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What pump starts running under the hood when I open the door?

Discussion in 'Gen 3 Prius Technical Discussion' started by Ripley44224, Jun 9, 2010.

  1. Ripley44224

    Ripley44224 Member

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    Just curious-- After several hours of not running, I open the driver door and hear a pump of some kind start up and run under the hood. Runs for a while then stops. How long seems to depend on how long the car has sat there, but about 30 seconds max. Anyone know what it is?
     
    #1 Ripley44224, Jun 9, 2010
  2. phoenixgreg

    phoenixgreg Senior member

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    I think I read in another thread that it is the power brakes adding some pressure so you have instant braking just in case you run in EV mode briefly.
     
    #2 phoenixgreg, Jun 9, 2010
    1 person likes this.
  3. Paradox

    Paradox Prius Enthusiast / Moderator
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    Yes, it's the brake accumulator pump...
     
    #3 Paradox, Jun 9, 2010
    1 person likes this.
  4. Ripley44224

    Ripley44224 Member

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    Thanks, all!
     
    #4 Ripley44224, Jun 11, 2010
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