When you’re towing, you want to be sure your braking system is actually doing its job. The Roadmaster Stop Light Switch Kit makes that easy by activating your RV’s brake-monitoring system whenever the towed car’s brake pedal is pressed. Instead of guessing based on whether an air cylinder has extended, this setup tells you what’s really happening at the pedal. That means real feedback on every stop and the confidence that your braking system is working as intended.
A supplemental brake that presses too long can quickly lead to tire and brake wear. This kit helps prevent that by letting you know if the brake pedal is ever being held down when it shouldn’t be. If something’s mis-adjusted or sticking, you’ll see it right away through your RV’s monitor. Catching that early keeps your towed car’s brakes and tires from overheating or wearing unevenly.
For tow setups that don’t have an ignition “tow” position, this system still keeps everything powered and responsive. It wires directly into the towed car’s fuse box for a consistent 12-volt current, so you get dependable operation every time you tow. The straightforward wiring design makes it a clean, durable connection that’s ready for long-term use.
Once installed, you’ll always know exactly when your towed car’s brakes are applied. The kit ties into the RV’s existing monitor so braking feedback is automatic—no extra steps or guesswork. Every time you hit the brakes, you’ll have confirmation that both vehicles are responding together for smoother, safer towing.
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.
Today we're going to be taking a look at Roadmaster's line of custom stoplight switch kits. You'll want to refer to our fit guide for the appropriate switch kit for your vehicle.Here on our motor home we have our indicator light that's connected to our stoplight switch. When this light illuminates, we know that our braking system that is installed is applying the brake pedal in our towed vehicle. And we're going to get this signal thanks to our stoplight switch. Here when I hit the brake in our motor home, the light's illuminated so I know that our braking system is working properly.This stoplight switch is going to provide you with an additional brake stop signal. This is important if you're flat towing a vehicle that doesn't have a brake signal when in tow mode.
Without a signal you'll have no way of monitoring whether or not your brake pedal is being depressed. You can use this stoplight switch to connect to the indicator that comes with your supplemental braking system so you can verify for sure that your brake pedal's being depressed when you hit the brakes in your motor home.In most instances it'll be well hidden or blend in with the rest of the wiring down below so you won't even notice it. Here you can barely even glimpse the switch itself. And the kit comes with everything you need to get it installed. This includes the switch, the wiring, the fuse and the custom bracket that's specifically made for it to mount right onto your vehicle.
The bracket's really what makes it custom for your vehicle. It allows the switch to mount seamlessly and easily adjusts to the contour of your brake pedal.A less common use is for a brake controller. If your vehicle doesn't have a compatible brake signal for your brake controller then you can install one of these and get that signal for your brake controller to easily hook up to your trailer.And that completes our look at Roadmaster's line of custom stoplight switch kits.
Ratings & Reviews
Attached and adjusted easily. Nice to be able to use an existing wire in the 7 pin to 6 pin cable to route the included wire under the RV to the dash monitor.
I purchased this product for a 2018 Wrangler JL. It is extremely time consuming and near impossible to install a trailer brake controller in this Jeep without it.
Ive installed the ble ox base plate bx2654 and the remote battery disconnect #766. Installation was easy great instructions to follow. Also installed 12 volt outlet kit #9332. I'm installing led bulb and socket kit 152-led. Great so far.
This is the second switch I’ve bought. The fuse holder could be designed a little better. Perhaps with the wire out the top rather than the side.
Great product installed very easily. I also used this switch to install a Brake Controller. By using this I did not have to tap into the Wrangler electrical system for the Bake Controller.
Did not use
The instructions are a little difficult to follow but it was easy to install
Easy installation. I had an issue getting the kit ordered, but the customer service agent was phenomenal in her assistance getting it resolved.
Mount was good and directions easy to f ollow.
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.
etrailer’s installation video was very helpful. However, the mounting bracket holes on either end seem to be the same size (the video and instructions state that the switch fits into only one end but for me it fit into both). Consequently, it is not clear which side of the bracket to use for the switch vs the vehicle stud. One other installation hint, perhaps unique to the Wrangler Rubicon or Wranglers with upgraded audio/Uconnect, there is an electronic module (3”x4”), mounted to the dash framework behind the lower dash panel, that must be dismounted in order to allow access to the bracket mounting location (see photo).
