Brakes making clunking noise?? 2010 Prius

Maybe it was just some quirky thing that happened. If it's a real problem, it'll come back. I wouldn't worry about it until it does.

 

Your video was clear for me. There is some significant issue with your brakes that I would address in the near term if it were my car. I am going to guess that there is an internal leak in your brake hydraulic system that makes it incapable of holding normal pressure in some circumstances.

IIRC, there's a recall that affects the brake system on most 2010 cars (built before May 2010 (?)). I suggest you seek info from Toyota and see if your car is among those affected. You can start here Lookup Safety Recalls & Service Campaigns.

 

Your video should be all the evidence you need to show Toyota that there is indeed a problem.

 

I have the same issue, check it out in the thread video : Prius brake (squawk/bark/honk/grunt type noise from brake accumulator/booster/actuator) severity | PriusChat

You can see the same type of noises in my prius (2011 model)

I found 2 things:
1. Brake accumulator could be going bad (air keeps getting in, system is not able to hold the pressure)
2. OR there is air in the system that needs to be bled out (if brake booster pump is good, then no new air gets in, otherwise GOTO issue #1)

I have scheduled brake system bleed to see if it would make it go away, if not: I was told that air is somehow getting in the brake system and during purging it makes this noise and the pressure needed is not being retained.

 

My 2012 Prius C was doing that sound before 4 brakes lights came on, now i don't have regenerative braking. Today i was driving the car normally and the 4 lights turned off, regenerative braking was working again, but after getting home they turned on again. I was going to replace the ABS actuator but i will wait more and see what happens, it could be that since i live in a quite high altitude place, air bubbles are forming in the brake lines causing such noise, though the ABS actuator motor runs constantly so maybe it's going to leave me soon.

 

My 2013 makes this exact sound. Happens only when fully stopped, even when the ignition is off. I have found various threads regarding this problem and I hope Toyota recognizes there is an issue. Lynde, did you ever resolve your problem?