clunk noise from stepping and releasing brake pedal

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by ernie1, Jun 30, 2011.

  1. ernie1

    ernie1 Junior Member

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    I get a clunk noise when stepping on and releasing the brakes occasionally but not always. This occurs even with the engine off and the vehicle stationary. I also hear some other noise like some sort of vacuum servo thing is happening.
     
    #1 ernie1, Jun 30, 2011
  2. arewethereyet

    arewethereyet Junior Member

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    #2 arewethereyet, Mar 10, 2012
  3. ewilke

    ewilke Junior Member

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    its the hill assist it holds the brakes for a second if you want on a steep hill.
     
    #3 ewilke, Mar 10, 2012
  4. arewethereyet

    arewethereyet Junior Member

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    Is it always on? Happens on flat ground for me.
     
    #4 arewethereyet, Mar 10, 2012
  5. ewilke

    ewilke Junior Member

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    it is activated by pushing the brake down hard after you stop.
     
    #5 ewilke, Mar 10, 2012
  6. Jimbo913

    Jimbo913 Junior Member

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    My 2006 with 125k started making a clunk sound which could be felt under your feet when first applying the brake. It almost felt like a rod on a cam releases when you touch the pedal and it contacts something with a "clunk".
    It seems like it started immediately after a panic stop where I really mashed the pedal. The clunk also seems random and doesn't happen every time the brake is applied but it happens 80% of the time and 99% the first time after the car is started.

    The car now has 128k miles on it with no service in between the time the clunk started, and for the last 500-1000 miles, the clunk has disappeared.
     
    #6 Jimbo913, Jul 7, 2017
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