Originally Posted by daemdaem
BTW, I am concerned. Leaking water? I hope not brake fluid...
Probably Amaezing meant to say it's leaking air. Vacuum to be more precise.
It's a very common issue. This seal rips and desintegrates over time and it's almost impossible to buy it separately.
But you can adapt a 40mm axis seal, if you have some of Macgyver's DNA.
You don't need to remove the booster, but it will require a lot of contortionism under the dash.
I did it on mine a couple of years ago and it still holding quite well.