I made new stainless steel pistons for mine and started using the silicone fluid in clutch and brake. 20 years and no leaks, last year I had to do the clutch master and slave.

an easy option that inst; new is to add a little float with an audible alarm, That is of course not double circuit but at least it can warn you.


I took my drums in and they put on new shoes using the old backing plates. they arced them to actually fit. I liked their work so much I had them do a second set which I put away, the place soon after disapeared, asbestos issues, no doubt.
I also made a second set of pistons , thinking I would finish rebuilding a second set of calipers.

last summer I bought a 85 porsche 944 in that they use a hydraulic clutch and the clutch and brake systems share the master cylinder. the design there is such that if the brake master runs low, the clutch stops working first, which actually is a lot better than the brakes running dry with no warning , of course it will be dual circuit too. next summer I plan to get it working because it sat at least a dozen years. No garage so it's on hold due to it being too cold out there now.

I dont really want to mod my brakes that much but I think the audible alarm is a fairly easy solution and that would probably be enough to not make the mistake of running them dry. some more modern cars have the float switch thing so it can likely be found at a wrecker, or maybe it's sold through IPD or similar.

converting to silicone fluid does make the brakes a little bit mushy but I seem to do OK with that. it might not be the best solution but I think it helps the brakes not get so full of water so easily. I went though clutch master and slave seals regularly but after I went to silicone it was fine for 20 years. before I did that I was changing seals and trying different fluids. Usiually the girling type, but they all seemed to eat the clutch rubber seals within a year or two.

if you look at the clutch the fork moves in an arc and the piston is a straight linear motion so it adds a bit of sideload by design, and that can probably make the clutch slave's bore go a bit egg shaped over time.