Brake thumping noise, audio included

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by MattFL, Mar 26, 2016.

  1. MattFL

    MattFL Member

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    On our 2008 Prius, while the brake assist pump is running I get a steady thump-thump-thump-thump noise, as shown in the video below. If you put your foot on the brake the noise stops. The brakes operate fine and there are no warning lights on. Does anyone have any idea what this might be? It's coming from the passenger side of the car, and oddly it's loudest under the car near the back seat. 86,000 miles on the car.

     
  2. bisco

    bisco cookie crumbler

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    wow, that's a lot of noise. not sure if it's the same as the honking/quacking threads that turn out to be the brake actuator. have you checked them? i think they say if you can live with the noise, the brakes work fine.
     
  3. valde3

    valde3 Senior Member

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    It sounds like brake actuator is actuating. Are there any fault lights on?
     
  4. MattFL

    MattFL Member

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    There are no fault lights on. Is there any other way to test it?
     
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