Join Date: Aug 2008
Location: Topeka, KS, USA
Fixing the Rubber Ball Joint Boot
So in another BMW engineering marvel, someone decided to attach one end of the rubber boot to the half of the ball joint that turns, and the other end to the half that doesn turn. When new, there's a rubber gasket inside the top of the boot which allows it to slide on the metal disk it's attached to until the grease dries out and then it just rips open from rotational torque. Poor design, in my opinion.
So off to the auto parts store (O'Reilly Auto) I went. They sell a two pack of universal replacement tie rod boots. One large and one small. If you cut them roughly in half, the top half of the large one will attach to the bottom of the ball joint and friction fit to the bottom of the disk where the old boot attached. The small boot will attach to the metal disc where the original boot attached and friction fit against the top of the bottom boot. So what I wound up with is two boots and a double seal on the ball joint. Total cost under twelve dollars and that included a tube of CV joint grease to service the ball joint. I'll post a couple photos later.
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