Redarc Tow-Pro Trail Brake Controller w/ Custom Harness - Dash Knob - Off-Road Mode - Up to 3 Axles
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2001 Audi S4
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2001 Audi S4
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Most brake controllers stick out and take up knee room, but the Tow-Pro Trail tucks nearly everything behind the dash. All you see is a small knob on the console—just 9/16" wide and 1-7/8" long including the knob. It looks like a factory switch, not an add-on. That single knob handles it all: adjusting brake power, pressing manual override, and showing color-coded alerts as you drive.
Slow crawls through sand, mud, or steep grades can make towing unpredictable. The Tow-Pro Trail’s off-road mode gives you direct control over trailer braking no matter what your tow vehicle is doing. Set it light in soft terrain so the trailer doesn’t dig in, or turn it up on descents so it doesn’t push from behind. To activate, rotate the knob to 0, apply your brakes, then push down twice within one second—the LED glows green when it’s ready.
No jerky starts or stops here. A built-in 3-axis accelerometer senses your vehicle’s braking and sends an equal amount of power to the trailer brakes. Heavy pedal means strong braking; light pedal means gentle braking. It works with electric and electric-over-hydraulic systems on trailers with up to 3 axles (6 brake assemblies). The result is balanced braking that keeps everything steady and reduces wear on tires and pads.
Splicing wires is a pain, so this setup skips that entirely. The included plug-and-play harness connects right into your tow port and the controller module. The main unit can mount anywhere within reach of the 3' cable—under trim panels or behind dash plastics—using screws, tape, or zip ties (not included). A universal mounting panel comes in the box for a clean finish that looks built in from day one.
The Tow-Pro Trail runs on 12V or 24V systems with an output range of 9V–32V and handles 25 amps continuous current. It meets UNECE R21 and FMVSS 201 safety standards for durability inside the cab. Once calibrated—about twenty normal brake applications—the LED shows solid blue, and you’re ready to tow with consistent performance wherever you go.
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
Ratings & Reviews
Super product! Easy to install and setu p.
I wasn’t sure spending the extra money on this was necessary cause I had always been using the other style controls for ever and they worked fine. I bought this because of the limited leg room under my dash on my new rig. After installing this, not only did I have more refined braking control, I mounted the control knob where I didn’t have to hunch over to reach for adjustment or manual braking. And now the reason for buying it was just an added bonus.
Just works very well.
Worked well on our 2024 Bronco. Took a while to get in and run the wiring but overall it’s working well.
Easy install and calibration. The correct product for my needs.
The Redarc controller that I ordered to install in my Lexus GX460 was perfect! I ordered the Tow Pro Trail version. The harness to connect the factory trailer harness under the dash was the correct one for my Lexus. lling the controller that se are a little more work than installing the ones that hang under the dash, but well worth it!
Awesomeness... Thank you.. HELL YEH... Merry Christmas to All at etrailer
Great workmanship and easy to install. I installed the main unit right below the steering wheel behind the panel per the video by redarc. If you install the dial where the 12v outlet plug is currently located, you can find another place to put your 12v port like i did. It was simple to adjust to my tandem axle trailer. Glad I purchased this instead of the more expensive factory controller.
Easy install, works as it should. Happy with purchase
Easy to install. And, with plug n play for the Bronco, once the trailer was hooked up it was ready for use.
For my 2021 Gladiator with factory tow. Everything including specific harness and little round mount for the control knob to replace the 12v outlet was in the kit. Hardest part of install was learning how to open the dash panel. The controllor powered up and is working as expected on normal road driving. Very straight forward and no struggles.
Installation was a breeze with the custom harness. Plug and play with all the electrical components. I adapted a marine surface mount 12 volt plug housing as a mounting solution for the control knob, eliminating the need for any drilling.
2025 Ford F250 weak trailer brake. Its a common problem with at least the 2025 models. I had it into the dealer 7 times under warranty for the weak trailer brakes and the dealer can't fix it. Its a Ford problem so I had to fix it myself. The RED44UR is the solution. If you are having weak trailer brakes on your 2023 to 2026 f250/f350 the Redarc RED44UR will probably solve your issue. It worked for me.
Highly recommend!!
Installed in a modified Tacoma, with a serious off-road trailer. I use this system camping / off-road 40+ nights per year, mostly in the Sierra Mts. I have blown 2 other brake systems which caused unsafe conditions. I had just a few hours to install the RedArc system before leaving on a trip. The truck specific plug and play setup was quick and easy with a very clean simple dash button. It has been dependable over the year.
Love it when you get the right parts, at the right price, at the right time.
Excellent product. Updated from a Curt wireless Bluetooth controller. The installation of the Redarc is plug and play. No modifications of any kind required. Being able to manually set brake force and to operate the trailer brakes independently is just great. Highly recommend.
Its great. Works just as advertised. The only gripe is that the provided switch slot is not the factory one for the frontier and it moves around. I ended up modifying the blank switch cover and using that instead, but overall a great kit. Wiring was easy with the provide harness for the frontier.
I always deal with etrailer , best prices , quality items , great fast shipping
Parts are perfect for my vehicle. Etrailer makes it too easy. Great comunication also.Plug and play just like advertised.
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