Thanks for the info guys. Great links Paul!

Guess I am going to have to crawl under and take a closer look.

The referenced article for the 911 does not mention the speed sensor in the rear. I assume there is a seal for that also? From the picture you posted it looks like there is circlip holding the rear sensor in place.

Paul, did you completely rebuild yours or just took it down to the leaking center seal?

Once/if I get it apart, how can I tell if its worth rebuilding? Any damage to the piston/bore areas should I assume its junk? Other than the seals, what wears out/fails?

Thanks again.

Tinker