What is LMA first??? SYN fluid and why change to it?? Most any alcohol will flush system and then add air pressure. ( NOTE ) DOT 3 DOT 5 are alcohol base and by number 3 or 5 temp rated 5 being higher temp rated for new cars with disk all around. If you are racing OK down hill a lot mountain driving OK DOT 5 will handle all that. If you car sat for years it might be needed. I will tell you that alcohol will not freeze and in a pinch you can add water to it and easy drain when back home. I was at a class last year doing valve seats on a Jag head they cooled the seats in dry ice and rubbing alcohol. The point of boiling is quite high also
DOT 5. And last why, we would like to think about the same when working on our cars. Madflyer
I'm not quite sure what to make of this comment. DoT3, 4 and 5.1 are glycol-based. Chemically, a glycol is a type of alcohol, but 'alcohol,' whether ethylene or isopropyl (rubbing) would not be suitable brake fluids (their boiling points are very low; in fact, they evaporate at room temperature).
https://www.britannica.com/science/glycol
DoT5, aka silicone BF, is not an alcohol at all but is based on silicone compounds:
https://en.wikipedia.org/wiki/Brake_fluid
The people at the Jag tech session used dry ice with alcohol--alcohol freezing points are much lower than water's, and some older formulations of antifreeze used alcohols--to slightly shrink the valve seats so they'd go into the head easier (I suspect they heated the head somehow, too?). A few years ago I put new bearings and races in new hubs for my BJ8, and put the hubs in the oven and the races in dry ice. As the races warmed-up and the hubs cooled they made a most scary-sounding wail; I assume they were rubbing each other as the temps equalized (I was actually afraid something would crack).
Alcohol will dissolve glycols, as they're in the same general chemical family; I don't know what would be the best solvent for DoT5. Water is absolutely the last thing you want in your braking system (and DoT5 is not miscible with water). I've noticed the BF makers have started putting 'synthetic' on their labels, perhaps to cash in on the cachet of synthetic oil but, aside from some plants and animals that can manufacture glycols to survive freezing temps all glycols are 'synthetic.' 'LMA' is a Castrol BF, it stands for 'Low Moisture Activity' because, as I said, water in BF is undesirable.
Edit: If I was going to make this switch, I would try both ethanol and isopropyl alcohol to check for solubility/miscibility with DoT5 (note both alcohols are hygroscopic and could introduce some water into the system). Maybe something else entirely, like 'brake parts cleaner' would work better.