What is wrong with my oldsmobile aleros breaks?

I have a 2002 Oldsmobile Alero GLS coupe. When I use the breaks even at low speed on dry pavement, the anti-lock activates and makes a growling noise. Then my traction control, ABS and service vehicle soon lights come on. After that, the anti-lock dosn't activate and the breaks work good. What is causing this?|||Have your ABS sensors checked, bad sensors will do this EXACT scenerio..|||have you checked your brake fluid? sounds like it could be that or an electrical problem. maybe you should take it to a dealer.