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When you hit the brakes, you want your towed vehicle to follow along naturally. The Roadmaster BrakeMaster uses the air pressure from your RV’s brake line to apply the towed car’s brakes at the same time and with the same intensity. That means your brakes respond together—no delay, no jerky stops, and no false activations on bumps. It’s a true proportional system that feels smooth and predictable every time, giving you the same confident braking you have when driving solo.
Because the BrakeMaster ties directly into your RV’s air or air-over-hydraulic brakes, there’s no inertia sensor guessing when to stop. The actuator responds only when you actually press the pedal on the motorhome, ensuring accurate braking without over-reacting to rough terrain. The result is reliable performance that protects your brakes from unnecessary wear.
This system combines the clean look of a permanent install with the convenience of a quick-release actuator. Most components stay installed out of sight, while the lightweight actuating cylinder attaches to your brake pedal and seat for each trip. It braces securely in place, then disconnects and stores easily when you’re done. Once installed, getting ready to tow takes just a few minutes—pin the pedal clamp, connect the air line, and you’re set.
If a tow bar failure or hitch disconnect ever happens, the integrated BrakeAway system steps in instantly. A reservoir under the hood stores pressurized air and powers the actuator to apply the brakes, bringing the towed vehicle to a safe stop. It’s a fail-safe design that meets U.S. and Canadian braking requirements and gives you peace of mind every time you hit the road.
The BrakeMaster includes an LED indicator light that mounts on your RV’s dashboard. It connects directly to the towed vehicle’s brake light switch, so it only lights when the brakes are actually applied—not just when the system activates. You’ll always know your setup is working properly and that your towed vehicle is braking right when it should.
Flat towing can be a much more convenient way to take your car RVing with you than using a trailer or a tow dolly. It'll save you storage space both at home and at the campsite, and it takes less time and hassle to hook up.
To flat tow your vehicle, there are 5 basic components you're going to need: a tow bar, a base plate kit, a safety cable set, tow bar wiring, and a flat tow braking system.
| For the RV | Between the RV and Towed Car | For the Towed Car |
|---|---|---|
| Hitch | Tow bar | Base plate |
| Wiring plug | Safety cables | Braking system |
| Wiring adapter cord | Wiring kit/diodes |
The custom-fit base plate installs on the frame of your toad so you can connect the car to your RV with a tow bar. Hook up safety cables between the vehicles to ensure that the toad does not separate from the motorhome if the tow bar becomes detached. Tow bar wiring syncs your vehicle's signal lights with your motorhome's tail lights, as required by law in most states. Finally, the flat tow braking system - also required in most states - activates the brakes in the toad when you hit the brakes in the RV, making for smoother, safer braking, and preventing wear on your motorhome.
Alternate Instructions
Customer Satisfaction Score:
95% were satisfied with this product
5% of customers were not satisfied
Ratings & Reviews
Works great EZ install, dont forget the seat adapter bracket
I used this on a 1988 Toyota Land Cruiser, so I could flat tow it behind an Motorhome. Easy to install! This works awesome.
there should be brackets on the side also to keep if from sliding side to side,, even if you have it straight,, just for additional safety, just a thought I use zip ties.
works very good, did not come with indicater light or wire that tells you in the cab that the breaks have been activated
Fairly easy to install and worked great when brakes are applied from MH.
Easy to install, works great! Highly recommend for air brake systems, quick to hook up and take out.
Love the small unit in my mini cooper. The air brakes are true proportional when braking. It is easy to set up and break down.
Second set on second Jeep, Brake system works great, a bit of an install with the air lines and placement of the small tank in the crowded engine compartment BUT once it is in the setting of the brake peddle arm is easy!
Well built brake system. Installation is better done by a mechanic. It took about 3 hours. In my opinion, an air system is the only way to go. Set up when you get ready to tow takes about 1 minute. Just pin the brake pedal clamp, pin the base of the cylinder and plug in the air line and you are ready.
Installation does take some time as you will have to find a good place to install the break away cylinder. I could not find any reference material for my application. 2018 Jeep Wrangler JL with the 2.0 liter engine. The only place I could find to install it was between the battery and the fender. If you are not mechanically inclined I would recommend having this installed by a professional.
Got everything installed except the foot that mounts to the floor. It wasn't in the box. I called etrailer who contacted Roadmaster and they said they would ship and I should have in a couple of days. Installed everything else along with the tow bar and light kit. Followed all the instructions and all went smoothly with no issues. Just have to wait for the missing part to complete and test.
Hardest part was finding a place for the air reservoir, which I placed in front of the driver's side wheel, inside the fender liner of our 2018 Explorer. Can still reach the drain valve, worked great. Etrailer is awesome to work with!
