2011 Prius making the noise of leakage when brake released.

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Imrand, Apr 23, 2020.

  1. Imrand

    Imrand Junior Member

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    Hello everyone i have a interesting story to tell you and looking for a good answer.
    My prius gen 3 started giving a noice of leakage when i release brake. I tried hard to find it but no luck. One day I pulled out master cylinder for inspection nothing wired. Then I removed abs pump and noticed there were rubber rings which were pressed hard and looked like leak of pressure. I put some silicone and fitted it back now noice is reduced.
    Question: there was a plate in between pump and master cylinder is it replaceable ?
    2nd earlier drive was very hard engine was taking too much power before this fix. Now its extremely soft how it can be.
     
  2. ChapmanF

    ChapmanF Senior Member

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    Are you saying "master cylinder" to mean the assembly on the top in this drawing, and "abs pump" to mean the assembly on the bottom?

    [​IMG]

    Can you describe further the "plate" you have mentioned?
     
  3. Imrand

    Imrand Junior Member

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    This one is placed in between master cylinder and abs control module
     

    Attached Files:

  4. ChapmanF

    ChapmanF Senior Member

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    So what you're saying is you disassembled the brake booster assembly.

    That's just sold as a unit.
     
  5. Imrand

    Imrand Junior Member

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    As u can see in photo there are rubber ring seals on this plate they are leaked. So what i did was put some silicone around them and installed it again now my brake is working batter not 100%. All other parts on unit are perfectly fine. I have to wait till lockdown is over to replace the complete unit. I just want to knew if anyone else have fixed it.
     
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