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Most brake controllers stick out and clutter your cab, but this one keeps things clean and simple. The Redarc Tow-Pro Liberty tucks the main unit out of sight, while the only thing visible is a small knob that blends right into your dash. The control knob measures just 1-7/8" long x 9/16" wide x 3/4" tall, so it looks like it came straight from the factory. You can mount it wherever it’s easiest to reach without taking up knee space or interfering with anything else on the console.
Jerky stops and trailer sway are no fun when towing. The Tow-Pro Liberty’s proportional controller uses an internal 3-axis accelerometer that matches your trailer’s braking power to your own braking input. Whether you’re easing off the pedal or stopping hard, your trailer brakes do the same, keeping everything steady and in sync. It works with electric or electric-over-hydraulic brakes on trailers with up to 2 axles (4 brake assemblies), delivering confident, even braking every time.
Installing a brake controller doesn’t have to mean cutting and splicing wires. This kit comes with a vehicle-specific plug-in harness that snaps right into place for a fast, reliable connection. The main unit can mount anywhere within range of its 3-foot cable to the knob—under trim panels, behind the glove box, or anywhere out of sight. Once connected, calibration happens automatically as you drive and brake normally.
Everything runs through one small knob—adjusting braking power, hitting manual override, and reading color-coded alerts. Turn it clockwise toward 10 for more braking power or counterclockwise toward 0 for less. Pressing the knob activates manual override to steady sway or slow your trailer independently when you need it most. The LED light changes from blue to red as the trailer brakes engage, showing how hard they’re working in real time.
This controller is tested for safety and durability under strict international standards. It meets or exceeds both UNECE R21 and FMVSS 201, ensuring it performs reliably under tough conditions while keeping your interior safe from sharp edges or impact risks. With output rated at 9–16 V and 18 amps continuous (12 V DC max), the Tow-Pro Liberty is built to handle heavy towing without breaking a sweat.
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
Ratings & Reviews
The hardest part was getting the zip ties tightened around the module without completely removing the trim under the steering wheel. I chose near the shifter for my location so it’s easy to reach but still out of the way.
Working well through one season. Hoping for many more.
The controller and dash knob are solid and nicely crafted. Both are made to be easy to install. The dash knob works great and is simple and easy to use. The manual is well written, and has detailed and very useful information. Be sure to get the REDARC Tow-Pro Harness (TPH-025), too, which is needed to complete the hookup of the controller.
Mounting the brake controller up and out of the way under the dash of my 2023 Tacoma required some thought. I chose to fabricate a bracket from a piece of 3/4" aluminum angle (bolted to the underside of the dash) and anchored the brake controller to it with zip-ties.
I love the separate controller and knob. The knob fit into a factory blank and the end result is factor clear. We picked up of 7x16 cargo trailer yesterday and the controller worked perfectly.
With the vehicle specific harness the install was very straight forward.
Highly recommended
Fast shipping
It fits a 2025 4runner sr5 with a hitch but no tow package.
Easy to plug in and install. Tuning it is not explained clearly. There are several videos on what lights you will see when setting it up. Confusing.
i have ordered 2 of these in the last 2 years and both times the kit was missing parts, last one i ordered the knob was missing and this last order the nut to hold the dial in place was not in the box. the product is good, but replacement pieces are not easy to find, fortunetly i had to order a complete dial kit for the one i ordered last year and i saved the rest of the parts.....
Expedited shipping was super fast with no problems. I installed the unit myself and it was fairly simple. I recommend getting the exact fitting wire harness (huge time saver) and I’d recommend getting and exact fit knock out to install the dial in. (Another big time saver). I drilled a hole in my own blank or knock out thingy and I’m pleased with it but it took a little time. I’ve got a 2010 Honda Pilot. Funny thing, after rushing to install the brake controller, our trailer had to go in for repairs before we even completed the transaction. It will be another month before I actually use the brake controller.
