Seems to go from the intake after filter, to engine, to some other place and the long way to a big drum behind steering wheel.

 

Car seems to lack power for a moment if i slow down to 5mph and then accelerate slowly (basically, in traffic) before it suddenly gains power a second too late. Goes fine if i floor it. Just had some free time and finally traced a slight hissing sound to that hose to discover it's cracked behind. I have no idea what to even ask for at a garage

 

1.2tsi, 7 speed dsg, 2013

Look along the hard plastic sections and you'll probably find its part number, you can see the part number of the one that crosses it "03F 133 366 C"  look for something in that same format on the one that's got the leak but starting 6R rather than 03.  Hope to find a part number that matches one of the ones on here: vacuum hoses for brake servo - Fabia(FAB) [EUROPA 2013 year] (7zap.com)

 

13 minutes ago, Athrx said:

a big drum behind steering wheel

 More commonly known as the brake servo.  Your leaky hose is important for its correct function.

 

Found the serial number, ebay sends me to throttle body components..

 

I just popped in to halfrauds and asked them about their hoses. Ended up with a fuel line?

 

It fits, although it's a bit tight to push it all the way on either side, so i assume it's tight enough.

 

Now on to the 2h+ traffic towards home to test drive

 

Fair enough, easier and cheaper than I had expected.