Master Cylinder Brake Fix with Techstream

Discussion in 'Prius v Care, Maintenance and Troubleshooting' started by daniel hoang, Sep 19, 2025 at 10:56 AM.

  1. daniel hoang

    daniel hoang Junior Member

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    Jun 10, 2019
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    Location:
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    Vehicle:
    2014 Prius v wagon
    Model:
    Five
    Just posting to let you guys know of what I experienced. Might help some People out there. So I got the dreaded Faulty accumulator leak. My symptoms was it would buzz every 5 secs car still brake and drove just fine. I had 160k miles and it's 10 years old so I missed the extended warranty date. I decided to only replace the master cylinder. I bought it brand new for 900 bucks from a toyota online dealer. Installation was easy, but techstream was nightmare. It would throw errors at the stroke simulator part. Also battery was low. My fix and this worked for me and my setup. I had to use jumper cable from another car and keep it running while doing the steps (this kept the battery at the correct voltage)
    1. First I would do the Air bleed (replace accumulator Option).
    2. then I would do the air bleed again but use the Air bleed only (I just skipped all the steps, just make sure you got all the bubbles out. it got through all the steps successfully for me).
    3. I would reset the memory
    4. I would go in ecb submenu
    5. do Linear Valve offset (if the lights are flashing like it says in the instruction and you hear the pumps working then it's not working correctly)
    6. clear any dtc codes. and should be good from there.
     
    Brian1954 likes this.
  2. rjparker

    rjparker Tu Humilde Sirviente

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    Vehicle:
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  3. ChapmanF

    ChapmanF Senior Member

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    Location:
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    Vehicle:
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    Model:
    IV
    Yes, the bleed procedure can take a while, and it's important to make sure the 12-volt battery does not get too drained before the procedure is complete. At a dealer they'll have a gadget like this to support the 12-volt battery during any lengthy procedure.

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