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The First Modern Car Without Hydraulic Brakes Is Headed to Production
(www.thedrive.com)
This is a most excellent place for technology news and articles.
1970s/early 80s. The master cylinder has two chambers, though they are connected.
I wouldn't really consider that 2 seperate systems. If your front brakes leak you're still gonna end up losing pressure to the rear. Its pretty much just enough to pull over if you clue in to whats happening
that is what I was trying to say, but perhaps I didn't write well.