When I stop on an incline and then accelerate, I hear a water drop noise. on 2008 Toyota Prius

It doesn't sound like rushing water or pooled water, just a single drop sound.

by in Portland, OR on March 28, 2013
2 answers 6 comments
ANSWER by on March 28, 2013
you must have really good hearing i would check all your fluid levels. possible wipper washer fluid ps i love my prius
ANSWER by on April 09, 2013
I have heard the same single-drop sound. It's almost like a recording of a water-drop sound effect: "bwop." It's from the rear right part of the car. It comes only sporadically, and it's too loud to be an actual fluid.
COMMENT by on April 09, 2013
Exactly! Any luck determining the cause?
COMMENT by on April 09, 2013
Not yet. My mechanic's never heard of this. Have you asked a dealer's mechanic?
COMMENT by on April 09, 2013
Not yet. I believe it started after I took it in for the 90k mile service. I have an appointment in a few weeks, so I will ask them.
COMMENT by on March 19, 2014
Did you ever find out? I'm having the exact same issue: A recorded-sounding electronic "bwop" sound (like an old Apple Mac "droplet" sound) that comes from the right rear on my 2007 Prius, which currently has 95K on it. It's sporadic, and I can't figure out it's relationship to braking or inclines.
COMMENT by on April 14, 2015
My 2009 Prius which has only 65,000 miles also makes this electronic "water droplet" sound. It's not actually water just sounds like it. Anyone figure it out yet?
COMMENT by on April 15, 2015
My husband thinks it is a gas releasing from the battery, which is in that location. I think it happens mostly in the warmer weather.

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