PCV valve or Brake Booster line for Sea Foam?

If you do not know what you are doing - DO NOT add to your BRAKEs you can mess up your entire brake system and mess up all of your seals in the system and have to replace the cars entire braking system! VERY EXPENSIVE! Sea foam is good stuff if used properly, but in the wrong hands can be a BIG mistake! add the sea foam to the gas tank