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Brake issues rear shoes and abs module issue bleeding brakes

Discussion in 'Gen 2 Prius Technical Discussion' started by Austen2007whiteprius, Jun 12, 2023.

  1. Austen2007whiteprius

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    So I changed abs module due to codes and warning lights also had some strange stuff with brakes going on so I got a used one off eBay was supposed to be tested. Im praying it wasn’t a faulty module. However I had atempted to change rear drums and shoes and taking apart passenger side shoes I realized I was too over my head so I reassembled them to the best of my abilities and put the new drums over the old shoes. I bled the brakes all the way from furthest from master cylinder to closest, everything was going smoothly until the final tire, seems like the air bubbles have been coming out infinitely, I have been bleeding for hours. I did mess up bleeding process at first by not having tube in fluid, flooding the system with air, im wondering is it possible there’s that much air where it takes hours to bleed out or is something else likely going on?
     
  2. ChapmanF

    ChapmanF Senior Member

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    First question: good on you for getting the codes, so what were they?

    Next question: how have you been bleeding?
     
  3. Austen2007whiteprius

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    Codes were
    Abs codes c1241 c1256 c1344 c1391

    Method for bleeding was just turn car into accessory mode on take off cap to master cylinder and open bleeder valves going from tire furthest to master cylinder reservoir, last tire being passenger front tire, that’s the one that keeps pushing out air bubbles
     
    #3 Austen2007whiteprius, Jun 13, 2023
    Last edited by a moderator: Jul 5, 2023
  4. SFO

    SFO Senior Member

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    I learned the hard way to always avoid accessory mode, as it drains the 12v supply rather quickly. Either the car is in "ready mode" or it is off.
    Do you need help finding the factory repair workups for the above obd2 codes?
     
  5. Austen2007whiteprius

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    I’m just wondering how to properly bleed brakes people are saying you need a scan tool after abs replacement but I can’t find a good instructional video about how and what scantool or why it won’t work without one etc
     
  6. ChapmanF

    ChapmanF Senior Member

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    The reason it won't work without one is the brake actuator has a bunch of computer-controlled valves inside it and they're not all open all the time, and it doesn't matter how you try bleeding the air out, what's behind valves that aren't open isn't gonna come out. When you use a scan tool and kick off the bleeding procedure, it opens the right valves in the right sequence so you can get all the air out of all the places.

    Some people will use Toyota Techstream on a laptop. Others will look through mr_guy_mann's review thread of other apps and scan tools, and choose one of those that can do the job.

    Gen2 OBD2 app review | PriusChat
     
  7. Pubrica

    Pubrica Junior Member

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    I did this way on my car "05 few month ago, raise a car on front and first sucked old brake fluid off in tank and fill up with new b/fluid full.
    Open breather fitting on left(driver side ) rear with fitting hose(clear tube) on container and watch the fluid comes out with gravity, takes few minutes hopefully. you did not see any bubble in container while fluid come out. Then closed close the bread /fitting and move to front left side (driver), doing same way again on passenger side. You will have solid tight on the brake pedal. then, adjust rear brake shoe with rotate wheel or tire. Check the brake fluid in tank and wash out with water if brake fluid drop or spread on to body accidentally. Good luck.
     
  8. Pubrica

    Pubrica Junior Member

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    Additionally, old B/fluid comes out with AIR bubble first time and will see later clean flesh with no air in B/fluid.
     
  9. ChapmanF

    ChapmanF Senior Member

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    As long as everyone remembers that this cannot get air out of the underhood components from the passages that are valved off. Only by using a scan tool that causes those valves to be opened in proper sequence can those passages be properly bled.
     
  10. Tombukt2

    Tombukt2 Senior Member

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    Okay so to be clear what I was sent to bleed my brakes from a member here don't remember who don't see the post was the copy from the factory manual that goes from page BR3 to about BR19. On the main page it states bleeding without the intelligent tester may result in the air not being completely bled. As this can result in an accident be sure to use the intelligent tester for air bleeding and then it goes on with the instructions and removing the relays I did all of this without the intelligent tester in the order provided and it worked pretty much flawlessly and perfectly My brakes have been working perfectly for six seven months now and I followed these instructions more or less to the letter and that is from BR3 to BR19 and the factory manual I just didn't at the time have the intelligent tester and apparently there are many back in the day of this generation 2 there were a few people making intelligent tools that could bleed so it wasn't limited to tech or TIS one or two which is Toyota software I finally found the 16 pages that I printed from this list to do my car which is done and been on the road for many moons now done just like this without the intelligent tester to be clear. Good luck
     
  11. dolj

    dolj Senior Member

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    So, you're quoting the repair manual that says you need to be sure to use a scan tool (capable of commanding the brake bleed sequence) to properly bleed out the air from the system, but then stubbornly continue to argue that you don't need to do this.

    Who to believe? The people that made the system, or some random guy who got lucky? (n) o_O :whistle:
     
  12. Tombukt2

    Tombukt2 Senior Member

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    Listen man I don't overthink things too much but Toyota builds vehicles that go all over the world like Africa One of the most popular trucks in Africa is a Toyota and it can be fixed with paper clips out in the wild. On the first page of the manual on BR3 it says May need to. Whatever I take that to mean that skillful people out in the wild can make this happen like other Toyotas etc etc That's what I take that to mean You can read into that whatever you want It also describes the scan tool in a different manner than TIS which TIS is the software that all of y'all are talking about all the time actually it's TIS2 now I think might even be a newer version out that wasn't out when the Gen 2 was made if I'm not mistaken that came out of tab later than the car actually I do believe but don't hold me to that I bled my car in the wilds of North Carolina without the scan tool I have t i s right here on the proper toughbook computer I didn't even think to grab it and take it out to try the bleed because so many other people have had trouble making it work when they're paying for it so I wasn't really up on dragging the computer out to the car to simply bleed the brakes so I used BR3 to BR19 to do that and where it has the steps in the block and where the computer's asking you wouldn't want what you want to do next I was just doing that next by the instructions I don't need to see a screen and push yes I just pull the relay and open the whatever was going on and it all worked I have no lights breaks are working fine and that was my end game I'm just trying to help other people do the same I don't even know what scan tool was used in '04 when this was written The DLC 3 or whatever the heck it is I don't have one and apparently for the Gen 2 there's a bunch of these scan tools that can do this I guess the autel and a few others. So that's how I got it to work That's my story I'm sticking to it If it didn't work I would tell you so and I would tell you I went in the house hooked up TIS and followed all the prompts to be honest with you I don't even know how to bring up the brake bleeding in TIS I'm going to have to learn how to do that to fool with these two silly Gen 3's I have sitting here that are both going to need whatever you want to call the parts. Funny thing all the lights telling my wife that her car needs an ABS accumulator pump whatever the heck It's not a wheel code it's low pressure they just all turned off yesterday like a 4th of July present and haven't come back on in 4 days what gives nobody knows nothing's unplugged cars are perfect condition full of brake fluid everything's been working fine for years. Oh well