What was found
RIGHT MLG BRAKE: WHEN TAXIING THE ACFT AND EITHER PILOT APPLIES RIGHT BRAKE, THERE IS A NOTICEABLE GROWLING SOUND. ALSO, WHEN APPLYING THE BRAKES WHEN COMING TO A FULL STOP, THERE IS A PRONOUNCED SHUDDERING OF THE ACFT. JACKED AIRCRAFT AND REMOVED #3 & #4 TIRES. CLEANED AND INSPECTED BOTH BRAKES LOOKING FOR FOD AND GENERAL CONDITION. REINSTALLED #3 & #4 TIRES. REF C680A AMM 32-40-05. BLED #3 & #4 BRAKES, SMALL AMOUNT OF AIR WAS SEEN LEAVING #3 BRAKE. REF C680A AMM 32-40-00. NO DEFECT NOTED. PERFORMED OP CHECK BY TAXIING WITHIN THE CONFINES OF NETJETS PBI RAMP. NO BRAKE ISSUES WERE FOUND, NO CHATTERING OR GRINDING HEARD.