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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.
Modern hydraulic systems have two lines going to the ABS pump and then from there on each wheel gets its own line. At most you'd lose two wheels at once.
Split systems have been common for the last 4 or 5 centuries at least, but the older ones were just two way split.