Looks like I've got a leaking union on the PAS hose where it goes into the rack on a Focus diesel. Should just be a new gasket but obviously I'll be losing most of the fluid from the rack and reservior putting the new one on. Could anyone make a guess how much I'll need to fill it back up again? I cannot find any data and the dealr just fills it from his big 50 gallon drum of dextron whever he services one so he's no wiser either.
TIA