Etrailer is great. Service is outstanding even the return policy. My go to for trailer needs
On the Promaster when you take the BCM cover and upper dash cubby hole piece out there is a spot right above the BCM. Since the Redarc can be mounted any direction I simply added two 4mm Rivnuts to the bracket and bolted the controller in with stainless hardware (Bolt, washer, lock washer). The rest of the dash is kind of hard to find a spot, as I wanted it reachable with my right hand as I drive with my left typically. The lower instrument panel knee bolster comes down with a few screws and the inner dash piece has a hole from the factory that is perfect for the switch wiring. I used a unibit drill and a small square file to make the hole for the switch. The 90 degree cat cable is nice as it sticks through the inner hole and holds itself in place so it doesn't fall out into the bakc of the dash during assembly of the switch and there is enough room in the rear to not impede anything factory. I used a tap from O'Reillys's to tap into the brake wire suggested by the Mopar trailer wiring install guide. Typically I'd solder it, but it looks way better than a typical scotchlock connector, which I would not use under any circumstances. Ill chck its tightness in a few months and see how it holds. Used the factory wiring harness runs to run to the battery box under the floor. Used proper friction tape and braided wiring loom (O'Reilly's find) for a factory look. Seems to work ok, but need a trailer with brakes now.
Gen6 Toyota 4Runner with out factory brake controller. Straight forward instillation. Find an unused switch location and install the control knob in the blank spot . Custom adapter made the wiring as simple as plugging it in and hiding the wire.
Installation was easy and fairly fast. The hardest parts were finding the harness side connector and the main unit install. I picked the hardest spot under my dash to install the control unit. I wanted it out of the way, otherwise the entire job, from unboxing to engine on, took under 30 minutes (not counting the 15 minutes installing the control unit two feet up into the dash, that was on me). There were several other spots that were easier, but I didn’t like the placement.
The RedArc trailer brake came with a pigtail and in my 4Runner glove box was the other side pigtail the connects to the unused plug that is factory wired. I would have to splice the factory pigtail to the RedArc pigtail, where wire colors didn’t match. This eliminated the splicing completely and made it plug and play and super clean.
This controller works amazingly well, considering the ease of installation, especially with the vehicle-specific wiring harness. I made several trips between Missouri and Colorado last year, loaded and unloaded, and a small twist of the dial compensated for the weight differences and braking requirements.
I didn't realize when I bought a new Frontier truck that I could no longer use traditional underdash brake controllers like I had for past 40 years. This meant that this Redarc was one of only a few brake controllers that I could use.
Mounting it was a bit tricky and the supplied instructions weren't good. Fortunately others before me had figured it out and posted better step by step instructions with pictures.
The brake controller itself works very well and provides the best and smoothest braking control I've ever experienced with my twin axle camper on multiple trips this last summer including one trip of over 1,000 miles around the UP of MI and northern WI.
The break controller works great...no problems. I've since sold the single axle trailer and purchased two more, one single axle new and one double axle used. I plan on stripping the cargo trailer and replacing the breaks and anything else that needs it for the suspension, creating a type of mini-home or tiny home on it. Thanks for reaching out. I will use your services for this new build. Thank you and keep up the good work!
Being new to towing a larger trailer requires research. After doing a lot of it, both through user reviews and manufacturer websites, we landed on the Rearc Liberty Brake Controller for our Tacoma. We have just over 1000 miles towing with this unit. It has performed extremely well. Towing for us includes city, highway, mountains, and even off-road to access our mountain home. Installation was straight forward and the ability to install the controller in virtually any position is an added bonus. I was able to install the dash knob in a blank panel giving the Tacoma a factory appearance, and controller located under drivers seat. I installed this unit on a non tow package Tacoma, so wiring was a bit intimidating at first. But using etrailer’s web site as a reference had everything operational in a couple afternoons. Great product so far and we look for years of use. Highly recommend.
I purchased the Redarc Liberty brake controller because I couldn’t find a place to mount my Tekonsha where I wouldn’t bash a knee or shin on it or cover an airbag.
