2001 Malibu

Two weeks ago my 2001 chevy malibou started making a low humming noise but since we put 80 miles a day on the car it has turned into a loud humming noise. Real loud. But no grinding yet. Took off front wheels rotars and pads r like brand new when I rotated rotor there was qiute a bit of tension and a scraping noise coming out both sides near the bootcar runs great no transmission problems but its definitely in the front end