I had this happen when I tracked my car for the first time. It was equivalent to brakes feeling mushy because of boiling fluid. It came back after it cooled and with slow, easy clutch engagement. I replaced the fluid with Motul RFB 600 and haven't had a problem since. I recommend a power bleeder if you replace the fluid yourself (
http://www.amazon.com/Motive-Product.../dp/B00KY56NCU).
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