NEW strange brake noise

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by molain, Nov 6, 2004.

  1. molain

    molain Junior Member

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    Hello,

    Over the past couple days, my '04 Prius (which I've owned since April) has started making a new noise when braking. It sounds about like I'm tapping the horn really briefly (moreso than I could actually do) whenver I come to a complete stop. It also does it twice quickly when I first turn on the car if I release and apply the brake. This is in addition to the normal whirring/clicking sound the brakes make. The first couple times I heard it, I thought it might be other people honking. I don't seem to have lost braking power or anything, but I'm rather concerned by it. Any ideas before I drag it in to my dealer?

    Thanks
    -Ben
     
  2. TonyPSchaefer

    TonyPSchaefer Your Friendly Moderator
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    I thought it was just me. I considered posting about it but figured that I was working the brake oddly and no one would know what I was talking about. My auditory hallucinations have been realized!

    The first time I heard this, I was at a stoplight. I heard honking that I swear came from the front-left, only I was in the left lane with a row of traffic to my right. I looked over anyway and saw a Classic Prius. I figured he honked.

    A different day at a stoplight I heard it again only this time, I was in the front of the line. Of course I got a little annoyed because the light hadn't even changed yet and someone was honking at me.

    Then finally, I was at a stoplight with no one even close and I heard honking. Again from the front-left. This time I knew it was coming from Priapus. I figured I was letting the brakes slip a little and the noise just happened to sound like honking.

    This doesn't solve the question of where it's coming from, but it's good to know it's not just me.
     
  3. DaveinOlyWA

    DaveinOlyWA 3rd Time was Solariffic!!

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    interesting... tell me more
     
  4. molain

    molain Junior Member

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    <div class='quotetop'>QUOTE(DaveinOlyWA\";p=\"49035)</div>
    What more do you want to know? I'll let the forums know when/if I get it fixed, and what did it.

    -Ben
     
  5. DaveinOlyWA

    DaveinOlyWA 3rd Time was Solariffic!!

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    i have never heard anything remotely like what you are describing.

    my brakes do make whirring and ticking sounds but nothing that is loud enough as to be mistaken for another vehicle.

    is there anything you are doing that will cause this. iow, can you predict when it will make this sound and how often has it happened?
     
  6. molain

    molain Junior Member

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    <div class='quotetop'>QUOTE(DaveinOlyWA\";p=\"49039)</div>
    Dave,

    I'm doing nothing unusual -- I'm driving the car exactly as I have for the past seven months, during which it did not make this noise. I tend to be a pretty gentle driver, although since I go to school in Worcester, MA, there are times I'm forced to drive aggressively. The times it makes the noise are described in my first post.

    I'm almost tempted to think the computer is actually beeping the horn briefly due to the sound of it, but I see no reason why the computer would even have control of the horn. It's not a solid honk, it's a quick blip, so it's hard to get a proper description of it or track down exactly from where it's coming.

    Thanks in advance
    -Ben
     
  7. williaeh22

    williaeh22 Junior Member

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    The first couple of mornings while on vaction in Longmont, CO, a chirping sound was produced when applying the brakes. The temperature was in the low 40's and the altitude in Longmont is 5450'. By noontime the noise had disappeared. After a couple of days the system acclimated itself and did not hear it again. The sound was like high pressure fluid being let thru a small orifice.
     
  8. molain

    molain Junior Member

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    <div class='quotetop'>QUOTE(williaeh22\";p=\"49048)</div>
    Thanks, that's good to hear. It has been getting colder here -- colder than my Prius has experienced yet -- so that may explain it. I'll give it some time to go away.
     
  9. mstar

    mstar New Member

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    I've had this same oddity occur as well.

    1: At a full stop.

    2: Press brake pedal in deeply, and release a little

    Result: Loud chirp/squeak (had to describe).

    Context: Canadian winter. : ) Could be a result of this, as I seem to be reading above.

    I'll be taking into the dealer soon for a 32K servicing, and well let you know what comes of it.
     
  10. usbseawolf2000

    usbseawolf2000 HSD PhD

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    <div class='quotetop'>QUOTE(mstar @ Mar 4 2007, 07:10 PM) [snapback]400043[/snapback]</div>
    Do so before 36k when the warranty expires. Check here for the TSB. http://priuschat.com/index.php?showtopic=3...amp;hl=br001-07

    My car makes the same sound. I scheduled an appointment to diagnose if they'll need to replace the Brake Actuator or not.
     
