I don't but I spoke to a mate who explained what the vacuum hose does etc. I have now taken two hoses out, both of which had splits. The car often sounds like a jet fighter with a real whinewhich I had assumed was the fuel pump but now I am thinking it may have been one of these splits.
Just need to know which way to install the one way valve when I put the new pipes in. Does air flow from or to the master cylinder?