It doesn't sound like rushing water or pooled water, just a single drop sound.
Toyota Q&AAsk Your Question
2008 Toyota Prius Question: When I stop on an incline and then accelerate, I hear a water drop noise.
Answer #1tdtoolbox March 28, 2013, 15:58Journeyman
you must have really good hearing i would check all your fluid levels. possible wipper washer fluid ps i love my prius
Answer #2Prius driver April 09, 2013, 10:12Rookie
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.
Replyskisully, April 09, 2013, 10:19Rookie
Exactly! Any luck determining the cause?
ReplyPrius driver, April 09, 2013, 10:43Rookie
Not yet. My mechanic's never heard of this. Have you asked a dealer's mechanic?
Replyskisully, April 09, 2013, 10:49Rookie
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.
ReplySpravka, March 19, 2014, 06:46Rookie
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.