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whirring noise when opening the drivers door.

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by magnumrtawd, Jan 23, 2014.

  1. magnumrtawd

    magnumrtawd Member

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    What is whirring noise when opening the drivers door after setting a while?
     
    #1 magnumrtawd, Jan 23, 2014
  2. xliderider

    xliderider Senior Member

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    It's the brake booster pressurizing the brake system.

    SCH-I535
     
    #2 xliderider, Jan 23, 2014
    hybridbear likes this.
  3. magnumrtawd

    magnumrtawd Member

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    Thanks. That sounds logical.
    I don't remember hearing that with my 2008.
     
    #3 magnumrtawd, Jan 23, 2014
  4. David Beale

    David Beale Senior Member

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    2008 also did it. Varies car to car. Some brake systems loose pressure over time faster than others.
     
    #4 David Beale, Jan 23, 2014
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