What was found
MAIN BRAKE SYS FAILED WITH LOW BRAKE PRESSURE & ANTI-SKID INOPERATIVE LIGHTS ON LANDING. POWERED ACFT UP, AND RAN THE BRAKE SYSTEM SEVERAL TIMES AND COULD NOT FIND ANY DISCREPANCIES. INSPECTED THE WIRING FROM THE MOTOR, PRESSURE SWITCHES, AND THE RELAY COULD NOT FIND ANY DISCREPANCIES. THERE WERE NO BRAKE FAULTS ON THE SKID CONTROL FAULT DISPLAY UNIT. TWICE WHEN THE PUMP WAS RUNNING IT LAGGED DURING THE START UP PHASE BUT RAN FINE. SUSPECT POSSIBLE RELAY. REMOVED AND REPLACED THE BRAKE MOTOR. REMOVED AND REPLACED THE BRAKE RELAY. FUNCTIONAL CHECK OKAY, BRAKE BLEEDS OKAY.