What was found
ON TAXI OUT WITH ANTI-SKID ON, NO BRAKING WAS AVAILABLE FROM EITHER SIDE BRAKE PEDALS. EMERGENCY PARK BRAKE FUNCTIONED NORMALLY. FLT 5426 REPLACED ANTI-SKID CONTROLLER UNIT IAW AMM. OPERATIONS CHECKED GOOD ALL BRAKES WORK NORMALLY ON STATIC CHECK, PN 42-687 1, SN ON 480 & SN OFF 433.