"rocker panels" are located below the doors and
extend from one wheel well to the other. Even though rocker
panels on most cars are important, the fact that the CS
doesn't have a "B" pillar makes them that much
more vital. A decorative rocker cover is mounted on the
outside of the rockers, which can hide just about all of
the pesky rust underneath. The cover must be removed to
inspect the panels properly. Pay extra attention to the
areas at the front and rear.
can rust from moisture collected from the road wheels and
exposed areas from rock chips, and also from water that
enters from the sunroof drains. On cars with sunroofs, BMW
decided to run the drains down through the "C"
pillars, in front of the rear wheel well and out through
the rear of the rockers. If the drain holes formed in the
rear of the rockers clog, moisture sits inside and contributes