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Originally Posted by veedubdrew
2003 and earlier Prius models don't make this noise because they rely on the engine's vacuum to keep the brake booster charged.
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Actually they do have electric brake boosters, at least our 2001 does. Same thing happens, pump the brakes a few times and then a few seconds of buzzing with a little clicky-pop at the end... The engine doesn't turn on for more brake vacuum.