Originally Posted by JARblue

My CSCEK cylinder failed within a couple of weeks of install. Apparently it was an early version. When I notified them of the issue, they told me there was a newer version of the cylinder available. Then tried to charge me $59 for it plus shipping and wanted me to send my old failed one back first on my own dime

The cylinder failed on me two more times and every time they sent me a new one it was a different design. Kind of annoying that I replaced a working OEM CSC at 51K miles and then had the aftermarket slave cylinder fail on me 3 times in the next 30K miles. Not to mention some other parts on the kit that kept breaking that I either fixed with non-Z1 part or finally just stopped replacing. Z1 is basically dead to me.