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.
M
http://www.goldwingfacts.com/forums/7-sale-wanted-forum/397639-pre-ebay-sale-gl1100-parts.html