There is a switch above the clutch pedal and a switch behind the brake pedal that tell cruise control to switch off if either pedal is depressed. One or both may need adjustment or cleaning if an adjustment doesn't work. You can take them apart to clean them or just replace them.
__________________
2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |