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Most brake controllers stick out and take up knee room, but this one hides everything except a tiny knob on your dash. The control knob measures just 1-7/8" long (including knob) x 9/16" wide x 3/4" tall, while the main unit mounts out of sight behind the dash. It looks like it came straight from the factory, not bolted on after the fact. The knob handles all adjustments, manual override, and LED alerts while keeping your cab clean and open.
The Tow-Pro Trail’s proportional control uses a built-in 3-axis accelerometer to match your trailer’s braking to your own. Light pedal input means gentle trailer braking; a hard stop gets the same force from the trailer. It works with trailers up to 3 axles and supports both electric and electric-over-hydraulic brakes. The result is steady, even braking that reduces wear on your tires and brake pads.
Steep descents, sand, or mud can make towing unpredictable. Off-road mode gives you direct control over your trailer brakes with a preset brake force—independent of what your tow vehicle is doing. Keep it light so the trailer doesn’t dig in or increase it to hold back on downhill grades. Just rotate the knob to 0, press it twice within a second while braking, and when the LED turns green, you’re ready for rough ground.
You don’t need hours of wiring or bulky hardware to get this controller running. A custom plug-in harness connects directly to your tow wiring and controller. The main unit can mount almost anywhere within reach of the 3' cable between it and the knob—secured with screws, zip ties, or tape. Once installed, calibration happens automatically as you drive.
This unit meets or exceeds UNECE R21 and FMVSS 201 regulations for safety and durability. It runs on 12-volt or 24-volt systems with an output range of 9V–32V and delivers up to 25 amps continuous output current. Backed by a 2-year warranty, it’s designed for confident towing in all conditions.
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 look together at this Redarc Tow-Pro Trail proportional brake controller with custom wiring harness. Now this brake controller kit has been specifically designed to fit your 2016 to 2023 Toyota Tacoma and your 2015 to 2021 Tundra. Now on custom fit parts such as this brake controller kit, I do recommend taking advantage of our vehicle fit guide here at etrailer.com. Just input the year, make, and model of your vehicle, and our fit guide will confirm if this kit will work for you or if we have something comparable that will work for you. Now what's really nice about this brake controller kit from Redarc is that it's gonna require minimal dash space in your Toyota, and it's going to be relatively simple to install and operate.
This is going to have a factory look and feel to it. It's gonna look like it's always belonged in your vehicle, and the typical person would probably never know that you actually have a brake controller system installed in your Toyota. Now this brake controller is going to obviously activate your trailer brakes in proportion to your Toyota's braking action. It will automatically adjust your trailer's braking based on the deceleration of your tow vehicle. And this brake controller does come with a unique feature that's going to let you respond to any terrain or weather that you meet while on the road.
The user controlled mode is going to give you direct control over your trailer's braking, so that it can have exactly the level of power output that you need for any situation. So this is going to be perfect for off-roading or adverse weather conditions. And in this user control mode, this tow pro trail will apply your trailer brakes with the same preset amount of power each time you activate the brakes in your Toyota. You can set the power low if you're towing through sand or mud, so that the trailer doesn't stop with too much force or and act as an anchor, or when on a steep descent you can set the power to a higher level to ensure that the trailer's momentum doesn't cause it to push against the tow vehicle. Now the star of the show is this control knob, which is going to mount in your dash or other easy accessible area.
And it's going to allow for quick and easy adjustment of the braking power with just turn of this dial. And then it's also going to provide manual override by just pressing the knob to activate. And it's also going to offer simple diagnostics with a bright colored LED dial. I did want to point out that you're going to have additional inserts or blanks here for the knob so you can get that look that you are looking for for your particular Toyota, whether it's the Tacoma or the Tundra. So you're gonna have several options here to get that fit and that look that you're looking for with these three inserts or blanks.
So obviously this main unit is going to install out of sight. And you're not gonna have to worry about banging up your knee anymore on a bulky controller. You're not gonna have to worry about interference with airbags or other vehicle accessories. And of course there's not gonna be any hard to reach override lever or impossible to reach screen. And this spray controller can be mounted in virtually any position, direction, or angle with the included mounting kit that you see right here. So that's a nice addition to this kit is that the mounting kit is included with this. There's not gonna be any complicated wiring. This custom fit harness is going to let you plug in and go. And I do wanna point out that if you do not already have a seven-way plug at the back of your vehicle, take a look at our exclusive seven and four-way brake controller installation kit. We here at etrailer.com have put this kit together for you in case you are in need of a seven-way at the back of your Toyota. This will also give you that four-way as well, so you'll have both of those options at the back of your vehicle. So if that's something that you need, you can take that part number that you see there on your screen, ETBC7, pop that in the search field of our website. That will take you to that kit and you can add that to your order. So this is going to meet or exceed both U and ECER 21 and the federal Motor Vehicle Safety Standard 201 regulations for sustainability and safety. And this brake controller is going to be for trailers with up to three axles, six brake assemblies, and it's designed for use with electric or electric over hydraulic trailer brakes. This is gonna work with your 12 volt or 24 volt vehicle electrical systems. One other piece of information that I wanna leave you with in case you are wondering about the size of the unit itself. We're sitting pretty close to four inches long and about 3 3/8 inches wide or so, and about an inch or an 1 1/8 tall. Just kind of give you an idea of the size of the brake controller itself. Well, I think that's going to wrap up our real quick look today. I do hope that our time together was helpful for you. Again, my name is Andy, thank you for joining me.
Ratings & Reviews
Brooke M.
2/3/2025
It looks great, Robert! Thanks for sharing your ideas and the photo.
Mike L.
12/23/2025
Merry Christmas, Lester! Thank you!
James
12/25/2025
This is my second brake redarc brake controller this one is in my wifes Bronco. I love that its a smart controller because my RV has an engine brake which engages and the brake controller recognizes and works together. Im probably going to purchase a third one for my Dodge Ram pickup because its the best brake controller Ive ever used.
Do you have a question about this Trailer Brake Controller?
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Lazer S.
6/24/2026
Glad to hear it's working well for you, Greg! Redarc brake controllers are probably the best ones currently on the market and are the only ones I recommend anymore. They work extremely well and are super reliable, so I would be willing to bet it will continue working well for years to come! ^___^ Where do you typically go in the Sierras? Growing up, we used to go to Mammoth every summer for a mountain biking trip. Did Mt Whitney once too. Remember that being hard, to put it lightly.