For a while now there has been a slight shudder when I brake.
It’s getting really bad as of today.
I don’t know if it’s coming from the front or the rear.

At around 65-85mph, if I start to brake i get this sound, hard to explain on here.
The wheel does not shake but today, There is a bit of a shake now.

It’s a loud juttering sound with Alittle wheel shake.
I’m thinkng now the front right wheel.

Any idea? I was thinking some front end suspension bush is bad?
I’m alittle but nervous to drive it now.

 

The first two culprits to check for are pad deposition (usually incorrectly described as "warped discs") and a stuck caliper slide pin.
Both are relatively common on the XF.
You would need to take the car to a brake specialist to check for pad deposition, and they could easily check for a stuck caliper slide pin at the same time, or if you are even slightly handy with the spanners you can check the slide pin(s) yourself.

 

here a video I took of that sound, a few minutes ago. you need to have a good set up speakers to really hear it. its bassy