1. Attachments are working again! Check out this thread for more details and to report any other bugs.

Brake master cylinder

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by Jay94501, Jun 11, 2022.

  1. Jay94501

    Jay94501 New Member

    Joined:
    May 10, 2022
    9
    2
    0
    Location:
    Cali
    Vehicle:
    2016 Prius
    Model:
    Two
    Today I went to check if my brake fluid is good or bad with the fluid pen but I notice after I dip the pen into the master cylinder I hit some sort of plate. The plate is exactly between the max and minimum level. My brake fluid was right in the middle of the level. The plastic piece in the middle is not like the 3rd Gen where you can remove it. So right now I scratching my head because usually you can just dip the pen in the fluid and check it.
     
    #1 Jay94501, Jun 11, 2022
  2. Jay94501

    Jay94501 New Member

    Joined:
    May 10, 2022
    9
    2
    0
    Location:
    Cali
    Vehicle:
    2016 Prius
    Model:
    Two
    I have a 4th Gen Prius
     
    #2 Jay94501, Jun 11, 2022
  3. Doug McC

    Doug McC Active Member

    Joined:
    Feb 15, 2022
    997
    374
    0
    Location:
    Midwest
    Vehicle:
    2022 Prius
    Model:
    XLE
    Is it possible you are hitting the removable plastic screen in the fill neck?
     
    #3 Doug McC, Jun 12, 2022
  4. Jay94501

    Jay94501 New Member

    Joined:
    May 10, 2022
    9
    2
    0
    Location:
    Cali
    Vehicle:
    2016 Prius
    Model:
    Two
    It's not like the circle plastic piece in the 3rd Gen. It's like a plate in the middle that I think you cannot remove out of the bottle neck.
     
    #4 Jay94501, Jun 12, 2022
  5. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    23,808
    15,467
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    Couple ideas:

    Could you fish any sort of skinny tube down in there, and use some kind of squeeze bulb to draw up enough fluid to test?

    Or would a test strip be easier to poke down there than the electrical gizmo?

    [​IMG]

    Or, crack open a bleeder at a wheel and take a small sample that way, test it, and add a bit of fresh fluid at the reservoir (if the test result is good and you decide not to replace it all).
     
    #5 ChapmanF, Jun 12, 2022
  6. Jay94501

    Jay94501 New Member

    Joined:
    May 10, 2022
    9
    2
    0
    Location:
    Cali
    Vehicle:
    2016 Prius
    Model:
    Two
    I'm gonna take a picture inside of the Bottle neck probably today and upload it! Thanks for the reply
     
    #6 Jay94501, Jun 12, 2022
    Doug McC likes this.
(You must log in or sign up to post here.)