..after a long cross country drive, running about 12 hours, stopping only for gas. I went to downshift and the pedal went to to floor with no resistance. After running through the gears at a standstill, it seemed to be working fine. Is this a indication of a problem, or was everything just too warm?

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1999 Z-28 M6: Gran.MAF, LS1 MoSports intake, K+N filter,Corsa exhaust, PowerSlot rotors, Hoch. strut tower bar, still working