What was found
ALL BRAKE ACTION WAS LOST AT APPROXIMATELY 20 KIAS DURING ROLLOUT. FLIGHT CREW SELECTED ANTI-SKID OFF TO PREVENT AIRCRAFT FROM GOING INTO OVERRUN AREA. REPLACED ANTI-SKID CONTROL BOX IAW DC8 MM AND OPS CHECK WAS GOOD. FURTHER INVESTIGATION REVEALED BROKEN WIRES ON THE NR 2, NR 4, NR 6 AND NR 7 ANTI-SKID TRANSDUCERS. WIRING WAS REPAIRED IAW DC8 WDM AND OPS CHECK OF ANTI-SKID SYSTEM WAS GOOD.