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When you’re flat towing, you want to be sure your towed vehicle’s brakes are actually being pressed—not just that the braking system *thinks* they are. The Roadmaster Stop Light Switch Kit wires directly into the car’s fuse box to provide a constant 12-volt signal to your RV’s monitoring system. It activates the alert only when your car’s brake pedal is physically applied. That means you’ll always know your supplemental braking system is working correctly and won’t risk it staying partially engaged.
If a braking system is installed wrong, it can keep pressing on the pedal even after you stop. That can cause serious wear on tires and brakes. This kit gives you real feedback from the pedal itself so you can catch problems right away. It’s a simple safeguard that helps prevent costly damage and keeps your setup safe and predictable on the road.
The Stop Light Switch Kit is built for a custom fit and includes the bracket designed for your vehicle. Reviewers like that the installation follows the instructions step by step and fits cleanly once in place. Everything wires neatly under the dash, with steady current from the fuse box so the system is reliable every trip. Tight spaces can make it a bit of a squeeze, but once mounted, it’s solid and stays put.
Built to run on 12 volts, the Roadmaster kit ties into your electrical system for dependable function every time you tow. Once installed, it works quietly in the background—no switches to flip or sensors to adjust. You just get a steady signal from your towed car’s brake pedal to your motorhome’s monitor, so you can focus on driving and trust that everything is working exactly as it should.
Flat towing can be a much more convenient way to take your car RVing with you than using a trailer or a tow dolly. It'll save you storage space both at home and at the campsite, and it takes less time and hassle to hook up.
To flat tow your vehicle, there are 5 basic components you're going to need: a tow bar, a base plate kit, a safety cable set, tow bar wiring, and a flat tow braking system.
| For the RV | Between the RV and Towed Car | For the Towed Car |
|---|---|---|
| Hitch | Tow bar | Base plate |
| Wiring plug | Safety cables | Braking system |
| Wiring adapter cord | Wiring kit/diodes |
The custom-fit base plate installs on the frame of your toad so you can connect the car to your RV with a tow bar. Hook up safety cables between the vehicles to ensure that the toad does not separate from the motorhome if the tow bar becomes detached. Tow bar wiring syncs your vehicle's signal lights with your motorhome's tail lights, as required by law in most states. Finally, the flat tow braking system - also required in most states - activates the brakes in the toad when you hit the brakes in the RV, making for smoother, safer braking, and preventing wear on your motorhome.
Customer Satisfaction Score:
89% were satisfied with this product
11% of customers were not satisfied
Ratings & Reviews
difficult to install
Have to install and let you know
Thank you
Easy to install, works great.
Everything wet well with this product. Seems like it should be offered when your ordering the tow kit itself. Had to order after the fact.
Yes I got my product in a timely manner, and it is what I ordered thank you .
Complete kit. Relatively easy to install but like most newer vehicles, room to work under the dash is tight.
Henchman
1/30/2022
Works GREAT!!!
Excellent product. Installed just like the instructions said it would.
Installation was straight forward and support available if required.
Did the job it was supposed to. Instructions were easy to follow.
Instructions were great. Everything was exactly per the instructions. Bracket was perfect for my car. Would be 5 stars, but the fuse tap was wrong size. It came with a mini, but I needed a micro2. Had to order one at local auto store. Will get it Tuesday. You should have kits with different size fuse taps or include multiple sizes in common kit.
Works great! Lets me know my brakes are applied on the road!
As before, excellent product. Absolutely love eTrailer and all their knowledgeable staff. Can't recommend them enough!!!
Great product, excellent retail experience and prompt shipping. What’s not to like?!
Installation was a breeze and the product has worked flawlessly for a year. Excellent experience!
Worked well for my Demco Stay-in-play brake system. Video was very helpful.
I was disappointed to find out that I needed this kit instead of being able to tap into the cold side of my car's brake switch as I had done before. The kit was initially puzzling to get the parts oriented correctly in my car but when I did, it was easy to install and had worked fine. I had to put an air adjuster on my Brakemaster and had to balance the tuning on with the tuning on this switch. But it worked out and has given me no problems.
Stoplight switch kit was easy to install. All contents needed was supplied.
I purchased this as part of a package which included; Hitch and wiring for my 2022 Equinox, Base plate, Tow Bar, brake System and connecting air hose, break away cables, LED tow lights with wiring harness, and a trickle charger to keep the Equinox battery from going dead while I was towing it behind my class A RV.
I had etrailer do the install of all the components on my car and RV. All the workmanship was excellent and done in the amount of time they said it would take. Also because they did not have a video of this equipment being put on this year and model vehicle, I gave them permission to make a video(which added a extra day and a half to the install)and the installation was free. Everything has worked perfectly and I couldn't be happier. Etrailer is my go to for anything towing and also RV parts.
Jay
1/7/2025
it is nice to look in the rear view camera and see that the breaks are working on the car
Installed on a 2023 Equinox LT (AWD). I believe there may have been a change to the Equinox brake pedal assembly from prior years. Because of this, I was not able to get the switch located properly with the bracket that is included in the kit. I fashioned my own mounting plate from a piece of diamondplate which I bolted to the brake lever bracketry. This works great and is rock solid.
Do you have a question about this Flat Tow Brake System?
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Ronald
6/18/2023
Great