WEAVER99

I had just purchased a 99 GS300, and was wanting to use seafoam to clean the carbon out. I've read alot of guys that have done this and it works good. My question is, it says to run it through your brake booster line, for you that have done this on your GS, where exactly was the line located at that I need to use? Or is there a better way to do it? I appreciate the replies, and so far really enjoy the GS.