Originally Posted by roverx
You could have a bad master or slave cylinder. Easy to check. Clamp the rubber flex line between the slave cylinder and the hard point on the bulkhead. Then push down on the clutch pedal. If you have play it's most likely a bad master cylinder. If it's rock hard it's probably a bad slave cylinder. Both easy to replace.
Also have found best results to change them in pairs.
Usually find when you install a new cylinder, the other one soon fails due to the extra performance and or requirements of the new cylinder. Happens more often when you change out the master and not the slave, but it also happens the other way around.
So again, for best results renew both cylinders together and installing a new hose won't hurt any, that's for sure.