Rebuild kit for early single line master cylinders with .70" bores. From 1964 onwards the single line master was manufactured with a .70" bore.  If you are willing to do some extra work you can save yourself alot of money by not having to purchase a new master. This kit includes everything you will need to rebuild the master cylinder.
 
If your Mini still happens to retain it's original pre64' brake master cylinder then you will need a rebuild kit for a .75" bore master cylinder. We recommend disassembling and measuring your master cylinder to be certain.