Brake bleed after rear caliper replacement

Discussion in 'Prius v Care, Maintenance and Troubleshooting' started by ksyolsen, Dec 6, 2025 at 1:07 PM.

  1. ksyolsen

    ksyolsen Junior Member

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    Hey, all, I just replaced both rear calipers as they were sticking and one of the boots was torn. I disconnected the 12 V battery to prevent the pump from running and now I am trying to manually pump bleed the brakes using a hand pump brake bleeder. There is fluid coming out, but it is very aerated and I can’t seem to get straight fluid through without a bunch of air.

    I have been pumping for about 30 minutes going between each side and not really getting anywhere.

    What should I do?


    iPhone ?
     
  2. ksyolsen

    ksyolsen Junior Member

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    Here is a video of what I’ve been seeing for the past 30 minutes:


    All bolts are torqued down, new banjo bolt and crush washers.

    Reservoir is topped up.

    I’m thinking based on this video:


    I may reconnected the 12v and have someone press and hold the brake pedal and I’ll crack the bleeder and use the vacuum bleeder to capture the fluid. Maybe that will force more through?

    If all else fails I suppose I can have it towed to the shop or the dealership and have them bleed it. Since I already saved the $ doing most of the work myself. Just feels like I should be getting the air out by now.


    iPhone ?

    [mention]rjparker [/mention] [mention]Mendel Leisk [/mention]maybe you two have some ideas of why it seems like the air is never ending? Haha
     
  3. ksyolsen

    ksyolsen Junior Member

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    So I weighed my options. Either spend more time trying to figure it out myself possibly making something worse. Or just having it towed in which would cost me some more money but it’s still about $2000 less than what I would’ve paid having the calipers replaced by someone else. So I already saved a major expense.

    So I figure it’s worth the couple hundred bucks for the brake bleed/flush to have it done properly and without my time and hassle. The tow should be free since it’s less than 5 miles from me.

    They said they should have it done by Monday or Tuesday.

    I feel pretty good about just having them do it because they should be able to do it with a scan tool and do the whole proper procedure that I wouldn’t be able to do here.


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  4. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Try going through the non-Techstream brake fluid replacement procedure? Can you enlist someone who can pump the brake pedal when needed? There's a link in my signature (on a phone turn it landscape to see signatures)
     
  5. ChapmanF

    ChapmanF Senior Member

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    You're using a vacuum-sucking tool for bleeding, and it's not uncommon for the threads around the open bleed screw to admit air, so whatever fluid you're able to suck out is probably getting foamed right there at the bleeder.

    That's one of the reasons a vacuum-sucking tool isn't any of the ideas for brake bleeding you find in the repair manual.

    You can get a scan tool to complete the proper bleeding procedure for probably no more than $60 or so (if you have a smartphone you don't mind loading an app on), or you could just stick with the idea of a tow to a shop that can do it right, which isn't a bad idea at all.

    There is a non-scantool "fluid replacement" procedure in the manual, but it's only for fluid replacement (just like it says), not for bleeding. You have opened the system and replaced calipers, so bleeding is in order.
     
    Brian1954 likes this.