Checking for damage and wear
WARNING: This page is about a different car, the 2010 BMW 650i, 2009 BMW 650i, and 2008 BMW 650i. However, it is still accessible from the selected car via links, so may be relevant.
Check gaiters, flexible disc and axle and tie rod sleeves for damage (e.g. cracks, holes), for leaks or missing clamping bands on gaiters.