I had same issue with my 2013 Nismo. I'm tracking mine maybe 7-8 times a year. First stuck clutch pedal happend fortunately on a cool down lap at MSR Houston. The track shop flushed my system with Motul 600. Everything worked done for rest of track events, but pedal stuck at home about a week later in city traffic. Fortunately. I have a great dealership. They know I am tracking the car. When they checked it out, the CSC had failed (it has plastic parts near high heat sources). Transmission also had metal shavings in it. They replaced my transmission under warranty, and at no charge, put on my aftermarket Z1 performance CSC, South Bend Stage 2 clutch and lightweight fly wheel. Have had two track events (COTA and TWS) with no issues. They even do my pre-race tech inspections at no charge as well. But too bad Nissan doesn't redesign the CSC to a more robust one.
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