Bft: This is the only pic I can find right now and yes it's a reservoir system just like the Brake booster just remote mounted/actuated as I said simple to plumb unlike the genuine Toyota Clutch booster that's inline the same as the stock brake booster..
Turbo's use a few different types of seals one of them being a simple labyrinth seal (think maze for Oil) They don't actually "seal" anything and rely on gravity to work.
Never had a problem getting bulk boost with my AVCR a few times while testing it went to 32psi.
Might be something either in the settings or in your mechanical combination causing it.
VH44 IS a remote booster you just plumb it in the line between the Master and Slave and a line to vaccum and you're good to go.
The 44 from memory is the smaller capacity and the 40 the larger.
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