The product shipped on time and has been worry free. etrailer gets 5 stars for customer service every time I order from them.
This braking system does what it's suppose to do, smooth proportional braking between motorhome air brakes and the tow vehicle. The only reason I did not rate at 5 stars is that there is a slight misalignment of air cylinder mounting bracket and 2022 Jeep Gladiator brake pedal.
This kit was installed on a 2007 Jeep Patriot. It did require fabrication of a seat mount bracket. Fairly easy with some angle iron and some spacers. Install was fairly straightforward. It required mounting the surge tank inside the engine bay and running wiring to and from the battery and breakaway switch. It also required mounting the quick release air fittings at the bumper, inside the vehicle, and also at the rear of the RV. I also mounted the LED indicator inside the RV and utilized the existing towing harness to run power from the vehicle to the front of the RV.
I love this whole kit accept for a couple things that I'm working through now. I have a 2018 F150 and a 2020 Nexus Ghost super C. On the F150, I purchased the seat bracket. When I put he hydraulic cylinder on, the hose was too short. It had a permanent pre-made hose. I have enough line to make a new hose, but had to go the the hardware store and buy new compression fittings to make the new line. No big deal, but annoying. Also on the NeXUS brand diesel pusher, I called Roadmaster to get clarification on where exactly to bust into the brake line and clear up the warranty question. They were very polite and helpful. They told me exactly how to determine the "metered" line. I've yet to finish that part of the install. But they indicated it would not affect my warranty with International nor would it cause any unsafe situation should my vehicle come loose from the MH and have to use the emergency stop feature built into the Brakemaster system. Both my MH and my tow vehicle is protected. I think that they could do a much better job explaining the MH side of things. All in all-it seems it will be a great system.
Great supplemental braking system. We are the second owners of our class-A motorhome. The original owners had installed a Brakemaster system; so we figured to use the same type of equipment as well - and we're glad we did. Having a proportional air over hydraulic braking system seems to provide a more accurate braking experience for our 2018 Ford Fiesta. Each time I apply brakes on the motorhome, a red LED light on the dash illuminates to tell me that the brakes are being applied on the tow vehicle as well.
Roadmaster was real slow with the delivery of the seat adapter. But Michael kept me informed all the way through to the delivery. etrailer is 5 stars all the way from start to finish. I look forward to using them in my orders to follow.
Now for ROADMASTER products
RM-643 safety cables quality is good work fine Delivery was fast
RM-9160 brake master system Love this system instructions were easy to follow
RM-15267 toad tail light/brake wiring good instructions for install
RM-1550-1 base plate good instructions for install except you need to drill two 1/2'' holes you must measure and mark as there is no pilot hole.
The whole system works great with the 2008 Honda Pilot
RM-88189 seat adapter I have yet to install as I had to make up my own for the trip.
I will say the seat adapter bracket is made just for the Honda and Acura, they had to make custom make. Thanks to all the car towed great for my first trip of 1,100 miles
For me it is the perfect towed braking system! Simple operating principle, easy installation, quick set-up and detach. Never needed for breakaway, but pre-trip test is always perfect functioning. Definitely saves on coach braking force needed.
(Installed on 2015 Itasca 34T DP w/2007 Toyota Tacoma)
Allan
10/30/2022
Many thousands of miles, across deserts and over mountains, without a single issue or problem! Definitely recommend this system to any RV’er with coach air brakes.
This system works like advertised. I feel it is a very reliable system. I had a friend install it and it sounded like it went pretty well.
Make sure you order the plate needed for your vehicle. Had to wait a week until that came in to complete the installation. Plus if you are placing in a Ford Edge, there is a firewall access behind the battery. Knowing this makes it easier to do. Also on the Edge you have to make a small extension to get the connectors easier to disconnect.
The install on my Ford Maverick is clean and functional, so this is more of a customer service review... excellent customer service!
During the 4-day towing set-up install, the forecast was for freezing temps and my rig was not winterized. I called in mid panic and the motorhome was moved indoors.
A few months after using the tow set-up, a minor problem developed. I called and the CSR apologized and said, I can see how that might be frustrating, and a replacement cable (slightly longer) was sent free of charge.
EZY pezy mounted air reserve cylinder right behind the right side of the rad will fit in easy and accessible
Works great, my motorhome was already set up to pull a toad with and air line already run to the rear bumper and the indicator light already in the motorhome dash so installation in the toad was the easy part.
The system works great! I was too intimidated by my coach's air brake system to attempt to install the line on the coach, so I had that done by a pro. But I did the rest of the install myself. It was straightforward, and the installation instructions were crystal clear. The product works great.
John
5/3/2026
Working well.
James D.
5/4/2026
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Dave
5/23/2024
The product has worked perfectly.