one way valve?

[Adey aka Ewok]

should i be running one in the pipe that goes to the brake servo?

[TNT ANDY]

should i be running one in the pipe that goes to the brake servo?

Yes otherwise, when on boost, it will push on the servo diaphram rather than pull. I don't know if it would damage it, but I suspect it would.

[SP33DY]

I've never fitted one to mine and have ran upto 24psi without issue. So unless your going beyond that I wouldnt worry :)

[Adey aka Ewok]

Well it isn't broke so I'll leave it as is, cheers

[5teve L]

They are pennies to buy, I just bought one off the bay for £5 ;)

[THE MASTER]

should i be running one in the pipe that goes to the brake servo?

you should have two fitted .. one in the servo to hold any vacum and one in the manifold to stop any boost going back to the servo