there is a brake switch as well...application of the brake pedal will break lock on the cruise control. I'd bet the control for this is embedded in the smart junction box in the passenger kick panel but, I don't know for sure. It's going to have to talk to the FBW throttle control, which is in the main ECM underhood.
2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto N/A tune. 100 shot nitrous on BBR tune. Best e/t 11.38 at 120.85
2012 Premium GT, Candy Red, Brembo package, 3.73, MT82, Comfort, Tech, et al. Procal tune, Roush UCA, UMI poly LCA, GT500s, Steeda red bracket, Hoosier 28x10x16 bias drags. Best e/t 11.91 at 115.23 RIP