2010 PRIUS BRAKES 130,000 MILES NOISE

In GA USA they oughta be close to fried . Sounds like a fender liner drag. Moves at braking the wrong direction towards tire maybe

 

Post a recording? I haven't heard a turkey call in a while.

There's an issue with threads about it here, variously calling it the brake honk, or bark, or quack. Your description sounds a little like it might be that.

 

maybe debris caught between pad and rotor

 

Does this happen mainly on short trips after a rainy spell? Are the disks rusty?

 

Is the sound only heard with the car moving, or is holding the brake pedal down enough, even with the car stationary?

The way I read the first post, I didn't think the car had to be moving. Anyway, knowing that answer could help eliminate some of the possible causes.

 

'the car does not have to be powered' fwiw

 

That was the part that caught my eye.

 

yeah, that eliminates my pebble theory. must be the brake booster turkey call

 

Sounds to me like what's often called the brake honk or bark or quack. You can search this forum site for references to it.

Here's a post from last year with more of the story.

For 2010 and 2011 cars, a TSB was published about the availability of a firmware update (T-SB-0363-10). So a first thing to check is whether your car's brake firmware is already at the level shown in the TSB for your wheel size, and get the update if it isn't. I had the firmware update done on mine and it reduced the honking.

However, even cars with the updated firmware (or later model years where they came with it) can still develop the honk sometimes. In that case, if it were up to me I would take further steps, as described in that thread I linked above, and not let it go very long.

 

Mine occasionally has spells of quacking, separated by months of spontaneous remission.

 

how long have you owned it? if awhile, has the sound changed? do you hear the buzzing sound when you open the drivers door?

 

As in post #11, you can check whether your car has the updated firmware version to address the quacking.

If it already does and still quacks, or if you have the update done and then it still quacks, the next thing I would do (and not wait very long to do it) would be a long-form brake bleed.

If after that it still repeatedly quacks while holding the pedal down, a replacement actuator may be in order.

 

If all you have is quacking at this stage, you can check whether your car has the updated firmware version to address the quacking. Maybe the dealer checked that version. It would be good to make sure.

If it already does and still quacks, or if you have the update done and then it still quacks, the next thing I would do (and not wait very long to do it) would be a long-form brake bleed. I can't tell whether the dealer did that.

If after that it still repeatedly quacks while holding the pedal down, then the dealer may be right about a replacement actuator being in order.

Where they said "have the Brake Booster and Brake Actuator replaced", it would be good to clarify whether they were proposing to replace one part or two.

Technically, the Brake Booster and the Brake Actuator are two names for the same part (the top one, here).



But sometimes, people say Brake Booster when they mean the Brake Booster Pump, which is the bottom thing.

So if that's what they meant, they would be replacing two things.