There's a couple of reasons I'm looking into a hydraulic solution...
The intake setup I run causes the cable to rub on an edge that is slowly eating its way through the cable casing
My firewall adjuster is nearly impossible to get to (I run the MM cable and quadrant), to adjust
As the the clutch wears and I want to adjust the cable to allow the pressure plate more room to clamp down, I gotta cuss and nearly stand on my head to get it turn in a few threads. (it's not cable stretch because that would cause the opposite problem)
The torque I make down low is SCREAMING for a heavier pressure plate. I'm at the point now where if I'm cruising down the highway and stomp on it in 3rd or 4th, the clutch slips.
I don't need to feel each and every bump and scratch in the flywheel when I switch gears. What I need is for the clutch to ENGAGE when I release the clutch pedal and DISENGAGE when I push it down. I'd also like for it to self-adjust. Nothing under the car or hood to mess with. It just does what it does.
I'm also looking at replacing my Bassani 1 3/4 shorties with a set of longtubes at some point. Yeah... I know it can be done with a cable setup but it would be just that much easier to route a hyd line to the slave rather than pave a clear path for the cable.
Now, my next clutch will most likely be a Mcleod RST Twin. That kills the need for a crazy pressure plate. That still leaves me with adjustability, access to the FW adjuster, and potential headaches of routing around the longtubes along with the cable chafing problem that I'm currently having.
I'd like to find someone who's run this kind of setup. I've heard horror stories from users of other similar systems where the throw-out bearing/Hydraulic slave leaked and caused the whole assy to be pulled apart for the replacement of that one part. Ugh.
I like the looks of that system that 5L5 posted up. Keeping the clutch fork would kill worries about having to replace that other type if it leaked.