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these devices are nothing mysterious, they are just hydrolic controlled pistons w/ rubber seal and dust boot.. big stink. if you buy cheap shit or use used parts, the seals are obviously old and will have problems.
When I had to buy my new clutch MC I spent about 100 wholesale or so. I compared the diff between the cheapie 50-60 dollar version with the one I bought, and it was SO obvious when you tinkered with them. The cheapie used REALLY shit quality dust boot and seals, you felt how UNSMOOTH the piston travel was.. it was crap. If you pop open the resevoir you could see the rough casting. For those of you wondering, rough casting is NOT good for bushings.. it eventually will eat away at the bushing and cause failure. The better quality one was polished.
I ended up having to fully take apart my clutch MC because I (haha) used the JDM one (i converted from auto to manual and in the process used parts off of a clip).. the size of the MC's are similar but the JDM vs USDM was a bit different, so I just swapped internals. The seal is the only part thats important.
Same goes for the slave cylinder. Although, the NISMO one has minor differences which give the pedal an easier feel (from what i've read) .. so.. while the design may vary the concepts are all the same.
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