What was found
DURING THE TAKEOFF ROLL, THE AIRCRAFT BEGAN TO DRIFT LEFT OF THE RUNWAY CENTERLINE, THE CREW ATTEMPTED TO CORRECT THE DRIFTING WITH THE APPLICATION OF RIGHT RUDDER BUT WERE UNSUCCESSFUL AND ABORTED THE TAKE OFF BETWEEN 70 AND 80 KNOTS. AFTER AN UNEVENTFUL RETURN TO THE GATE, MAINTENANCE FOUND FAULTS ON THE RUDDER RATIO AND ONE OF THE RUDDER PCAS BOTH FAULTS CLEARED FURTHER INSPECTION FOUND THE NR 5 BRAKE ASSEMBLY BINDING. THE BRAKE ASSEMBLY WAS REPLACED AND THE AIRCRAFT PERFORMED A SUCCESSFUL TEST FLIGHT AND ALL SYSTEMS OPERATED NORMALLY AND THE AIRCRAFT WAS RETURNED TO SERVICE.