2013 Prius Brake actuator/pump issues - is DOT4 Brake Fluid an easy fix for this problem?

Discussion in 'Gen 3 Prius Technical Discussion' started by Yerbluez, Dec 29, 2021.

  1. Yerbluez

    Yerbluez Junior Member

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    Hoping someone can make a suggestion as to what I should do to avoid a $4k brake master cylinder repair job. I've searched this sub already but can't seem to find an agreement on what to do. I have a 2013 Prius and the ABS brake pump (I'm assuming) is starting to turn on way too frequently. I have read that this can eventually lead to a failure of components of the brake system and a new master cylinder is required.

    Is there any somewhat inexpensive fix I can do now to prevent this from getting worse? I read someone had luck changing the brake fluid to DOT4 and it seemed to fix the issue. If there is no reasonable fix and this isn't covered by a recall then I may have to look into selling my beloved Prius. 3-4k is too much money to spend on this car. Does anyone else have any recent experiences with this?

    Thanks in advance!
     
  2. bisco

    bisco cookie crumbler

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    there may be an extended warranty, but you need a trouble light/code.

    i've read that changing the fluid can sometimes help reduce noises in the valves, but nothing about repairing leaks.
     
  3. ChapmanF

    ChapmanF Senior Member

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    That's probably getting the cause and effect shuffled a little bit.

    Failure of components inside the master cylinder assembly is most likely the reason your pump is cycling so frequently. (By the way, how frequently is "frequently"? If the leaking is fast enough, you can probably hear it with a mechanics' stethoscope, and know for sure which of the two assemblies the leak is in.)

    So it is probably too late to find a way to not need the actuator assembly.

    It might be possible, though, to get that sorted before the pump has also been worn out from having to run so often, and at least avoid having to replace both. (On top of being more money in parts, that would be more labor; access to the pump is a bear.)
     
  4. rjparker

    rjparker Senior Member

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    Doing a brake flush can fix it for a few days by eliminating nitrogen or air in the lines. Then it will return.
     
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  5. Mendel Leisk

    Mendel Leisk Cloud Watcher

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    Repair of failing brake components (I won't even attempt to name those components) aside, the spec'd fluid is DOT3. Also, while Toyota USA says nothing on the subject, Toyota Canada says to replacef the fluid tri-yearly or 48K kms, whichever comes first.
     
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