Where is the brake booster located for my car?

i went in to get an oil change today and swapped to synthetic, but before I went i grabbed a bottle of seafoam cuz ive been hearing its a safe way to clean your injectors and fuel system.

Every video ive seen online has said to but 1/3 can into fuel tank, 1/3 into oil, and the remaning 1/3 into your brake booster vacuum line.

Now i did both steps for fuel tank and oil but when i got to the break booster line i had no clue where it was on my Mazda 3 2.3L.... SO i just dumped the rest into the fuel tank...

Can anyone tell me where the hose to put this stuff in is? i also heard you can use your pcv (or is it pvc?) hose to suck it up as well but i have no clue where that is either...

Sorry Im noob and would reallly appreciate some help.



BTW: next time i plan to clean my fuel system ill be using RedLine SI-1 instead of seafoam, does it work the same way as sea foam as far the 1/3, 1/3, 1/3 thing goes? (im at 40k miles now dont plan on doing this again until atleast 70k
 
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