Why do you need a brake light switch? Brake light switches are necessary if you're installing a supplemental braking system monitor, and the vehicle's OEM brake light switch doesn't function while the vehicle is in 'tow' mode. When installing a supplemental braking system, the RV driver should be able to monitor the braking activity of the dinghy. Roadmaster accomplishes this by monitoring the towed car's brake light switch. But in some vehicles, the brake light switch only functions while the car is running. The Universal Brake Light switch solves this problem by adding a brake light switch that functions while towing. The brake light switch is only activated when the brake pedal is depressed. No other manufacturer provides brake light switches with this level of specificity. If you know when the towed vehicle's brake pedal is depressed and released, then you know if the supplemental braking system is positioned properly and working as it should. The Universal Brake Light Switch connects InvisiBrake, BrakeMaster, Even Brake and 9700 motorhome monitors directly to the towed vehicle's brake light, so you always know when the brake pedal is depressed and released. It's simple - brake light on: monitor on; brake light off: monitor off. And although it was designed for Roadmaster systems, this system will work with any supplemental braking system that moves the brake pedal of the towed vehicle.

 PROP 65 WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For more information, visit www.P65Warnings.ca.gov