So far, I’m very happy with the Redarc Liberty brake controller; although, I haven’t used it for towing yet, and I’m not sure it is operating properly. Apparently, I should have blue lights while it is learning which way the control unit is oriented but I don’t have blue lights.
Anyway, let me share information on the installation. I purchased the wiring harness for my vehicle, which I highly recommend as it was same cost as the universal harness, and a big time saver. I did not buy the blank switch panel for the switch installation as another reviewer stated he was able to modify the original switch blank. Big mistake, I highly recommend buying the appropriate switch panel for your vehicle. My Toyota blank switch panel was excessively complicated so I had to saw and melt a pile of plastic (see the picture) out of it without damaging the visible portion or the clips which hold it in.
Finding a suitable location to secure the controller up under the dash is a challenge with modern cars. After removing two pieces of plastic trim, I did manage to pull the panel below the steering column far enough out to complete the install. The unit it does look good. Very clean.
We’ll be towing the big trailer next week so I hope it works.
VERY happy with the ease of installation. I had an insert made on a 3D printer to mount the control where the factory brake would have mounted.
Matthew
1/17/2026
Still works great! No problems and I would definitely recommend it.
The Redarc Liberty was exactly what I wanted for my ‘20 Ridgeline. I ordered the custom pigtail and mounted everything behind the dash panel on the left side of the steering wheel. There was a blank switch cover available on the dash panel and I cut away the webbing on the back side of it (very soft plastic, Swiss Army knife) which allowed the control switch to fit right in, between the retaining clips of the blank. The drill bit sizes indicated in the instructions were not big enough for the control knob and plastic bezel so I just increased the bit sizes until the holes were big enough. Honda provided a pigtail with bare ends; I didn’t want to crimp any wires. Honda also said to put their provided fuse in slot 3 in the under hood aux fuse box; the fuse was the wrong type and there was already a 20a fuse in the appropriate slot. My Honda service tech advised Honda usually includes the wrong style of fuse and also usually installs the right one anyway. Go figure. I finished the install the night bf I picked up my new TT; took about 3 hours. It wasn't difficult but I’m pretty OCD. The most work involved routing the wires so as to avoid pinching or bending them too severely. I set the control on 5, tested it with the trailer hooked up in the sales lot and bumped it up to 6. I never felt the trailer on braking at all on the way home. Very smooth and I like the fact that it looks like a factory install. I couldn’t be happier with this controller. E-trailer’s video for the install was a great help, although I mounted the control box in a slightly different spot. This is my second purchase of towing accessories from E-trailer and I am pleased with the service and pricing both times.
Its simple and fits in the dash like it should be there. It controls the trailer as it should. it only lights up when the trailer is connected so you don't see any annoying light during normal driving. I would recommend, it has worked for me. installed in a 2016 Jeep Grand Cherokee
I am very pleased with my purchase and installation of the Redarc Tow-Pro Liberty Brake Controller w/ Custom Harness in my 2005 Toyota Tundra. Thanks to Brittany for her help in determining the product that was best for me. Installation was straightforward once I found the ground point on my truck. I am confident that the unit is well grounded and it will give me long lasting service. Thanks to Brittany, I was sure that I had ordered the right unit for my needs, and that I would be able to install it myself. Product and service was excellent!
Installed it on my 2022 Subaru Outback Wilderness. Ordered this without the harness so had to order that separately. I think the RED52VR is what I should have ordered to include the harness. Did not like the access and the very small wire gauge on the brake pedal the instructions said to tap into so when running the wire from the 7 pin kit ETBC7 from the back of the car I ran a 3rd wire which I tapped into the brake signal going to the factory 4 pin control box in the spare tire well. I ran the wires up underside the driver side and up through the floor by the drive door rather than into the engine bay. Found a neat location to mount the controller and ground wire. Installed the control switch after drilling and dremelling the blank as shown in the great video etrailer has. Unit calibrated and worked just as advertised. Been on short test run. Need a longer trip to experiment with the brake level setting.
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Victoria H.
1/21/2025
That's super neat and looks sleek too, Matthew! What are you hauling?