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Rear Girling caliper troubles --Conclusion
In message <4C4A9771494@enm.enm.maine.edu> "Kurt Wesseling" writes:
> As several of you suggested, the piston *does* indeed have to be
> screwed or "spiraled" in (as Phil P. described it)
> There is also a 12 or 13 mm hex head fitting in the center of the
> piston--in my case both of them were pretty well rounded out and
It's 12. 13mm doesn't exist - the size is not defined in the Allen
specifications. The large ones are 10, 12, 14, 17 and 19mm.
(Unless, of course, you've ever tried to get the injector seats out of an MB
engine. Fortunately, "Beargrip" tools (Holland) haven't read the Allen
specifications and they actually manufacture a 13mm hex key and driver.)
Personally, I believe there is no other tool where quality is so important.
The very best quality Allen keys cost only a very few $$ more than a junk set,
yet there are so many places where this kind of damage can be _very_ expensive.
Committee Member, UK Audi [ur-]quattro Owners Club