What was found
BRAKES APPEAR TO LEAK FLUID. RES FULL AT UPPER SIGHT GAUGE. NO AIR BUBBLE VISIBLE. 15 MINS AFTER DEPLANING UPPER SIGHT GAUGE ONLY 1/3 FULL. BRAKE PUMP CYCLES EVERY 26 SECS. BRAKE PRESS GOES TO 1400 PSI & BLED DOWN TO 1200 PSI IN 26 SECONDS, PUMP ACTIVATES. BRAKES OPS NORMAL. 1ST TIME SETTING PARK BRAKE WITH 3 PUSHES ON PEDALS PRIOR TO PULLING PARK BRAKE HANDLE, BRAKE LOW PRESS LIGHT ILLUMINATED FOR 6 SECS & PUMP ACTUATED UNTIL LIGHT WENT OUT. INSPECTED BRAKES, NO LEAKS FOUND. FOUND ANTI-SKID VALVE LEAKING INTERNALLY, REPLACED VALVE WITH O/H UNIT. BLED BRAKE SYS & TAXI CHECKED GOOD. ALL OPS & LEAK CHECKED GOOD. VERIFIED PUMP CYCLES WITHIN LIMITS 10.5-20 SEC OFF IAW CES-FT-ZL-0012 IAW MM 32-42-05.