Brakes making clunking noise?? 2010 Prius

Discussion in 'Gen 3 Prius Main Forum' started by Lynde Lu, Feb 12, 2020.

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  1. Lynde Lu

    Lynde Lu New Member

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    Hi all!

    Just got back from driving about 500 miles in about 12 hours enduring stormy weather and lots of water on the highways now my brakes are making a very loud nonstop clunking noise while I'm at a complete stop. Anyone else have this same issue?

    Recent maintenance:
    July 2019 rotors trimmed
    August 2019 had the master brake system checked, no issues found
    September 2019 rotors re-trimmed and new brake pads
     
    #1 Lynde Lu, Feb 12, 2020
  2. ILuvMyPriusToo

    ILuvMyPriusToo Senior Member

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    Why did you have the brakes redone after only 2 months? That sounds like there was a problem well before now.
     
    #2 ILuvMyPriusToo, Feb 13, 2020
  3. Lynde Lu

    Lynde Lu New Member

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    That's what I've been trying to figure out but everyone I've taken it to says there's no problem the rotors just need to be retrimmed.
     
    #3 Lynde Lu, Feb 13, 2020
  4. Lynde Lu

    Lynde Lu New Member

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    UPDATE: Local mechanic believes it's the brake booster pump going out
     
    #4 Lynde Lu, Feb 14, 2020
  5. Higgins909

    Higgins909 Member

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    I've noticed my brakes make clunking noises when wet and was sitting for 8+ hours or so... maybe when backing out. But that's only for the first few minutes of my drive. I don't know how it could be making a constant sound when stopped. It just all wheels or just one? Maybe there is something wrong with the ABS sensor. Any lights on the dash? I've gotten ABS to go off when leaving work and the pump is pretty quiet, but the brakes themselves make strange noise. (Short and steep driveway, wet out, ...forgot what I was going to say) I kinda wonder it it's even ABS and just the pads being wet and not grabbing correctly.

    Maybe you could make a video?
     
    #5 Higgins909, Feb 15, 2020
  6. Lynde Lu

    Lynde Lu New Member

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    It's the oddest thing, not consistent only happens occasionally but this last drive it wouldn't stop since I was in rush hour traffic through neighborhoods. Only makes the sound while my foot is on the brake at a complete stop regardless if I barely have my foot on the brake pedal or if I'm pressing down hard. No ABS light or lights on the dash; I got a video of it but I'm not sure how to upload it on this form :(
     
    #6 Lynde Lu, Feb 15, 2020
  7. Lynde Lu

    Lynde Lu New Member

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    #7 Lynde Lu, Feb 15, 2020
  8. Lynde Lu

    Lynde Lu New Member

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    Anyone experience this braking noise while at a complete stop?

    https://photos.app.goo.gl/oUp9aimvWHgtyzq59

    Just got back from driving about 500 miles in about 12 hours enduring stormy weather and lots of water on the highways now my brakes are making a very loud nonstop clunking(?)/barking noise while I'm at a complete stop. No ABS light or dash lights, anyone else have this same issue?

    Recent maintenance:
    July 2019 rotors trimmed
    August 2019 had the master brake system checked, no issues found
    September 2019 rotors re-trimmed and new brake pads since the dealership stating the rotor trimming was botched
    February 2020 mechanic believes it's the brake booster pump (cost estimate 1200.00)
     
    #8 Lynde Lu, Feb 15, 2020
  9. Pluggo

    Pluggo Senior Member

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    One thing about the brake booster, it does not know or care how fast the wheels are turning. But your sound seems perfectly timed for each revolution of the wheels as you come to a complete stop. I am sorry to say it, but that points to the rotors not being true. I would say it's time for a competent shop to put new rotors on the car. The job also calls for lubricating the calipers with a dollop of the proper grease.
     
    #9 Pluggo, Feb 15, 2020
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  10. dig4dirt

    dig4dirt MoonGlow

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    Something else seems to be happening.

    Please verify if you are at a complete stop, not moving at all during that video?

    The booster is constantly cycling (low moaning bark) and the other higher pitch noise sounds like ABS/traction control.
     
    #10 dig4dirt, Feb 16, 2020
  11. Lynde Lu

    Lynde Lu New Member

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    I'm not moving at all, at a complete stop at a stop light. It doesn't happen all the time just sporadically but this past time was nonstop and kind of freaked me out.
     
    #11 Lynde Lu, Feb 16, 2020
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  12. Lynde Lu

    Lynde Lu New Member

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    After two rotor trims within a month, I wonder why they didn't just replace the rotors. The car is ten years old, I wonder if the rotors have hit the end of their lifespan?
     
    #12 Lynde Lu, Feb 16, 2020
  13. Mendel Leisk

    Mendel Leisk MMX GEN III

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    The rotors are probably fine, unless they've machined them down below min level. You can check for yourself with dial gauge (with magnetic base) and micrometer, specs in attached. And if you're not noticing pulsing when using the brakes , again, shouldn't be a rotor problem. If this noise is with the car stopped, there's no reason to be suspecting the rotors.

    I doubt it's the rotors... :ROFLMAO:
     

    Attached Files:

    #13 Mendel Leisk, Feb 16, 2020
  14. ASRDogman

    ASRDogman Senior Member

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    Getting confused..... The brakes only make noise when the car is STOPPED???
    Are you certain it is the brakes? And not something else?
     
    #14 ASRDogman, Feb 16, 2020
  15. BZzap!

    BZzap! Senior Member

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    Maybe it’s the ICE shutting down. Sometimes mind lurches a bit when it shuts down at a stop.
     
    #15 BZzap!, Feb 16, 2020
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  16. ChapmanF

    ChapmanF Senior Member

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    Any chance of just attaching an .mp3 file or such on PriusChat? The photos...goo.gl link seems to have more in mind for me than just playing some sounds.
     
    #16 ChapmanF, Feb 16, 2020
  17. Nor'easter

    Nor'easter Member

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    I hear the brake pump running way too much and something else -- maybe ABS? -- going crazy. Something is seriously amiss.

    How's the fluid level?
     
    #17 Nor'easter, Feb 16, 2020
  18. Pluggo

    Pluggo Senior Member

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    The car is making that noise while stopped? That changes everything. Forget about the rotors for now.
     
    #18 Pluggo, Feb 17, 2020
  19. Lynde Lu

    Lynde Lu New Member

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    According to the mechanic fluid levels are good and the car is in good shape. I drove during rush hour traffic yesterday to try to recreate the noise but it didn't make any alarming sounds. I wonder if the long road trip might have triggered it?
     
    #19 Lynde Lu, Feb 18, 2020
  20. Lynde Lu

    Lynde Lu New Member

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    Exactly, it's beyond wacky.
     
    #20 Lynde Lu, Feb 18, 2020
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