Regardless, if you need seals for braking systems the material you want is EPDM. Common o-rings from the hardware store are typically Buna-N (a.k.a. Nitrile). Don't use Buna (or Viton) for brakes or clutch hydraulics. If you need EPDM o-rings you can buy them from Mcmaster.com. Search using the keyword "o-ring" and search through their sizes and materials for what you need.
Doug L.
You didn't hear this from me. 25 years ago I stuffed a fatter O-ring in my Spitfire master cylinder. Maybe I was lucky it was made of the correct material. Still works fine.
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