do it, do it, doit!
scientific stuff will balance out the testiclefire thread and restore the carmic balance

but really im intrigued by this every part of my brain says it cant have any effect.
can you do a mix of dot 5 and lhm to see if there is any interaction between the two fluids
Sean

If I'm bored on Saturday, I'll give it a shot. Just curious really.

Russell,
I'm curious about it too, however it seems that Hervé Ledeux, the new proprietor of Bonapart Brake Products, may already have carried out this experiment as he has the following to say about the DOT 5 brake fluid which he sells...

"This very high performance brake fluid is compatible with all conventional hydraulic brake and clutch systems with the exception of those which use green-coloured LHM type mineral-based fluid. "

< http://www.bonapart2cv.com/?lg=en >

ken

A 2cv.nl member once did a test to check if LHM-rubbers could withstand DOT-brake fluid.
He put LHM rubbers in some DOT fluid for weeks, and couldn't notice any changes in the rubbers.
After that he drove around for 6 years with the old type brake lines (DOT) and new type (LHM) cilinders, using DOT fluid.
He still uses this setup, only with DOT5 fluids..

No need to check is Russ

Something I've often wondered is why do the two systems use different types of fluid in the first place? As far as I know, most other cars run disc brakes with conventional fluid. Why are 2CVs (and some Rolls Royces, I think) different? Is LHM better? Or what?

certain RR use Citroen suspension/brakes

had fewer problems with siezed calipers and pistons with lhm than dot3 especially as 2cvs often spend a year or two "resting" in their lives, if i ever left a vw van off the road for any extended period you just knew it was a brake rebuild for re comissioning

Sean

The LHM-oil was, as far as I know, developed for the Citroen D-series. As some of you know, the D-series is the most amazing car in the world, and at the time, had technique that was "hi-tec". Citroen even had to invent the production-technique for some of the hydraulic components.

At first they used a couple of oils similar to regular brake-fluid. But they had the disadvantage that they are hygroscopic, as is the case with most brake fluids. This allows water to enter the hydraulic components causing deterioration and expensive maintenance work. So they decided to have a better oil made. This was the LHM.
LHM required completely different materials for the seals. Using either fluid in the incorrect system would completely destroy the hydraulic seals very quickly. They painted all components green and colored the oil green, so no mix ups should be made.
LHM proved to be a great oil, taking much better care of the hydraulic system in the D-series. That's why it continued to be used in the hydraulic Citroen's GS, SM, CX, XM and Xantia.
I guess they thought LHM would do the A-models good to. With less water in the oil, when lazy people didn't change the brakefluid

And why not? Besides from being not hygroscopic, it "cleans" better, lubricates better and doesn't harm paint! And, most importantly, looks waaay cooler.

Just don't store it next to your Christmas bottle of creme de menthe ...

one of Etienne's pictures;

Slightly OT, but I remember at one of the Shrewsbury Halloween camps years ago there was an issue with someone nicking stuff out of people's tents. As it happened he was drinking MD20/20, that weird blue shit. Two or three of us waited until he went to the loo, then poured half of it away and replaced it with screenwash. Probably very dangerous, but it seemed like a good idea then.