What was found
RIGHT MLG BRAKE: AFTER LANDING DURING NORMAL BRAKE APPLICATION, AIRCRAFT AGGRESSIVELY AND VIOLENTLY BRAKED FORWARD RESULTING IN VIOLENT NOSE DOWN AND UP MOVEMENT. MOVEMENT WENT AWAY AFTER BRAKE RELEASE AND RETURNED UPON RE-APPLICATION ON RUNWAY. COULD NOT DUPLICATE DURING TAXI SPEEDS. BRAKING WAS NORMAL DURING TAXI AND PARKING. AFTER SHUTDOWN. RIGHT MAIN BRAKE ASSEMBLY WAS SMOKING AND HAD FLUID SPRAY PATTERN ON INBOARD NO.4 TIRE. SEE PHOTO. // SIGNOFF// REPLACED THE NO.4 MLG BRAKE WITH A REPAIRED UNIT IAW GLOBAL 5000 AMM TASKS 32-43-13-000-801 AND 32-43-13-400-801. PERFORMED BLEEDINQ, LEAK CHECK, OPERATIONAL CHECK AND TAXI CHECK AND ALL OPERATION NORMAL AT THIS TIME. REPLACED THE NO.3 AND NO.4 MLG WHEELRRIRE ASSEMBLIES WITH A REPAIRED (NO.3) AND A MODIFIED NO.4) UNIT IAW GLOBAL 5000 AMM TASKS 32-41-01-000-801 AND 32-41-01-400-801. NO FURTHER ACTION REAUIRED.