Re: brakes don't work
I have the same problem, yet with a T-LCM via USB (I use a Fanatec wheel base instead). Thrustmaster support ensures that USB connection automatically enables LCM mode.
My problem is: the brake is only sensed at ~50% of the pedal travel (first half ignored), and brake-specific settings in F1 such as linearity and saturation don't improve the full-range sensing.
F1 23 is the only game where the problem shows. ACC and iRacing correctly manage the brake pedal in my direct experience.