Brake Actuator keeps activating fully

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Diavolo, Apr 23, 2026.

  1. Diavolo

    Diavolo New Member

    Joined:
    Apr 23, 2026
    1
    0
    0
    Location:
    Arizona
    Vehicle:
    2005 Prius
    Model:
    N/A
    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
  2. JC91006

    JC91006 Senior Member

    Joined:
    Nov 10, 2013
    16,923
    8,634
    0
    Location:
    Los Angeles, CA
    Vehicle:
    2008 Prius
    Model:
    II
    You should just go and get your brakes checked. Possibly the glide pin is sticking
     
    #2 JC91006, Apr 24, 2026
  3. Tombukt2

    Tombukt2 Senior Member

    Joined:
    Nov 29, 2020
    13,753
    2,491
    0
    Location:
    Durham NC
    Vehicle:
    2009 Prius
    Model:
    Base
    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
  4. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    28,539
    18,883
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    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
(You must log in or sign up to post here.)