bing tracking image
  1. Tow Bar Braking Systems
  2. Roadmaster
  3. Brake Systems
  4. Hydraulic Brakes
  5. Air Brakes
  6. Air Over Hydraulic Brakes
Roadmaster Even Brake Portable Supplemental Braking System - Proportional

Roadmaster Even Brake Portable Supplemental Braking System - Proportional

Item # RM-9400
lowest price pledge
Our Price: $1,595.00
You Save: $245.00
Tow Bar Braking Systems

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

This item qualifies for Free Shipping
Shipping Weight: 24 lbs
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

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.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
Product Expert Mike S

Is this right For you? Product Expert Mike S says:

Yes, if you:

  • Need to be able to switch between towed vehicles
  • Plan to drive through the mountains or hilly areas
  • Have a nice car and want to avoid premature wear and tear

No, if you:

  • Own a hybrid vehicle or a car with active power-assist brakes
  • Want a system that’s always ready and doesn’t require any setup at all
  • Are worried about tapping into your car's brake light switch during install
Portable, easy-to-adjust braking system uses an inertia sensor in the towed car to detect deceleration. Unit presses brake pedal in towed car to activate brakes with an intensity that matches deceleration. Breakaway and LCD monitor included. Lowest Prices for the best tow bar braking systems from Roadmaster. Roadmaster Even Brake Portable Supplemental Braking System - Proportional part number RM-9400 can be ordered online at or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (26)
  • Q & A (0)
  • Photos
  • Why etrailer?

Roadmaster Tow Bar Braking Systems - RM-9400

  • Brake Systems
  • Hydraulic Brakes
  • Air Brakes
  • Air Over Hydraulic Brakes
  • Proportional System
  • Portable System
  • Recurring Set-Up
  • Roadmaster
  • Not Power Assist Brake Compatible

Portable, easy-to-adjust braking system uses an inertia sensor in the towed car to detect deceleration. Unit presses brake pedal in towed car to activate brakes with an intensity that matches deceleration. Breakaway and LCD monitor included.


  • Supplemental braking system applies towed vehicle's brakes in proportion to braking action of RV
    • Towed car's brakes are activated at the same time and with the same intensity as those in your motor home
  • Inertia sensor detects deceleration and signals system to activate brake pedal with proportionate amount of pressure
  • Terrain-sensing design allows braking system to adjust for braking uphill, downhill or on uneven ground
    • Prevents false braking
  • Sensitivity adjustment on control panel lets you regulate how aggressively the system activates
    • Set sensitivity high so that unit responds to even minimal slowing of RV
    • Set sensitivity low so that unit activates only with intense stopping action from RV
    • Save settings in device memory to ease setup
  • Portable system is lightweight, fits most vehicles, and can easily be switched between vehicles
    • Adjustable pedal clamp fits over most brake pedals
    • Adjustable feet allow you to level the unit on uneven floors
    • Seat brace adjusts up and down for proper leverage
  • High-performance air compressor refills quickly to ensure that system is ready for the next stop
  • Monitor mounts in motor home to keep you updated on braking activity or changes in status or battery power
    • Provides LED, LCD, and auditory alerts
  • Breakaway system applies maximum brake pressure in the event of separation
  • System meets the braking requirements of both the US and Canada
  • Made in the USA


  • Dimensions: 12" tall x 11-1/4" wide x 16" long
  • Voltage: 12 volts DC
    • Requires 15 amps of power to function properly
  • Length of power cord: 42"
  • Max amperage draw: 10.8 amps
  • Idle amperage draw: 47 milliamps
  • Limited lifetime warranty

The Even Brake from Roadmaster is a portable, compact, self-contained supplemental braking system that sits in front of the driver's seat of your towed vehicle. It easily attaches to the brake pedal and applies the brakes with a force that matches the intensity with which your motor home slows when you brake it. Do-it-yourselfers will love the quick and easy installation. Hookup and disconnect can be done in just a few minutes. The Even Brake is a comprehensive system and it includes an emergency breakaway kit and a wireless brake monitoring system.

