THE EMPLOYEE STATES THAT WHILE TRAVELING DOWN A BENCH, THE BRAKES IN HIS LUBE TRUCK WENT OUT. THE VEHICLE WAS TRAVELING TOO FAST TO MAKE A TURN AND ROLLED. THE EMPLOYEE WAS TREATED FOR INJUR IES TO HIS FACE AND PLACED ON LIGHT DUTY. A PRE-OP WAS COMPLETED PRIOR TO THE EMPLOYEE OPERATING THE TRUCK STATING NO BRAKE PROBLEMS.