A DC9-30; DURING A #3 TIRE AND WHEEL ASSEMBLY REPLACEMENT; BRAKE WAS CHKED AND FOUND UNABLE TO MOVE BRAKE ROTORS. WHEN ROTORS WERE FREED; BRAKE PAD CHUNKS BEGAN TO FALL OUT. NON ROUTINE CARD WAS WRITTEN UP TO REPLACE #3 BRAKE.

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ON THE EVE OF FRI/JUN/2005; MYSELF AND ANOTHER TECH WERE ASSIGNED ACFT X. DURING LINE CHK; I FOUND #3 TIRE WORN TO OVERNIGHT LIMITS. AFTER TIRE REMOVAL; I WAS CHKING THE BRAKE; AND I WAS UNABLE TO TURN THE DISCS BY HAND; AND I NOTICED BRAKE PAD CHUNKS. AT THE TIME WE HAD NO BRAKES IN ZZZ. I COPIED THE LOGBOOK; AND ON SUN/JUN/2005; I RETURNED TO WORK. MY CO-WORKER INFORMED ME OF A MANAGER; MR X; THAT SIGNED OFF THE BRAKE AS OK. NEEDLESS TO SAY; I WAS PRETTY UPSET. THIS 'NEW HIRE' MANAGER COMES IN HERE AND QUESTIONS MY TECHNICAL CAPABILITIES. I HOPE THIS ACFT HAS NO INCIDENTS. WE ALSO NEED SOME FAA OVERSIGHT OF THE MANUFACTURER AND THE PRODUCT OF BRAKES AND TIRES. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: AFTER REMOVING THE #3 TIRE AND WHEEL ASSEMBLY; THE BRAKE WAS INSPECTED AND WAS FOUND TO HAVE SEIZED ROTORS. THE ROTORS WERE FREED; AND UPON TURNING THE ROTORS; BRAKE CHUNKS FELL OUT. A NON-ROUTINE CARD WAS WRITTEN TO REPLACE THE BRAKE DUE TO WEAR AND BRAKE PAD FAILURE. A RECORDS CHK REVEALED THIS BRAKE HAD BEEN ON THE AIRPLANE 14 DAYS AND HAD BEEN OVERHAULED AND ASSEMBLED BY A CONTRACT MAINT FACILITY. THE RPTR STATED THE CONTRACT FACILITY; WHEN ASSEMBLING A NEW BRAKE; WILL INTERMIX STATOR BRAKE PAD DISCS SHOWING LIMITED WEAR WITH NEW STATOR PADS. THE NON ROUTINE CARD WAS SIGNED OFF BY A MANAGER WITH A STATEMENT; '#3 BRAKE FOUND OK FOR SERVICE.'