As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT CREW REPORTED WHEEL BRAKE VIBRATION ON LANDING ROLLOUT STARTING APPROXIMATELY 60 KNOTS TO 30 KNOTS. MAINTENANCE FOUND THE RIGHT HAND BRAKE MASTER CYLINDER LEAKING AND REPLACED IT PER AMM 32-43-12. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.