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When you’re towing, you need to know exactly what’s happening with your toad’s brakes. The Roadmaster Stop Light Switch Kit activates your motorhome’s brake-monitoring system every time the towed vehicle’s brake pedal is actually pressed. Unlike systems that only track cylinder movement, this kit ties directly into the pedal to show true brake activity. That means you’ll know right away if the brakes are working properly—no guessing, no hidden malfunctions.
A misadjusted braking system can ride the pedal too hard or fail to release fully, which can ruin tires or overheat brakes. By wiring directly into the towed car’s fuse box for a constant 12-volt current, this kit makes sure your supplemental braking system is functioning the way it should. You’ll have peace of mind knowing you’re avoiding unnecessary wear or damage during every mile of travel.
Some vehicles don’t have a dedicated tow setting, which can make it tricky to get a reliable brake signal. This kit solves that by operating independently of ignition position, giving you a consistent readout anytime the pedal moves. It’s a dependable way to keep your monitoring system accurate even when your ignition must stay off during towing.
Built with the right bracket and hardware, the Stop Light Switch Kit mounts securely under the dash and aligns with your brake pedal for a snug fit. Owners mention the metal bracket fits perfectly and appreciate how once it’s in place, it just works. It’s a simple piece of gear that adds confidence to every flat towing setup.
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.
Ratings & Reviews
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.
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
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Mark R.
12/21/2022
Great I love it