Even Brake Breakdown

Automatic Proportional Braking

A proportional braking system ensures that your towed car's brakes are applied with an intensity that matches the slowing or stopping action of your towing setup. The result is improved control, better stopping, and less wear on the brakes of both your vehicle and your RV. Even Brake also automatically levels itself when traveling uphill, downhill, or on uneven ground. This automatic adjustment keeps the Even Brake level on all terrain so that it continues to brake proportionally and efficiently. It also helps to prevent any false braking, which can occur when traversing rough terrain.

The Even Brake uses an inertia sensor to detect deceleration. Once the rate of deceleration is determined, an electromagnetic proportional regulator inside the unit will release the amount of air pressure needed to apply the towed car's brakes with an intensity that matches.

Installation and Easy Connection

The ICX transmitter box, which connects to your towed car's brake light switch, will permanently mount beneath your dash. This box plugs into the Even Brake portable unit and then transmits information regarding system status and braking activity to the receiver that mounts in your RV. It also connects to the included breakaway system so that it can signal the Easy Brake unit to activate the towed car's brakes in the event of a breakaway. Minor modification may be required to route the breakaway harness through your car's firewall.

Once the ICX transmitter is installed, setting up the Even Brake is a breeze. Just situate the portable unit in your towed car between the driver's seat and the brake pedal. Because the unit relies on being level to function properly, it has 4 independently adjustable feet to keep it stable in cars with uneven floors. The seat brace also adjusts up or down to ensure a perfect fit and proper leverage when pressed up against the driver's seat. Once you have the unit properly situated, position the brake pedal clamp over the brake pedal. Plug the portable unit into the ICX transmitter and then into the 12-volt accessory outlet in your towed car, which will power the unit. Before towing, make sure you press the test button on the Even Brake so that the system can cycle to deplete any vacuum pressure in the brakes.

Brake Sensitivity Settings

The Even Brake allows you to fine-tune the braking sensitivity to fit your personal preference. By adjusting the sensitivity on the operating unit, you get to decide how intense the change in forward momentum must be for the electromagnetic valve to respond. Set the sensitivity low and the Even Brake will only respond when you forcibly step on your RV's brake pedal. Set the sensitivity high and it will respond when you merely tap your RV's brakes. The Even Brake saves your personal settings, making setup faster and easier.

Monitor Alerts

Even Brake Breakdown

The included monitor mounts in your RV and keeps you updated on the status of the Even Brake. This wireless system relies on the ICX transmitter, which is mounted in the towed car, to send signals to the monitor. Just plug the monitor into a 12-volt outlet in your RV for power.

Because the ICX transmitter connects to your car's brake light switch, it is able to transmit a signal that lets you know not only when the Even Brake has been activated, but also if your towed car's brake pedal has actually been depressed. It's possible that the Even Brake could be misaligned, or it could shift or creep during travel, and may be unable to appropriately apply the brakes. Poor positioning could cause the unit to either apply the brakes continuously or to not apply enough pressure to the pedal to activate the brakes at all. This could happen with any portable system. But because the Even Brake informs you of the braking activity of your car rather just the activity of the braking system, you will be able to tell when there is a problem so that you can correct the issue before damage to your car's brakes occurs.

The Even Brake monitor uses different colored LED lights, an LCD text display, and audible alerts to keep you informed about your braking setup. The 3 LEDs - green, yellow, and red - give you an easy-to-see visual reference to keep you updated on how the Even Brake is functioning and what it is doing.

While the LED light offers a quick reference of what the Even Brake is doing, the LCD display explains it in detail. Whether the system is ready for towing, informing you that it is applying the brakes in the towed car, or warning you of an emergency braking situation, the text display keeps you in the loop.

The audible alert sounds in the event of an emergency. This way you'll know if, for example, a breakaway has occurred, even if you aren't watching the monitor.

9400 Road Master Even Brake Supplemental Braking System - Proportional

Installation Details RM-9400 Installation instructions

This Product Fits The Following Vehicles

Customer Reviews

Roadmaster Even Brake Portable Supplemental Braking System - Proportional - RM-9400

Average Customer Rating:  4.8 out of 5 stars   (26 Customer Reviews)

Portable, easy-to-adjust braking system uses an inertia sensor in the towed car to detect deceleration. Unit presses brake pedal in towed car to activate brakes with an intensity that matches deceleration. Breakaway and LCD monitor included.


