What was found
CREW REPORTED INCONSISTENT BRAKING ACTION UPON LANDING AT VNY, EXPERIENCING PULSATING BRAKE PRESSURE AND APPROXIMATELY 30% BRAKING EFFECTIVENESS, NEARLY USING THE ENTIRE RUNWAY TO STOP. A SIMILAR ISSUE OCCURRED EARLIER IN THE DAY AT KMSP, CAUSING A MISSED TURN-OFF. CREW SUSPECTED A BCU MALFUNCTION. MAINTENANCE INSPECTED MAIN BRAKE SYSTEM WITH NO DEFECTS NOTED. NO FAULTS OR FAILURES DETECTED. PERFORMED TAXI CHECKS AND HIGH-SPEED TAXI TEST WITH NO DEFECTS NOTED. WORK PERFORMED IAW EMB 505 AMM 32-41-00.