When replacing all brake lights on 911's with cruise control, the cruise control may cease to function.
A resistor ballast must be added to satisfy the CC ECU.
This pigtail is added in the front trunk in series with the brake light wires going to the brake master cylinder.
No cutting/modifications necessary to the car's wiring.
Plug and play
911 Brake Light Resistor Ballast For Cruise Control Compatibility