport?) sells a nice hand-pump pressure blleder tank w/resevoir adapter for around 80bucks that works well-just need to keep it pumped up enough. phil