Hey all, 2012 G37S sedan. There's a creaking sound when I push the brake pedal, usually when the car is cold, though it's 90 degrees here so not exactly freezing. Anyhow the noise is audible in the cabin but it's even louder outside the car, maybe coming from the brake cylinder area. Any ideas?

 

It is the spring inside the master cylinder. It gets contorted out of place and starts making thoses creaking noises when you depress the brake pedal. Local dealership replaced mine under warranty.

 

I had the same noise and I narrowed it down to my brake booster. Got it replaced under warranty.