Brake pedal squeak

[Primalzer]

Ok, I noticed a brake pedal squeak that's definitely inside the car. I'm assuming it has nothing to do with the TSB as my brakes are basically brand new all the way around and the sound has persisted throughout the change. Humidity makes it worse, but it's fairly prevelant all the time.  I've heard everything from just a rubber/metal noise to possible brake booster issue. Is there another way to diagnose the brake booster? My ESP would cover a booster, but if they check out the squeak and it's not the booster, I'm gonna get charged up the butt.

Thoughts?

 

[FoMoCoSHO]

I just had this issue on the Lincoln and it was the booster.

On the last 1/3 of travel it felt like the pedal was rubbing which I only noticed in a quiet cabin when I was listening for the noise and not driving.

 

[SHOdded]

Sometimes it can be a failing master cylinder leaking into the booster causing the booster to fail.  Does not sound like the case here, but at least 1 member had that situation happen.

 

[Primalzer]

Last time I had the car in for brakes, the master cylinder was bench tested, and tested out fine. But I'm not sure they looked at the booster.