Max fill for an A319.
Green 14.5L, Yellow 12.5L & Blue 6.5L.
It only reflects the amount in the resevoir, the system contains alot more.
The A320 series (318-319-320-321) hydraulic systems hold 235 Liters (62 Gallons) of fluid:
100 liters (26 gallons) in the Green system.
75 liters (20 gallons) in the Yellow system.
60 liters (16 gallons) in the Blue system.