As can be seen, there isn’t room for the stock Mazda slave cylinder on the 4/4 as the box is slightly further back and the slave would foul on the chassis.
So, what we have on the 4/4 is a coaxial slave cylinder mounted inside the bellhousing. This is good and bad I guess. Good is that it directly acts on the thrust bearing without linkages. Bad in that it cannot easily, if at all, have the fluid flushed out at the same time as the brakes. Also, if it fails, it is an engine out job!
Having once owned a MX5 I know that the standard external slave had poor reliability but was cheap, readily available, and easy to change.
Back to the coaxial item … I have spotted a bleed nipple on my car in-line on the clutch hose so that could be used for bleed and a partial fluid change. I do note that it is difficult to access though!
