Quick Q: Common vac pipes to split?

[Y83OLK]

Hi,
Recently my 2001 S3 occasionally doesnt feel like its boosting properly... maybe 1 day a week?.
Aswell as occasionally the brakes not performing 100%

Which would say to my split vac pipe... Ive had a quick look and they all look sound.. Vagcom shows no codes.
But everytime i go to log boost (115) it performs ok.

Any common pipes i should have a closer look at?.

Regards
Callum

 

[Y83OLK]

bump

 

[1animal1]

if you look at the engine, theres a few pipes to the right of the washer filler bottle...these are prone to going (like many others) and have something to do with the brake system too.....go on the forge site as they have a couple of main pipes that tend to go.....any others you'll have to source from the dealers

if this isnt where it is, check above the engine, check below the inlet manifold....etc etc