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Winding up noise in brakes?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by austinography, Jul 29, 2014.

  1. austinography

    austinography New Member

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    Hi all,

    I am a fairly new Prius owner, so forgive me if this is normal and common knowledge. I have noticed that when I get on the brake, I will hear a sort of winding up noise, or a noise like a very small motor running for just a few seconds. It seems to happen every time I first get on the breaks when moving at a speed above 25 mph, and I can interrupt it if I take my foot off the brake. I kind of thought maybe it was something to do with the regen brake system, but I wanted to make sure it's not an indication of an issue.

    TIA,

    Ryan
     
    #1 austinography, Jul 29, 2014
  2. GrumpyCabbie

    GrumpyCabbie Senior Member

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    Is it more like the buzzing of a compressor? If so, then that sounds normal.

    The brake compressor will buzz away for about 5 seconds when you first get it.
     
    #2 GrumpyCabbie, Jul 29, 2014
  3. austinography

    austinography New Member

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    Yea, it could be described as a buzzing I guess. Is it normal to hear it each time you're on the break?
     
    #3 austinography, Jul 29, 2014
  4. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    Here is the Gen 2 brake noise. I have no idea what a break noise sounds like.

     
    #4 JimboPalmer, Jul 29, 2014
  5. GrumpyCabbie

    GrumpyCabbie Senior Member

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    Each and every time? Hmmm possibly not, but it does refresh often. Normally you won't hear it as you're driving. I had my original brake pump replaced by recall and the new one is much quieter. You might want to check whether yours was changed.
     
    #5 GrumpyCabbie, Jul 29, 2014
  6. austinography

    austinography New Member

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    Yea, the sound in that video sounds like the same thing, only I hear it more muted b/c I am not under the dash like that. I don't see anything in the service history about the brake pump. The brakes were serviced and cleaned and the water pump was replaced about 8K miles ago.
     
    #6 austinography, Jul 29, 2014
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