The brake lights functionality has absolutely nothing to do with CC operation cos the brake switch has 2 contacts within, the lights are on the N/O contact and the CC/EMS relies on the N/C contact which doesnt affect the lights at all. You can see the inputs with nanocom or similar but you can try to adjust the switch by fully depressing the pedal and pull the plunger with fingers as much as you can maybe you restore the N/C contact... to 100% rule out the switch remove it and check continuity on it between pins 1 -2 (where the green/orange and orange/green wires are going).
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