I hope it's just the need to bleed! Not sure how it works on a z31, but the basic procedure on other cars is just like that for brakes. We did it on a friends Civic Monday:
1) open mastercylinder
2) fully depress pedal
3) open bleed nipple (w/ a hose and bottle attached unless you want a mess)
4) let fluid come out
5) close bleed nipple
6) pull pedal off the floor
- repeat steps 2-6 until you have pretty fluid (don't forget to keep an eye on the resevoir as you go - it's not as big as the one for brakes.
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