ive changed the brake switch of my ML320 but beeping sound still on when driving on 1998 Mercedes-Benz ML320

previously holding at cruising speeds found front wheel speed sensors broken replaced with new ones. holding of wheels not noticed after but beeping sound of ESP,ETS,and Handbrake lights keep flashing athigh speeds but on slow speeds all is well.Advise on my next step. Am an upcoming technician(student)

Asked by for the 1998 Mercedes-Benz ML320
seek diag and est