Hydraulic Cylinders
WARNING: This page is about a different car, the 2003 BMW Z8, 2002 BMW Z8, 2001 BMW Z8, and 2000 BMW Z8. However, it is still accessible from the selected car via links, so may be relevant.
The convertible top is operated by 2 hydraulic cylinders (which reduces stress from the top frame). They are located behind each seat under the rear interior trim panels. The hydraulic lines are routed into the body behind the driver's seat. See Fig 1 .