[DanEC]

Ok - I see what he meant now on the reservoir. If you lose a brake circuit - provided your clutch master and slave cylinders are not leaking - you should still have clutch action without problems. What fluid is pushed by the master to the slave when the clutch is disengaged, will return in equal volume to the master when it's engaged. Plus there will be a bit of brake fluid still up in the line from the reservoir running down to the master cylinder to cover minor fluctuations due to fluid temperature, etc. At least that's my story and I'm sticking to it.