I know that the brakes are supposed to be difficult to press down with the engine off - I was just giving that as an example of what my brake feels like when I stomp on it - as for the tee-piece, it is currently blocked off and goes nowhere. I have also tried removing the tee-piece and running it direct to the booster - still no luck.
And that IS the booster than it runs off to - that little vacuum line running along the back of the firewall goes from the brake manifold to the booster?
And something about a one-way valve? Does anyone have a pik of it? Or even a dodgy mspaint sketch will do!