Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.
Most brake controllers stick out and take up knee room, but this one tucks the main unit behind the dash. All you see is a small knob on the console—just 1-7/8" long and 9/16" wide. It looks like a factory switch, not an aftermarket add-on. That single knob handles everything: adjusting brake power, hitting manual override, and showing color-coded alerts that change from blue to red as braking power increases.
No jerky stops or trailer push. The Tow-Pro Liberty uses an internal 3-axis accelerometer to sense how hard you’re braking and sends matching power to your trailer brakes. It works with up to 2 axles (4 brake assemblies) and supports both electric and electric-over-hydraulic setups. The result is smoother braking, better control, and less wear on your whole setup.
Wiring a controller doesn’t have to mean splicing wires. The Tow-Pro Liberty comes with a custom plug-in harness that connects right to your vehicle wiring. The main unit mounts anywhere within reach of the 3' cable that connects it to the knob—secured with screws, tape, or zip ties (not included). Once mounted, calibration happens automatically as you drive and brake normally.
This controller is tested to meet or exceed both UNECE R21 and FMVSS 201 standards for safety and sustainability. It delivers consistent power—rated at 18 amps continuous with an output range of 9V to 16V—and stays rock solid even on long hauls or rough roads. The system runs on 12V DC and includes a 2-year warranty for added peace of mind.
Customer Satisfaction Score:
94% were satisfied with this product
6% of customers were not satisfied
Ratings & Reviews
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
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.
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.....
Etrailer is great. Service is outstanding even the return policy. My go to for trailer needs
Ram 1500 eco diesel. Plugged in and works immediately. No flashing or reseting required.
Just installed this brake controller on my 2024 Ram 1500 Rebel. The hardest part was reaching and freeing up the factory wiring to make the connection. Haven’t towed the trailer yet but seems to work just plugging into the trailer lead. Way better installation than a universal brake controller with all the associated wiring.
I like the clean look on the dash. Hooked up camper after installing fifth wheel hitch and went for a drive to set controller. Worked great. Good product.
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.
Easy install. Works as designed. 2024 Ram 1500 4x4.
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 boughtthis because the dealership quoted me $1200 for a 2020 ram 1500 controller. It doesn't integrate to the dash but works great. I tow occasionally and have used it for 2 different trailers and it worked well. I'm not mechanic but after watching the video I did the install in 70 minutes. I've had the ram integrated controller on 2 different trucks. I liked the oem better, but for the $ difference it is a no brainer.
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.
This is the best brake controller I have owned. So easy to install especially if you by the harness for your year vehicle looks great to no ugly controller taking up room
As must purchase
John
4/30/2026
Great no issues at all
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.
Could very well be the easiest brake system to install.Functions superbly and most of all not intrusive like the old style brake controllers.If you are thinking about purchasing one watch the install videos on etrailer, they have a few for different models of vehicles. Make sure to get the adapter cord that fits your car or truck, makes installation a breeze. Highly recommend!
Gwendolyn Y.
4/24/2025
Sounds like Redarc is really a show "stopper"! I'm happy to hear the install was a breeze!
William
4/24/2026
The Redarc Brake controller has worked with no issues since my install. I believe the most simple to install and setup on the market. I would highly recommend to get the adapter cord for your vehicle to simplify even more.
Gwendolyn Y.
4/24/2026
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.
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.
The hardest part of the install was finding a place to mount the module box. With the location for the control knob in my Ram, I had to do some trimming and filing some of the plastic so the controller would make a flush fit.
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
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.
Giving this an excellent rating solely based on installation. I haven’t hooked the trailer to it yet but I don’t foresee any issues unless the unit itself, is faulty. Installed in a 2015 Ram 1500. It was prewired so it made it plug and play. Disconnected the negative on the battery, and pulled out the center console panel so I could access the place holder for the OEM trailer brakes. I wanted to put the Redarc knob on the place holder, which probably took more effort than if I had just drilled into the dash. I had to hollow out the back of the place holder and because there’s a slight bevel to it, I had to omit the bezel that would normally go under the knob. Aside from dinking around with that for too long, wire plug in and brake mount were a breeze. I ran the wires to the steering wheel side and used industrial strength Velcro with an adhesive backing to Velcro the box to the underside of the dash.
Very happy with the clean look in the console! Very easy to install after watching the accompanying video!
Do you have a question about this Trailer Brake Controller?
Info for this part was:
At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.
Brooke M.
5/1/2025
Woohoo! Glad this one is topping the charts! And just out of curiosity, what are some of the other brands you've tried?