Time for seafoam..Brake Booster Line????

I am doing seafoam tommorrow and I hear we use the brake booster vac line. But I am not sure exactly what line it is. Is this the right one??
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The directions on the can say suck up the liquid SLOWLY. I didnt read them until after i let the brake line suck it up. :bang: . I sucked up over half a can in less than 2 seconds. :lol: . I looked around on stangnet and u gotta be carefull not to hydrolock your engine if u do this. My car is fine by the way....THrow some in the gas tank too man. Clean out that fuel system