SATURN SL2 BRAKE NOISE

I Have A 1999 Saturn Sl2. When I Press The Brake Between 15 And 40 Mph, There Is A Loud, Almost Plastic Sounding Rattling Coming From What...

Don't Think It Has Anything To Do W Master Cylinder Because I Can Still Brake. I Think The Knock Is In The Abs System. I Removed The Abs...