There are a couple of firms that will bore out the cylinder and insert a new stainless steel bore. I'm unaware of anyone who has used this service but it sounds to me to be a very viable option if the mastercylinder bore is beyond redemption and new ones unavailable.
Also the stainless will go some way to counteracting the hygroscopic nature of brake fluid.
Adverts can be found in classic car mags and weeklies.
Last edited by Cheshire_David; 28/01/15 02:16 PM.
