As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT MLG BRAKE: HYDRAULIC LEAK LEFT MAIN BRAKE. IN FLIGHT ON APPROACH TO CLT , AFTER GEAR WAS SELECTED DOWN, HYD VOLUME LOW CAS APPEARED. FOLLOWED THE CHECKLIST, RETURNED TO LAND. ON LANDING USED THE EMER BRAKE. THE FBO TOWED US TO PARKING. /// CORRECTIVE ACTION /// REPLACED LH INBOARD BRAKE WITH AN OVERHAULED BRAKE ASSEMBLY. WORK PERFORMED IAW 680A MM 32-42-05. BLED BRACKES AND VERIFIED LEAK CHECK IS GOOD.