What was found
DURING TAH, PRIOR TO TAKEOFF, FOOT BRAKES APPLIED, NO BRAKING ACTION TOOK PLACE. BRAKE SYS PRE-SELECTED TO THE ATTACHED MODE. INVEST REVEALED WITH ANTI-SKID SELECTED THE FAULT LIGHT WAS OUT WITH BRAKES APPLIED. INITIALLY, BRAKES WENT ON, BUT RELEASED AND STAYED RELEASED. APPEARS ANTI-SKID CONTROL BOX FAILED WITH BRAKE VALVES IN OPEN POSITION. BRAKE ANTI-SKID CONTROL BOX, PN 9912305-6, SN 847, WAS REMOVED. RECORDS SHOWS ORIG INSTALL 12-93, ACFT BUILD DATE. A TEST OF INDICATION SYS FOR ANTI-SKID SHOWED SWITCH ON-LIGHT OUT, BUT ON REPLACEMENT PART, SWITCH ON-LIGHT OUT-LIGHT ON-LIGHT OUT. (X)