What was found
WHILE TOUCHING DOWN AT LANDING, PWR BRKS CB TRIPPED. LOW BRK PRESS & ANTISKID INOP MESSAGES ILLUMINATED. BRAKE PRESSURE COMPLETELY FAILED & ACFT HAD TO BE STOPPED ON TAXIWAY WITH THE EMER BRAKE HANDLE. CB WAS RESET IAW QRH & 2 MESSAGES EXTINGUISHED. ACFT TOWED TO HANGAR & BRAKES WERE NOT TESTED. REMOVED BRAKE MOTOR P/N MP50B-1 S/N 3375 DUE TO CIRCUIT BREAKER POPPING AND INSTALLED OVERHAULED UNIT AS DESCRIBED ABOVE IAW CE560XL MM CH 32-44-20. BLED BRAKE SYSTEM, OPS AND LEAK CHECKED GOOD.