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When you’re towing, you want to be sure your supplemental braking system is actually pressing the pedal—not just cycling an air cylinder. The Roadmaster Stop Light Switch Kit activates your RV’s brake-monitoring system whenever the brake pedal in your towed car is applied. Instead of guessing, you’ll get a true indication that the pedal itself is moving, so you’ll know the system is doing its job.
If a braking system stays partially engaged, it can wear out tires or even damage the vehicle’s brakes. This kit helps you avoid that by sending a reliable, constant-current signal straight from the towed car’s fuse box. You’ll know immediately if something isn’t right before it turns into expensive repairs.
Some vehicles don’t provide a brake signal when they’re in tow mode, which makes monitoring tricky. This 12-volt kit solves that by wiring directly to the car’s fuse box and creating its own dedicated signal. It’s an easy way to make sure your supplemental braking monitor still works even when the factory switch won’t.
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.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi, everyone. Steve here with etrailer.com. Today, we're looking at this Roadmaster Stoplight Switch Kit. Now folks, this is a custom fit application, so make sure you're double checking the fit guide here at etrailer.com, on our homepage, where it says your make and model, my vehicle information, any of those kind of questions and answers, make sure you're getting the right part for your specific setup. As you know, this will activate the motor home brake monitoring system whenever the brake pedal in the tow car is applied. This also ensures that the supplemental braking system is functioning properly.
As you can see, it comes with this custom bracket for the vehicle. It's been powder-coated to prevent corrosion and rust. You've got the stoplight switch here, couple pieces of wire, different colors and lengths. You got an inline fuse, you got a fuse tap here, and all the necessary connectors and fuses you might need. Now, this works great for an application that does not have a tow position in the ignition and also ensures that your supplemental braking system is functioning properly.
Now, this also wires directly into that car's fuse box or vehicle, whatever it is, for consistent current, and it runs on 12 volts of power. That's gonna wrap it up for our look together. I'm Steven. Thanks for watching.
Customer Satisfaction Score:
70% were satisfied with this product
30% of customers were not satisfied
Ratings & Reviews
Victoria H.
1/14/2025
That's quite impressive Fred, nice ride!
Fred
1/8/2026
Everything works just fine! Great product and support! Thanks E-t
Josh B.
1/8/2026
Alan
9/8/2026
Its been a year and to be honest, I never have to think about my tow setup. Its there, it works perfect like the day I got it. I cant recommend this any higher. Smooth towing without worrying about it.
Lazer S.
9/8/2026
Kate F.
12/17/2025
I wish you could mount it there Donald, but those stop-light-switch studs are only designed to hold the switch bracket. Adding the pulley bracket changes the spacing and alignment, which can make the brake lights stay on, not come on, or throw off the Invisibrake’s operation. The studs also aren’t meant to handle the side-load from the cable, so Roadmaster doesn’t recommend using them. For drilling stainless, the trick is a cobalt bit (M35 or M42), slow speed, steady pressure, and cutting oil so the metal doesn’t work-harden. Are you new to flat towing, or just getting a different vehicle set-up?
Michael R.
1/18/2024
Still working great
Mark S.
11/3/2025
Its a good choice because its easy in easy out. I have two jeeps that can flat tow, so i was covered for braking in either one
Do you have a question about this Flat Tow Brake System?
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Kate F.
4/23/2026
Thank you for the detailed review and for sticking with the install George. That is a tight space to work in, and we really appreciate you sharing both the challenges and your thought process along the way. You make some very valid points about the alignment sensitivity and adjustability of the switch. I agree, that kind of precision fit without an easy lateral adjustment can make the install more tedious than it should be. It does not make it right, and feedback like this is exactly what helps highlight areas for improvement. It is great to hear that it has been working reliably for you over a few thousand miles so far. Your habit of checking function during hookup is a solid practice and definitely the way to go with setups like this. I will be passing your feedback along to the manufacturer for review, especially your notes on the switch design and mounting adjustability. Also, thank you for including photos even with the tight space. They are very helpful for others tackling the same install.