Brake Actuator keeps activating fully

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Diavolo, Apr 23, 2026 at 7:59 PM.

  1. Diavolo

    Diavolo New Member

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    Howdy there. This all randomly started happening one day, but when I go to brake, the actuator engages fully and locks the wheels, and then when I release the brake, the actuator runs for a bit. No lights on my dash, but this is undrivable. Where to start? I have techstream.
     
    #1 Diavolo, Apr 23, 2026 at 7:59 PM
  2. JC91006

    JC91006 Senior Member

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    You should just go and get your brakes checked. Possibly the glide pin is sticking
     
    #2 JC91006, Apr 24, 2026 at 2:09 AM
  3. Tombukt2

    Tombukt2 Senior Member

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    Wheels of ground is it all 4 gra bing or just rears? You should be able to press almost half travel without engaging hydraulic fluid.IE regen only . Drive on street in front of house and pull B no pedal what happened have mfd on energy mode do you see regen colors on screen pulling B???
     
    #3 Tombukt2, Apr 24, 2026 at 6:55 AM
  4. ChapmanF

    ChapmanF Senior Member

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    I would start by trying to get it to relearn the linear solenoid offsets.

    The linear solenoid valves in the actuator are supposed to be able to linearly apply different amounts of fluid pressure, not just be on/off.
     
    #4 ChapmanF, Apr 24, 2026 at 7:21 AM
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