Master cyl.problem

[WD Steeves]

My master cyl. (power brakes) seems to forcing fluid out between the gasket and body.The resevoir isn't overfull,the bales are tough to get on the lid,yet when I shut off the engine I hear what seems to be a hissing sound.The cyl.body is soaked with fluid.Is it possible for air to be building up in the system and forcing the fluid out?My power booster vacuum line goes into the manifold behind carb.Do I have it in the wrong spot?Has anyone ever come across this problem before?Any input greatly appreciated.Thanks