Hate those none insured you know who types
ABS light could be numerous things, i.e Wheel bearings (As i had this fault on rear bearing) faulty ABS sensor on one of the wheels or worst of all the ABS control unit. Which to my understanding is very rare to fail. A bad fitting wheel bearing caused my ABS light to come on over 50mph and the car made a grinding noise.
ABS sensors can be removed and cleaned which can usually fix the problem if its one of the four. ABS control unit fail would show on VAG com. Only other thing could be your master brake cylinder is knacked which may affect your ABS. Im not sure on that so search for that.
LCD screens often die on all Audi display huds, just a matter of when I believe. Mine is crap to look at during a bright day, comes to life on the night tho.