Brake pressure becoming firmer.

[ocnav]

Heyo
So yes, to further clarify - when having to brake hard (say the bottom of a steep driveway) it feels I have to press the pedal further than normal and then pressure firms up a lot more than normal as well.
Under normal braking everything feels just fine. It started about a year ago.
I swear I'm not imagining it - this is the 3rd 380 I've owned over 7 years and the brakes have always been one of my favourite things about these cars.

I've had Mitsub replace the brake fluid but made no noticeable difference and the car is at 120,000kms.

Everything I research talks about the common brake problems like the pedal sinking or being slow to rebound, so I'm finding it difficult to get ideas.
The only other time I've experienced this was when driving a 15ish year old car a few years ago. I just thought it was just a problem with old cars but my car ain't old

Any thoughts anyone?