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I’ve previously commented that I had the original brakes on my 2001 Prius when I traded it in at 330,000 miles. I learned early on that applying then letting up a bit on the brakes performed almost entirely regenerative braking. The most dangerous aspect of this technique was that the regenerative braking would “shut off” if the car hit a bump too hard so every once in a while you could be slowing down fairly dramatically and suddenly have NO brakes. Of course a bit more brake pressure solved the problem but it could certainly make for a dramatic few seconds, depending on what you’re pointing at and how close you are.