  11. wyounger

    wyounger New Member

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    My '07 does it too, but only on the coldest of winter days it sees here in Georgia. I notice it especially when I first turn the car on and put my foot on the brake pedal to select D or R. I can also induce it while sitting at a stop such as a red light by pushing extra-hard on the brake pedal, then going back to normal pressure.
     
  12. dmsfca

    dmsfca New Member

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    Bringing this back to life - my 16k mi 2007 just started doing it this weekend. At the very first initial tap on the brakes, like as soon as your foot starts to press the pedal, you hear a loud "CHIRP". I agree with another poster - it sounds like some sort of release valve releasing some pressure.

    I drove up into higher elevation (6500') from sea-level this weekend, so my initial thought is that it was related to the higher elevation change. I was going to wait until I came down to sea-level again to see if it continued, but wanted to see if any fellow forum members experienced this - never saw any final resolution - any updates to the thread?
     
  13. simbimbo

    simbimbo New Member

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    My 2008 just started making the same noise. I keep trying to reproduce it on demand, but I have not been able too. Just like some other posters, I thought someone was honking at me, but it's just my little Prius. I only have 6k miles, so as soon as I can reproduce I will bring in in to the dealer.
     
  14. San Jose

    San Jose New Member

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    Took our 2006 Prius in today with the odd brief "honk" (we feel badly because the first time it happened we gave the lady behind us a dirty look because we thought she was honking at us for no reason.). Anyway, they could not find anything wrong with it car and they said they put the car through the "full cycle" of tests. The car did not make the noise on the way home. We will see. The weather has been very cold the last couple of days...maybe that's it.
     
  15. Rokeby

    Rokeby Member

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  16. rexg

    rexg Junior Member

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    I experienced the same issue with one of my priuses when i went to the snow big bear 2 weeks ago. The squeaking went away when the outside temp rose to 45 degrees. The problem is, I have an '08. I called toyota here in Los Angeles and they said they wont be able to do anything unless they can replicate the problem to justify warranty work. Wth!! Los Angeles does not have freezing weather and if so, it would be at 2am one day a year and would rise up to 60 degrees in the morning. Maybe i should take the prius to a snowy state and have it repaired over there. LOL!! I hope its nothing serious though because i dont want to drive off a cliff.
     
  17. San Miguel

    San Miguel Junior Member

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    I just took my 2007, which I have owned for about 3 months, to the dealer, in Santa Fe, NM, to check out the chirping noise from the brakes. Here's what they said. First, since I have 39,000 miles on it, the defect is not covered by warranty. Their printed invoice says: Noticed TSB 0307-08 to replace actuator assy. and perform brake bleed procedure. Only covered to 36 mo 36,000 mi.
    So, Toyota does admit to a defective actuator, but if it doesn't start chirping before the 36,000mi/3yr warranty date, too bad for you.
    The service manager did tell me it was not a dangerous situation and that his Prius does the same thing. He seems to think it has something to do with the altitude here. He says it is common for people who come from near sea level to high altitude, 6,000 ft here, to experience this. I had just taked a trip to CA, and this started when I returned. He also said he replaced his actuator and the noise soon came back. I guess I can live with a little noise, but it kind of sucks that Toyota admits they have a defective part and won't fix it. Still love the car.
     
  18. qbee42

    qbee42 My other car is a boat

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    This is not a safety or usability issue, so it is reasonable that Toyota limits the time/distance for free repair.

    The dealer is also correct that altitude plays a part. My 2006 started chirping when I was out west climbing in the mountains. As soon as I got back to our 700 foot altitude the problem went away.

    Tom
     
  19. Patrick Wong

    Patrick Wong DIY Enthusiast

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    I agree with this. My 2004 makes that noise at 7,000 ft elevation, but not at lower altitudes. There's no safety impact, it just makes you think there's a mouse in the car... :cool:
     
  20. Emeralds79

    Emeralds79 New Member

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    I have a 2016 Prius c with the same issue. What did end up happening? My car sounds like a clown horn and the dealer heard it and cleaned my front and rear brakes and lubed it but the sound came back. The dealer said that my brakes looked fine but the noise is so annoying!
     
    #20 Emeralds79, Jan 30, 2021
    Last edited by a moderator: Jan 31, 2021
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