Brakes issue: code C1252 and C1256

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Professorman, May 28, 2023.

  1. Professorman

    Professorman New Member

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    I have a new to me 2010 Prius w/240k miles.
    I have a constant beeping, brake light on, and codes C1252 & C1256.

    My brake light came on and no longer working properly. Sometimes it works, sometimes it’s hard to press like manual braking, and sometimes it grabs when I’m pressing it hard. My regen is working.

    What can I start as my troubleshooting diagnostics?
     
    #1 Professorman, May 28, 2023
  2. bisco

    bisco cookie crumbler

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    #2 bisco, May 28, 2023
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  3. Professorman

    Professorman New Member

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    Thank you. The diagnostics is very helpful. I am now pretty sure I need the brake master. I am testing if I need the pump as well.

    What are the pros and cons to buying used vs new?
    What other things do I need other than the parts? Do I need other gaskets?
    How much brake fluid do I need for the brake bleed process?

     
    #3 Professorman, May 30, 2023
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  4. bisco

    bisco cookie crumbler

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    unfortunately, idk any more than you do, but i'm good at searching and learning.


    watch

    watch

    search


    many here have gone with salvage units. the difficulty is not being able to know if they are working, and tbh, they all have this problem, so at some point they are going to fail.
    hopefully, a new unit would be upgraded, so you have to decide which is best for you.
    there are tons of threads here with good advice:

    gen-3-known-brake-problem-outside-of-the-zjb-program-terms.235256
     
    #4 bisco, May 30, 2023
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  5. Mr. F

    Mr. F Active Member

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    The possibility of introducing contaminants into the brake fluid.
     
    #5 Mr. F, May 30, 2023
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