WHEN I APPLY MY BRAKES AT LOW SPEED THERE IS A ROTATIONAL NOISE IN THE REAR END. I FOUND OUT ON MY LAST RECALL VISIT THAT GM KNOWS OF THIS ISSUE AND SENT OUT A DOCUMENT, #PICA DATED 11/19/2012 SAYING THEY WERE WORKING ON THE PROBLEM. I HAVE CONTACTED GM TO SEE IF THEY HAVE RESOLVED THIS ISSUE. THEY REPORTED BACK TO ME, AFTER 3 WEEKS OF PHONE CONVERSATIONS AND TALKING TO MULTIPLE PERSONS, THAT THE REAR DRUMS HAVE TO BE RE-DESIGNED AND THAT THEY ARE WORKING ON THE FIX. I ASKED FOR A LETTER OR EMAIL SHOWING ME THE DATE MY CAR WILL BE FIXED AND THAT IT IS NOT A SAFETY ISSUE EVEN THOUGH THE PROBLEM IS WITH THE BRAKES. THEY REFUSED ME A LETTER OR EMAIL ON THIS ISSUE AND I ONLY TALK TO SOMEONE WITH A FIRST NAME. I HAVE HEARD THIS SAME NOISE SINCE 5/12/2012 BUT NOW IT IS GETTING LOUDER.