TL*THE CONTACT OWNS A 2001 MERCURY GRAND MARQUIS. WHILE DRIVING 30 MPH, THE BRAKES MADE A SQUEALING SOUND AND LOCKED WHEN THE PEDAL WAS DEPRESSED. THE FAILURE CAUSED THE CONTACT TO REAR END THE PRECEDING VEHICLE. THE AIR BAGS FAILED TO DEPLOY. THERE WERE NO INJURIES. A POLICE REPORT WAS FILED. THE VEHICLE HAS NOT BEEN DIAGNOSED BY THE DEALER. THE CURRENT AND FAILURE MILEAGES WERE 50,000.