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When you’re towing, it’s important to know exactly when your towed vehicle’s brakes are being applied. The Roadmaster Stop Light Switch Kit connects directly to the brake pedal instead of relying on air cylinder movement, giving your RV’s monitoring system a true signal every time the pedal is pressed. That means you’ll always know what’s really happening at the brakes, not just what the system thinks is happening.
If a supplemental braking system is set up wrong, it can keep pressure on the pedal and cause tire wear or brake damage. This kit prevents that by confirming the pedal returns fully when braking stops. It’s a simple safeguard that helps you spot issues before they turn into expensive repairs.
The Stop Light Switch Kit wires directly into the towed vehicle’s fuse box for a constant 12-volt current. That solid connection keeps your braking monitor working dependably every time you tow. It’s especially handy for setups without a tow position in the ignition, ensuring full function even when the key is off.
Each kit is custom fit for the vehicle it’s made for, so the installation looks clean and works seamlessly with your braking setup. Once installed, the system activates your motorhome’s brake monitor automatically whenever the pedal moves—no extra steps or adjustments needed.
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 everybody. Andy here, with etrailer.com. Let's take a quick look at this Roadmaster Stop Light Switch Kit. Now, this has been designed to fit your 2024 or newer Toyota Tacoma, and on custom fit parts, such as this kit, I do recommend taking advantage of our vehicle fit guide here at etrailer.com. Simply input the year, make, and model of your vehicle, and our fit guide will confirm if this will work for you, or if we have something comparable that will work for you. Now, with this kit, you will avoid damage to your vehicle by ensuring that your supplemental braking system is properly positioned and working effectively.
This is going to activate your RV's brake monitoring system, alerting you whenever your brake pedal in your towed car is applied. Other systems operate according to whether the air cylinder is extended, and it provides no indication of what is happening with the pedal itself. So if your supplemental braking system is improperly installed, it may be continuously pressing on the pedal, impeding it from fully retracting and possibly causing damage to your vehicle's tires and braking system. With Roadmaster's stop light switch kit, you will always know when the brake is being depressed, and you will avoid costly damage. So this is going to work great for any application that does not have a tow position in the ignition.
And this is going to wire directly into your towed car's fuse box for that constant current. And then, this, it will include everything that you need, including instructions, as you can see it right here. And this kit is made here in the USA. And, again, it includes everything that you see here on the table before me. So if you decide that this is going to be what you need, we would love to hear back from you regarding your experience installing this and using it.
And you can share your experience with us by dropping a comment or leaving a review on this product page. Well, that's gonna wrap up our quick look today. I do hope that it was helpful for you. Again, my name is Andy. Thank you for joining me.
.
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
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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.