Like the others have said, first step would be to bleed the clutch system, and re-fill the reservoir to the max line with a high quality DOT 4 brake fluid with a high boiling point such as Motul RBF 600 ... then regularly check the fluid level in the reservoir. If you notice a loss of fluid, you would then be looking at replacing the CMC and/or CSC. Judging from your symptoms (i.e., soft pedal feel, without the pedal going to the floor), I suspect your CMC may be the issue. If the CSC fails, it's usually catastrophic (i.e., complete loss of pedal pressure). If you do need to replace the CMC and/or CSC, look for after-market solutions. As Chuck says, do not simply install another OEM CSC. Check with Joe at Z Speed Performance. He carries a heavy-duty CSC as well as a clutch movement alteration kit (CMAK) that re-locates the slave cylinder outside the transmission bell housing. Both are high quality parts. In terms of a replacement CMC, you may want to check with Ryan at RJM Performance. He carries a Gen 2 HD CMC. That said, changing out the clutch fluid may solve your problem ... at least in the short term. Recognize that failure of the stock CMC and/or CSC is not uncommon ... some view them as ticking time bombs. Also, in terms of your steering lock failure, what model year is your Z? IIRC there was a recall issued by Nissan covering the cost of replacing the unit for certain model years ... however, I'm not sure of the details. Someone else can likely fill in the details for you. Trust this helps!
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