As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI IN, CREW FELT BRAKE LOCK UP. STOPPED AND CALLED FOR MAINTENANCE. UPON INSPECTION FOUND COUPLING ON NR 4 BRAKE DAMAGED. AIRCRAFT WAS TOWED TO BLAST FENCE AFTER THE BRAKE WAS BLEED. REPLACED COUPLING. OPERATED BRAKES, OPS CHKS NORMAL.