As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSTALLATION, ROTOR BRAKE CONTROL VALVE ASSY WEAK. ROTOR SYSTEM WILL NOT STOP WITHIN 1 MINUTE WHILE BRAKE IS APPLIED AT 3350 PSI PEAK. IN LOCKED POSITION THE PSI WILL DROP TO 180 AND WILL NOT FIRMLY LOCK HEAD (CAN MANUALLY PUSH HEAD THROUGH WITH LITTLE RESISTANCE). REPLACED WITH NEW UNIT, CORRECTED PROBLEM.