2008 Yamaha Raptor 250SE / 250SE2 Factory Service Manual, Page 91Get this manual
ADJUSTING THE REAR BRAKE LIGHT SWITCH CHECKING THE BRAKE HOSES
ADJUSTING THE REAR BRAKE LIGHT SWITCH NOTE: The rear brake light switch is operated by movement of the brake pedal The rear brake light switch is properly adjusted when the brake light comes on just before the braking effect starts1Check: rear brake light operation timing IncorrectAdjust