Roadmaster 751507 Towed Vehicle Brake Monitor Light Switch Kit

Why do you need a brake light switch? Brake light switches are necessary only if you’re installing a supplemental braking system monitor, and the vehicle’s OEM brake light switch doesn’t work when 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.