What was found
ON THE TAXI OUT FOR DEPARTURE THE RIGHT SIDE BRAKE WAS PULSATING AND CHATTERING, SHAKING THE ENTIRE AIRFRAME. LINE SERVICE ALSO OBSERVED THE AIRFRAME SHAKING AS THE BRAKE WAS APPLIED. REMOVED RH BRAKE ASSY P/N: DAP00097-04, S/N: 5028YJ. AND INSTALLED BRAKE ASSY S/N: 5091QK BLED BRAKES. REFERENCE EMB 505E M.M. 29-10-00, 32-45-21, AND 32-40-00. REMOVED FAILED BCU PN DAP00100-10 SN 501870891 AND INSTALLED A MODIFIED CUSTOMER SUPPLIED UNIT PN DAP00100-10 SN 353010491. SECURED TWO CLAMPS. SECURED DRAIN LINE, OPS CHECK SATISFACTORY. ALL WORK IAW MM 32-41-01.