Upside down brake fluid container

Discussion in 'Gen 3 Prius Main Forum' started by Frontporch, Jan 16, 2025.

  1. Frontporch

    Frontporch Member

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    I was watching a youtube video regarding bleeding the brakes on a Prius after swapping out the brake accumulator. Its pretty apparent that you go through a lot of fluid very quickly. The guy in the video said he turns his brake fluid container upside down and sits it on top of the reservoir.

    I understand the idea to provide all 32 ozs of fluid as needed, but I can't understand how that doesn't make a huge mess. Am I missing something. Has anyone done this?
     

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    #1 Frontporch, Jan 16, 2025
    Last edited: Jan 16, 2025
  2. xliderider

    xliderider Senior Member

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    Yeah, I wouldn't trust that setup, especially considering how corrosive brake fluid is on painted surfaces.

    I use a pressurized bleeding kit that holds up to 4L of brake fluid. No refilling the brake fluid reservoir if you have enough fluid in there when you start.

    They have Toyota specific adapters for these systems. I highly recommend them over using a universal type fitting.

    KZINO 4L Manual Brake Fluid Bleeder Kit, One Person Brake Pressure Bleeder with Hand Pump for Most European Automotive Master Cylinder Bleeders, Brake Bleeder Vacuum Pump Kit https://a.co/d/gJkc9Ii

    SMOTIVEPRO 43mm Master Cylinder Bleeder Adapter Compatible with Toyota and Lexus https://a.co/d/4KXws9m

    SM-G781V ?
     
  3. Tombukt2

    Tombukt2 Senior Member

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    They make an adapter that can plug into your brake reservoir but then you've got to do something about your hood being in the way there's no way you're going to go through that much fluid that's a pure farce especially if you follow the steps logically clamp off everything anyway the way I do it I'm almost prefilling the block of aluminum the whole assembly as I'm tightening up the lines from bottom to top You can see the fluid come out and pushing air at the first fitting then you tighten it then you see the fluid come with starting out of the second one You see the air bubbles that all stops and it's just fluid You tighten it and so on You end up stopping with the very top fitting on the accumulator to the side and behind the plug. So then after you get all that situated and take your relays out you get ready to start bleeding the front right by pumping and all of that so someone sitting in the car preferably so by the time you do the right front and you go to walk over to the left you top up the reservoir but the cap on the brake fluid bottle and go do the left side front. Then put the relays back in and go do the back starting on the left realizing that an electric pump is going to come on now and try to pump everything out don't have your face in the way when you hear some air let it pump for just seconds and then close it back up and have your friend off the break and then back on do it again till you get a straight stream of fluid coming out that side then do the other Go back up and check the reservoir and you will see you've not used very much at all and just want to keep it on the full marker near that right now now that you've done that turn the car off. Turn it back on see if you have a bunch of lights go forward and backwards and use the brakes and see if your pedals near normal and what have you.
     
  4. ASRDogman

    ASRDogman Senior Member

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    If you notice, the reservoir is not full, so the container is NOT full.
    If you PAY ATTENTION, you won't run out of fluid.
    And yet, will just poor out all over the place.

    Don't believe everything you see or read. (y)(y)

     
  5. Frontporch

    Frontporch Member

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    Appreciate the responses. The YouTube video was legit. A mechanic who has a video of the part replacement and one of the bleed and linear valve calibration. He said you go through most of a big bottle. He said he has done about 70 of these on different generation Priuses.
    He may have thrown an empty bottle up there for the video and that’s a good catch that the reservior has air. Lol
    Brake fluid is cheap so I don mind over bleeding to get it right. I don’t want to create a toxic mess in my garage either
    I like the idea of the tank but I don’t know if pressurizing it would have any drawbacks. Would be cool to get an initial bleed using that before I connect the battery cables and have the pump come to life.
     
  6. ASRDogman

    ASRDogman Senior Member

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    Be smart, do it the way Toyota says. You not only risk your life, your passengers lives,
    but those you will crash into when the brakes fail.....

    You'll need 2 people to do the job, BOTH should be aware of the fluid level as you do
    the procedure.....

    It doesn't matter how many times you do something wrong, it doesn't make it right.


     
  7. Frontporch

    Frontporch Member

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    You are right. I should have clarified. I wasn’t planning to skip the bleed procedure but was wondering if I could start the procedure with a full system. I won’t attempt that. Spent enough money on parts to not cut corners or take risks. I also have to believe the car would throw all kinds of dash light unless it’s done correctly
     
  8. ASRDogman

    ASRDogman Senior Member

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    I'm only saying some people need to have other people "think" they are special.
    So they will come up with all kinds of ideas to make people think they are special.
    Common sense would tell you that a full 32oz bottle of brake fliud in a full resevoir WILL
    overflow.
    There are special tanks that attach to the resevoir to hold fliud. Usually they are under pressure.
    You could rig something to attach that is sealed, then pour the fluid into it.
    It would likely be a little messy when you remove it. But you could suck out the unused fluid so
    there is less fluid spilt. And if you put rags around the resevoir the rags would soak up the fluid.
     
