What was found
RTO - AIRCRAFT WEIGHT 143.1, AIRSPEED 5 KTS, OAT 01C, PRESSURE ALTITUDE 900 FT, BRAKE ENERGY CHART - NORMAL. BRAKES WOULD NOT RELEASE WITH 85 PERCENT N1 ON ALL 3 ENGINES FOR APPROX 6 SEC. AFTER REPLACING AUTO BRAKING CONTROL VALVE BRAKING OPS CHECKED GOOD. REMOVED AND REPLACED NR 3 BRAKE DE-BOOST VALVE, OPS AND LEAK CHECKED GOOD. REMOVED AND REPLACED MAIN GEAR BRAKE METERING VALVE. PERFORMED OPS CHECK, VALVE WAS NO HELP. REMOVED AND REPLACED AUTO BRAKE CONTROL MODULE IAW B-727 M/M 32-46-21. OPS AND LEAK CHECKED GOOD. REMOVED AND REPLACED RT BRAKE SHUTTLE VALVE IAW B-727 M/M 32-41-51. OPS AND LEAK CHECKED GOOD.