What was found
WHILE USING BRAKES AT ANY TIME, BRAKES THUMP & MOMENTARILY LOCK UP. PIN LENGTH IS GOOD & NO ANNUNCIATION WAS NOTICED. REMOVED LT & RT WHEEL ASSEMBLIES, INSPECTED RT BRAKES WITH NO DEFECTS NOTED. INSPECTED LT BRAKES WITH NO DEFECTS NOTED. CLEANED LT & RT BRAKE ASSEMBLIES. REINSTALLED WHEEL ASSEMBLIES. TAXIED ACFT & PERFORMED OPS CHECK OF BRAKES WITH NO DEFECTS NOTED. ALL WORK PERFORMED IAW AMM 32-40-00. NO FURTHER ACTION REQUIRED.