I read Stu's note about crushable metal seals... I hadn't heard of, or seen,
metal seals. The Girling two-part calipers that used to come on Volvos had a
square edged rubber O-ring between the halves and it was hard to find that
part except at Volvo dealers. I thought that the calipers on Alpines and
Tigers used the same rubber O-ring. It's not a good idea to use standard
O-rings because they don't have the right edges on them, and for all I know
may not be compatible with brake fluid.
Good luck,
Theo
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