WHILE DRIVING HER VEHICLE TODAY MY WIFE DEPRESSED HER BRAKE TO STOP AND SHE SAID THE BRAKE FELT LIKE PUSHING ON A RUBBER TIRE. THE CAR WOULD NOT STOP CAUSING HER TO RUN A STOP SIGN AND HIT ANOTHER VEHICLE. WE HAD THE SAME PROBLEM LAST MONTH AND THE VEHICLE WAS TAKEN TO THE CHEVROLET DEALERSHIP AND "REPAIRED" ACCORDING TO THE CURRENT SAFETY BULLETIN ISSUED BY CHEVROLET. THIS COLLISION CAUSED THE OTHER PERSON TO GO TO THE HOSPITAL VIA EMS AND MY WIFE WAS TAKEN BY POV TO ER FOR EVALUATION. OBVIOUSLY WHATEVER "FIX" WAS DONE BY THE DEALERSHIP WAS NOT THE CAUSE OF THE PROBLEM. I WAS TOLD THE VACUUM ASSIST PUMP AND HOSES WERE REPLACED, BUT THE VEHICLE STILL HAD THE SAME ISSUE.