Dave0430 said, And if yours is still working it is rebuildable.
Yes, this is true. Without a doubt!!
But Dave, I really cant believe that you would say that there is only one size master cylinder for all! You of all people? Don't for gods sake for the first time in your life lead a poor questioning Mofo' astray, there's the 12mm for the split brake and the 14mm for the seperate brake system and no-one quite knows when in '83 they decided to change it.
I know for sure that I have true and real testimony to that, it took a long time and real $$$$ to figure it out.
My whole deal in this thread is, that I probably have an '83 split brake front master cylinder to offer this guy, 'cause I bought enough of them from people on there (ebay) and due their spiel, I bought $#!T I just can't use. But I finally got it right and realized that they really will lie to you!! Or just, over simplify things because they don't know either.
Can't help you with an '80-'82 separate master cylinder system, because i've got the best stuff available on that ol' bike to the left, and I ain't parting with any of it!
Hey just putting this out there too. while I'm at it, are you sure it's a master cylinder your'e after, and not just, "within specs" rotors,
now I really can, help you out with those!!
http://www.goldwingfacts.com/forums/7-sale-wanted-forum/397639-pre-ebay-sale-gl1100-parts.html