Brake Booster Every 15 Sec?

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

  1. rjparker

    rjparker Senior Member

    Joined:
    Jun 6, 2008
    2,123
    881
    1
    Location:
    Texas Hill Country
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    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

    Joined:
    May 11, 2005
    89,454
    40,029
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    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

    Joined:
    Jul 25, 2007
    8,339
    3,774
    0
    Location:
    Clearwater, Florida
    Vehicle:
    2007 Prius
    Model:
    Two
    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

    Joined:
    May 11, 2005
    89,454
    40,029
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    bummer, no extended warranty?
     
  5. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    9,959
    7,320
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    "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

    Joined:
    Jun 6, 2008
    2,123
    881
    1
    Location:
    Texas Hill Country
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    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

    Joined:
    Jul 17, 2018
    734
    299
    3
    Location:
    SE Texas
    Vehicle:
    2013 Prius v wagon
    Model:
    LE AWD-e
    Mine just started doing this...every 12 seconds...did you find out anthony else?
     
  8. johnHRP

    johnHRP Junior Member

    Joined:
    Aug 6, 2014
    41
    12
    0
    Location:
    tally, fl
    Vehicle:
    2008 Prius
    Model:
    ----USA----
  9. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    9,959
    7,320
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    Há Ži, welcome to PriusChat, where a lot of people come looking for accurate information about their Prius cars.

    The 'campaign ZJB' document linked above applies only to 3rd generation Prius liftback and Prius Plug-in (PHV) cars, not to the v or the c. The end dates vary by model year:

    [​IMG]

    So it's already over for 2010s (unless anybody's got one that hasn't rolled 150k by now).

    For 2011s through 15s, it is still in force through August 2021 and then to your tenth year or 150k miles, whichever comes first.

    It is a replacement conditioned on specific failures ("certain internal malfunctions of the brake booster and brake booster pump assemblies"). It is good to remember that in the 3rd generation Prius, those are two different assemblies:

    [​IMG]

    There is a list of trouble codes that may mean the covered failure has occurred. They are codes that can also be set for other reasons. Sometimes a few simple steps of diagnosis will reveal that something else has caused the codes you have, and that replacement of one or even both these assemblies would not be the necessary solution.
     
  10. rjparker

    rjparker Senior Member

    Joined:
    Jun 6, 2008
    2,123
    881
    1
    Location:
    Texas Hill Country
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    They are not covering the Prius v in this program. That's the heart of the issue because they are covering the hatchbacks.
     
Loading...