What was found
AFTER LOWERING GEAR, HYDRAULIC VOLUME LOW CAS MESSAGE APPEARED, FOLLOWED BY THE HYDRAULIC PRESSURE LOW LT & RT CAS MESSAGE. COMPLETED THE HYDRAULIC VOLUME LOW EMERGENCY CHECKLIST. EMERGENCY BRAKING WORKED AS EXPECTED. INSPECTION REVEALED PRESSURE PART ON NOSE STEERING UNIT CAME LOOSE. REPLACED SWIVEL AND HOSE IAW MM 32-50-00. ACCOMPLISHED HYDRAULIC SYSTEM BLEED IAW MM 12-12-02, LEAK CHECK, CLEARANCE CHECK, AND OPS CHECKS GOOD. SERVICED BRAKE BOTTLE IAW MM 12-13-01. ACCOMPLISHED BRAKE BLEED PROCEDURE IAW MM 32-42-10.