I mean the light sensor haha, and I never use the rear brake anyways, I removed it, no issues. Thanks for the reply man!Brake sensor? What brake sensor? You mean the brake light switch on the pedal, or do you mean the wheel speed sensor on the rear wheel?
If you mean the wheel speed sensor, it will throw codes and disable ABS on rear as well as likely affect traction control etc.
If you mean the brake light switch, no issue likely. other than cars driving into you when you brake and they don’t know. :-/