BMW has announced that they are recalling certain models of the 2004 through 2010 5 Series, 6 Series, and model year 2002-2008 7 Series vehicles. They stated that a check valve of the brake vaccum pump may leak a small amount of lubricating oil. Over time this could result in contamination of the brake booster.
Power assist braking performance could be adversely affected. In extreme cases there could be a complete loss of power assist braking. An unexpected reduction or loss in power braking assist may increase the risk of a crash. The manufacturer has not yet provided a remedy or a owner notification schedule for this campaign. Owners may contact BMW at 1-800-525-7417.