It works as designed. Tricky for this old fat guy to work under the jeep dash but eventually got it installed and adjusted.
Was disappointed that your site said this was the part I needed so I ordered it. Then realized it was not correct part. Called next day to cancel and Oder correct part. I was told I could not cancel it and would have to pay to ship it back. The correct part which was ordered second came 2 days before first part. To get a refund I still had to pay to ship it back. Other than this trailer has been good to work with and quality parts.
Thank you, order arrived as promised, and install was easy and fit my 2025 Jeep Grand Cherokee Overland perfect to operate my brake light on my Motorhome dash.
Easy installation. Fit perfectly in my 2014 Grand Cherokee.
Ill give it 3 stars because I had to shim the bracket to make the plunger line up with the brake arm. But it works well so far.
It is my opinion that the universal brake light switch is the easy way to go. Hardest part doing the DIY way is the place you are working in. I.have a few sore spots trying to get underneath the steering wheel. The benefit is you have instant info that the switch works. A light comes on when you push the break pedal
Works great fairly easy install. It has been in use for the last 8 month's with no issues. Here may be some helpful hints that I found when installing. Use 10-12" long extension for 13mm nut (left side of opening panel that was removed). Install bracket. Adjust plunger & backing nut by feel. Remove bracket. Install switch with ring washer & nut. Crimp red & green wires on switch wires. Reinstall bracket under dash.
Roadmaster products are great, very pleased with the superb instructions. Very difficult to mount the pulley for the invisibrake in my Ford Maverick. Trying to drill stainless steel behind the brake pedal was near impossible. Could a bracket for the pulley be mounted on the same studs as the Stop Light Switch?
I have a ‘23 Bronco with the Lux package. The Bronco had a factory brake switch in the spot this thing would go. Advice was unclear whether I could use a factory wire to install my brake controller. I went with the wire that lit the test light when brakes were pressed (key on). I think it was violet with a stripe at the plug for a factory Brake controller. I don’t have the factory tow package. Seems to work but not yet tested with a trailer. Only 3 stars because of the uncertainty. I’ll use this switch on a different project.
Product works great...But was shorted the female connector to terminal 1...Cost over 5 dollars at Auto Zone.As no one sells just one.....Its in the picture...Not in my parts bag...But a perfect fit on the brake switch mount .Three stars only because I had to go buy a connector to complete the job.
One year later and I haven't had to touch this system even once. It just works, all the time, every time. Very happy with this kit. Works perfectly in my 2019 Toad (Jeep Cherokee).
I couldn’t use the towed vehicle’s brake light circuit on the last two pickups I’ve set up. On the truck before this I robbed a little refrigerator switch that turns on the light when you open the door and rigged up my own. Alas, that wouldn’t work on this newest GMC Canyon. Then I found this device. Wow, what a quick and easy installation. It works perfectly.
I do have a suggestion for ETrailer. Show the actual switch dimensions in your listing. Though the actual switch is quite small, I was worried I wouldn’t be able to make it fit. With nothing but pictures and nothing for scale, it was a concern.
I installed the item in my 2024 Bronco to support braking indication in the motorhome while being towed, since Ford does not include one these days. As far as I can tell, this is the only commercially available kit to avoid cobbling up your own design. It is tedious to install mechanically and, especially tedious to adjust transverse mount position and depth of travel. The button on the switch is too small, requiring very precise alignment to the brake pedal arm (approx 1/4" wide) in the transverse direction from the switch movement. There is no screw type adjustment in that direction so bracket bending/and or bracket mounting spacers is required. I am also afraid the switch button being small and made of some type of poly, it will slip sideways, deform, or wear with even the slightest offset and begin to push the bracket aside. However, it has worked in a few thousand miles of towing behind a motorhome so far. I will keep an eye on this and test function whenever hooking up to tow (a normal practice anyway). I kept thinking it would be easier to use a long lever low force microswitch instead of a tiny soft-tipped, rather hard spring or drag, pushbutton, which would require its own mounting design. Maybe a small highly adjustable ball clamp mount work with a microswitch as well. But I must resist my engineering background tendencies in exchange for getting the job done! Sorry for the quality of the photos. It is in a difficult place for phone camera.
Thanks everyone at etrailer for your help and quick response and shipping! My project turned out really great as you can see in the pictures I have included. The plug for the removable holders I 3D printed. Thanks Fred
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