  9. Frontporch

    Frontporch Member

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    I will look into some alternatives. My buddy has a funnel that seals to the top of the radiator and allows you to burp out lines and has a perfect seal.

    was hoping I might stumble upon one of those for the brakes. I did notice the inside of the reservior appears to be threaded energy though the cover is a friction fit seal. Probably for a new Toyota tool IMG_8604.jpeg
     
  10. ASRDogman

    ASRDogman Senior Member

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    You don't need anything special. Just keep it close to the top. It's that simple.
    It will go down as your bleed each caliper, and do other steps. Check it during and after
    each step and you won't have a problem.
    Don't make anything harder than it is.
     
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  11. Frontporch

    Frontporch Member

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    You were right. No big deal to check the reservoir while doing the procedure. I did wind one up going through more than one of the large brake fluid containers so I am glad I bought 2 just in case
     
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  12. ASRDogman

    ASRDogman Senior Member

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    You were able to complete the whole bleed job? What tool did you use?
    How long did it take?
    Are the brakes working correctly?

     
  13. Brian1954

    Brian1954 Senior Member

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  14. Frontporch

    Frontporch Member

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    I followed this video

    and picked up the topdon topscan for about $60. Takes a little bit to setup but the procedure took about 20 minutes. I missed the last calibration step by got through the bleed without issue. Will go back tomorrow and see if I can finish
     
  15. Frontporch

    Frontporch Member

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    I went back to the car today and there were a bunch of error codes still there. I couldn't clear two, one of which was the Calibration code (maybe it was a C1345... don't recall). Anyway, I called Topdon support and they said to repeat the bleed procedure. There was no way to skip to that last calibration step.
    I went back to the prius and redid the procedure for the Air bleed after replacing the accumulator. This time I didn't have a helper. I slowly went through the prompts but didn't open any bleeder valves. When it said to pump the brakes, I did that, but released and pressed NEXT. It got to the point where it was going to do the calibration and this time I made sure I satisfied all the steps including being in the ACC (not ready) mode. It went through the calibration and eventually ended with the brake warning light and ABS light both flashing quickly. I pressed NEXT or CONFIRM to say I was done and all seems good now.

    There was a code for the brake fluid level sensor. As part of the procedure I had to disconnect that. I just cleared that code and there are no codes remaining.

    Wont have the car out of the garage for a few days. Was adding an oil catch can and that is not done.
     
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  16. Frontporch

    Frontporch Member

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    Finally finished the Prius and to my horror it would not start. There were lots of lights on the dash. Put on the battery charger and let it charge up the 12v and after a while it started and drove fine with one exception. There was some shaking when the motor first fired up. Hopefully not a head gasket shake but will see if it repeats. I’m hoping that it had something to do with the eGR work I did or the battery running low several times while it was stuck in the garage
     
  17. Grit

    Grit Senior Member

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    Leak down test, if it passes, change parts. If it fails, leak stop in the radiator and hand the keys to carvana.
     
  18. Bill Norton

    Bill Norton Senior Member

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    The shaking is from a cylinder or two trying to pass water.
    That water came from a pool of mixed oil and moisture from the PCV system that was lying at the bottom of the intake manifold...
    Or a bit of coolant in a cylinder or two from a slowly failing head gasket.
    Test for 'combustion byproducts' in the coolant.

    A leak down test only puts ~15psi on the coolant to push it through a fault in the head gasket.
    Combustion pressures are incredibly high and push through into the coolant.
    If you lucky {unlucky] you may see coolant drops forming at the failure point on the head gasket, but it will take time to show up, sometimes.

    "EGR work or low battery" has nothing to do with a shaky start up.
    And Mumms the Word. :sneaky:Xnay on the Asketgay.:whistle:
    Buyer beware....

    I'm ashamed to say that's how I fixed one of my Gen3's when it got the chronic head gasket failure.
     
  19. Frontporch

    Frontporch Member

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    this morning I started up the prius again and no shaking. It sounded like a cylinder or two wasnt firing when I first started the car after sitting for a few months. I am going to keep my eye on the fluid level and see if this shaking occurs again.

    Is the typical test for combustion in the fluid test good for G3 prius? I thought I had read somewhere that it wasn't very effective.
     
  20. Mendel Leisk

    Mendel Leisk Senior Member

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    Do you mean the "block test", where coolant is drawn up into a tube with an indicator solution, and if it changes color it's due to carbon monoxide in the coolant? That is not how gen 3 head gaskets typically fail, it's usually coolant leaking into combustion chamber, so: no.

    More telling is borescope inspection with the coolant system pressurized, or leak-down test.

    What's the miles on it? Has the EGR system been cleaned, and if so, at what miles?