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Brakes going soft

Discussion in 'Prius v Technical Discussion' started by Wolfgang Langlois, Aug 10, 2023.

  1. Wolfgang Langlois

    Wolfgang Langlois Junior Member

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    2013 Prius V, 78 000 miles, the Brakes still working fine but I have to press the pedal all the way down when I start the car, then while driving the brakes pedal goes back to normal. Checking with Dr Prius OBD I get the code that the hybrid battery has to be replaced. After applying the erase error codes with Dr Prius the brakes work fine, but go back to being soft after a short time.
     
    #1 Wolfgang Langlois, Aug 10, 2023
  2. Tim Jones

    Tim Jones Senior Member

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    Pretty low miles for a bad Traction Battery. Does the brake pump run more than usual?
     
    #2 Tim Jones, Aug 10, 2023
  3. Air_Boss

    Air_Boss Senior Member

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    Failing or leaking ABS pump/accumulator?
     
    #3 Air_Boss, Aug 10, 2023
  4. rjparker

    rjparker Tu Humilde Sirviente

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    Are you sure its a soft pedal versus poor braking? These cars are brake by wire so normal rules for direct hydraulic brakes don't apply.

    Dr Prius may not be reading brake codes. No warning lights like VSC, etc?

    I would take it to a dealer for diagnosis given brakes are important and gen3 has issues with brake boosters.. Odds are a 2013 is beyond the ten year limit of this program but maybe...

    IMG_2550.jpeg IMG_2551.jpeg
     
    #4 rjparker, Aug 11, 2023
  5. Wolfgang Langlois

    Wolfgang Langlois Junior Member

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    Thanks for all this great advice, especially the ten year program. I will take it to the dealer to get error codes diagnosed.
    I need to add all the
    Lit up symbols:

    Brake

    Brake system warning light

    ABS warning light

    Slippery road Symbol
     
    #5 Wolfgang Langlois, Aug 14, 2023
    Tim Jones likes this.
  6. Tim Jones

    Tim Jones Senior Member

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    #6 Tim Jones, Aug 14, 2023
  7. Tim Jones

    Tim Jones Senior Member

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    If not covered you may want to decline their diagnoses.... and get techstream on amazon.....
    But I can see a dealer diagnoses might be better for you....... use caution........$$$$$
     
    #7 Tim Jones, Aug 14, 2023
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