2003 Ford Mustang Question: Why is my brake sensor (Actuator?) is overheating and causing the wires to burn.

I had this problem a year ago and noticed that the wires, coming out of the sensor right next to the brake pedal, were burnt to a crisp. I replaced the wires and it worked fine for a year, I started having the problem again so i went to the same place and found that the wires were burned again. why are they overheating? the only thing that i have done to my car in relation to the brakes is putting in a sequential tail light conversion kit.