As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON LANDING ROLLOUT, PILOT HAD NO LT BRAKE. MX REMOVED LT MASTER CYLINDER AND DISCOVERED MASTER CYLINDER END GLAND HAD UNSCREWED ALL BUT 2 THREADS CAUSING FLUID AND PRESSURE LOSS FROM MASTER CYLINDER. REPLACED INTERNAL SEALS AND REASSEMBLED. REINSTALLED AND OPS CHECKED OK.