Thanks for the tip on checking the rubber components, Soren. I don't feel stepped on at all since my decision to change to DOT 5 was partly based on opinion and evidence of several seasoned (I use that in the nicest way) members of this board who have had good results Thanks for the heads-up George).

I am under the impression that older DOT 5s did have some issues with damaging rubber but that these were 'solved' in later versions. Did you have this trouble with old rubber and older silicone? If my seals are newer then perhaps they will be more resistant?

If I find that the rubber is getting damaged faster than just wear and tear then I shall hold my hands up and consider changing back. That's the great thing about old cars; they make you quite philosphical (except about emergency braking on the motorway, then you're back to regular cursing!).

Tom