Brake Booster Every 15 Sec?

Discussion in 'Prius v Main Forum' started by rjparker, Oct 15, 2019.

  1. rjparker

    rjparker Senior Member

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    I am on the road and getting some kind of mild electric motor noise every 15 seconds or so. It sounds like its under the dash and its really only audible with the windows up. Brake Booster or?
     
  2. bisco

    bisco cookie crumbler

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    i thought the booster was a buzzing noise. coolant pump maybe? or hvac vent door actuator?
    how many miles on her?
     
  3. edthefox5

    edthefox5 Senior Member

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    Bad abs module it has a leak. Very common very expensive to repair.

    Use search forum and search

    Abs module
     
  4. bisco

    bisco cookie crumbler

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    bummer, no extended warranty?
     
  5. ChapmanF

    ChapmanF Senior Member

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    "Mild electric motor noise", "buzzing noise", people hear different things. There's a pump driven by an electric motor, so it would be fair to call it an electric motor noise, even if some people describe it as buzzy.

    How often it has to re-pump depends on a lot of things, such as ... how often you're using the brakes. Every time you use them, some fluid is transferred from the accumulator out to the brakes, and then back to the reservoir. When the accumulator pressure is low enough, it's pumped back up. If you're in stop-and-go traffic, that'll happen often. If you're sitting there not touching the brakes and the pump has to repeatedly cycle, that's another story.

    Before deciding every worst-case scenario is actually happening to you, you might plug in Techstream and just watch the live accumulator pressure reading, see how noticeably it's dropping between pump runs when no one is using the brakes.
     
  6. rjparker

    rjparker Senior Member

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    Its 230k on the v and the noise is coming from under the hood near the brake systems, drivers side firewall. I will check it with techstream in the next day or two. I notice something is pulsing the brakes at very low speeds as well.
     
  7. Tim Jones

    Tim Jones Active Member

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    Mine just started doing this...every 12 seconds...did you find out anthony else?
     
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