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Most brake controllers stick out and take up knee space, but this one hides the main unit behind the dash. All you see is a small knob on the console—just 1-7/8" long (including knob), 9/16" wide, and 3/4" tall. It gives your interior a clean, factory look while keeping full access to controls. That single knob handles everything: adjusting brake power, triggering manual override, and showing color-coded alerts.
Rutted trails and steep descents can make towing unpredictable. Off-road mode gives you direct control of the trailer brakes with a preset power level, independent of your vehicle’s braking. Keep power low for sand or mud so the trailer doesn’t dig in, or raise it on downhill grades so it doesn’t push you forward. To activate it, turn the knob to zero, brake once, tap twice to confirm, and watch the LED glow green when engaged.
The Tow-Pro Trail senses how hard you’re braking and matches your trailer’s brakes accordingly. Its internal 3-axis accelerometer measures inertia to apply just the right braking force—hard stops when you need them and gentle deceleration in traffic. The result is even braking across your setup with no jerk or push-pull effect. It works with electric and electric-over-hydraulic brakes on trailers with up to 3 axles (6 brake assemblies).
The controller installs in two parts—a small main unit and the dash knob. With almost no mounting restrictions, you can secure the main module behind trim using screws, tape, or zip ties within the 3' cable reach to the knob. The included custom harness plugs directly into your vehicle wiring—no splicing required. Once mounted, calibration happens automatically as you drive.
This controller is tested to meet or exceed UNECE R21 and FMVSS 201 safety standards for durability and occupant protection. It runs on 12-volt and 24-volt systems, outputs 9V–32V at up to 25 amps continuous, and carries a 2-year warranty—ready for heavy use on and off the road.
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 brief look at this REDARC Tow-Pro Trail proportional brake controller with custom wiring harness. Now this brake controller wiring harness has been designed to fit your 2015 and newer Ram 1500, 2500, and 3500, then your 2019 and newer Ram 1500 Classic, then your 2016 to 2019 Ram 4500 and 5500. On custom fit parts such as this brake harness, 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 brake controller will work for you or if we have something comparable that will work for you. Now this brake controller is going to require minimal dash space in your vehicle and it's gonna be very simple to install and operate.
It has a factory look and feel, looking like it's always belonged in the dash or console of your truck. This brake controller activates your trailer brakes in proportion to your truck's braking action. It will automatically adjust the trailer's braking based on the deceleration of your tow vehicle. Now this brake controller comes 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 you can have exactly the level of power output you need for any situation.
So this brake controller will be perfect for off-roading or adverse weather conditions. In this User-Controlled Mode, this Tow-Pro Trail will apply your trailer's brakes with the same preset amount of power each time you activate the brakes in your vehicle. You're just gonna set the power low if you're towing through sand or mud so that the trailer doesn't stop with too much force and act as an anchor. Or when you're 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 your tow vehicle. Now this control knob will mount in your dash or your console any really easily accessible area, and it's going to allow for a quick and easy adjustment of the braking power with just the turn of the dial here.
This is also going to provide manual override by just pressing the knob, and then that's going to activate the brakes. And then it's going to offer you simple diagnostics with a bright colored LED in the dial. Now this main unit here, this is going to install out of sight. So what's nice about this setup is there's not gonna be any more banging of your knee on a bulky controller underneath your steering wheel when you're getting into your truck. There's not gonna be any interference with airbags or any other accessories in your vehicle.
And of course, there's no hard-to-reach override lever or impossible-to-read screen. This can be mounted in any position, any direction and angle with the included mounting kit that you see here on my table. There's no complicated wiring because of the custom fit harness that includes for your Ram. You just plug it in and you're on your way. Now if you do not already have a 7-way plug at the back of your truck, take a look at our exclusive 7 and 4-way brake controller installation kit that you see there on your screen, and you can get to that kit by punching in that code there, the item number that you see there on your screen, the ETBC7. Pop that into the search field of our website. That will take you to that kit if you are in need of a 7-way at the back of your truck. Now this kit, this brake controller kit, is going to meet or exceed both the UNECE R21 and the Federal Motor Vehicle Safety Standard 201 regulations for sustainability and safety. This brake controller is for trailers with up to 3 axles, 6 brake assemblies. It's designed for use with electric or electric over hydraulic trailer brakes, and it's gonna work with 12 volt and 24 volt electrical systems. Let me give you some real quick measurements of this brake controller itself. So looking at the overall length, 4 inches. The overall width, about 3-3/8 inches. The overall height, about 1-1/8 inches. Instructions are also included to guide you through the installation and operation. And I think that's gonna 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.
Customer Satisfaction Score:
86% were satisfied with this product
14% of customers were not satisfied
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.
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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.