I ordered a complete towing package from etrailer for my Sprinter RV to tow a Hyundai Accent. The Roadmaster Even Brake was the supplemental braking system that etrailer recommended. The system has worked flawlessly. After the original set-up, it literally takes all but 2 minutes to either put in or take out and stores neatly in the trunk of my Accent when not in use. The instructions for use and adjustment are clear and easy to understand. After a year of use, I couldn't be happier with this system.

Im happy to say that my towing package from etrailer is as reliable as they day we bought it and it has towed our little car around from coast to coast more times than I care to remember. At this point, I can hook up our car in my sleep! Thanks.
John K - 05/03/2021


Very easy to install with the supplied directions als o watched video of install on Haven’t used it yet but very pleased with toehold system.

2017 Toyota Tacoma

Very nice piece of equipment. Installation was no problem. The instructions are clear and easy to follow. It fits nicely in 2017 Tacoma. Initial drive showed a noticeable improvement in stopping smoothness without adjusting any of the settings from normal yet.


Installation instructions were complete and helpful. No problem one year later.

2015 Jeep Cherokee

Great product, but when ordering you need to request any updated supplemental technicians bulletins for your specific vehicle (my vehicle = 2015 Jeep Cherokee Trailhawk). Installation using the included product installation instructions exactly (not being told that there were updated technicians bulletins) caused the vehicle battery to run down to the point where I couldn't operate any vehicle electronics or start the vehicle. A call e-Trailer provided updated information. The manufacturer (Roadmaster) was aware of the issue and provided solution instructions. Had this been offered when ordered, I would have avoided having to deal with a dead battery and extra installation time. When installed using the updated information, the product works great.

2012 Fiat 500

Very good product
Easy to install and
to use
Very good service from etrailer

Very good
Jean-luc - 02/04/2020


The system is quickly installed and works extremely well. I had one emergency stop and it reduced the time to stop incredibly.


Will at e-trailer did a great job of answering very detailed Qs and helping with this order. Arrived quicker than expected. Very happy with the CS at e-trailer as well as this product,.

2012 Chevrolet Equinox

It is pretty easy to attach to the vehicle and remove once you get to your destination. It is pretty light so it doesn't take much to move it.


Great product, great delivery, great service. I wish the RV dealers had as much integrity as etrailer!


The unit is being installed Tue sday, january 21st. I checked the box, everything seems to be in order and was packed securely. At this point in time extremely happy with the service. The unit was delivered one day earlier than anticipated. Great job.


Wish I had brought it sooner

Good no complaints works well
Theodore - 01/19/2019


Easy to use and set up. I'm glad I choose this system. I haven't had any problems with RM-9400, great system


part came on time and in good shape


It works great and is real easy to inst all.



2021 Chevrolet Equinox





2020 Ford Ranger



Show More Reviews

Ask the Experts about this Roadmaster Tow Bar Braking Systems

  • Recommendations for Old Roadmaster Even Brake Supplemental Braking System that is Leaking Air
    It sounds like there is a small leak in your air compressor on your 2011 Roadmaster Even Brake. Unfortunately we don't have any internal replacement parts available for these supplemental braking systems. I recommend replacing it with a new unit # RM-9400. The easy part of that is that everything is connected and ready to just swap. You will also have some replacement parts if needed in the future. I have sent a separate email with the instructions for you as our link isn't currently...
    view full answer...
  • Is Roadmaster Even Brake Compatible with Vacuum Assist Vehicle Brakes
    The Even Brake Part # RM-9400 is compatible with vacuum assist brakes like what your vehicle has, it's not compatible basically with any other style though. The term listed may not be the best way to describe it so we apologize for that.
    view full answer...
  • Compatibility of Roadmaster Even Brake Portable Supplemental Braking System and 2012 Ford Taurus
    The Roadmaster Even Brake Portable Supplemental Braking System - Proportional # RM-9400 is a confirmed fit for your 2012 Ford Taurus unless your vehicle is equipped with active power assist braking system. Please check your owners manual to confirm why this is a compatibility issue. I checked with Roadmaster and they confirm a fit as well and do not recommend using a ratchet strap like you mentioned. I've attached the installation instructions to assist. Unfortunately we don't have a...
    view full answer...
  • What is the Key Position Needed for Flat Towing a 2012 Jeep Liberty Behind a Motor Home
    I checked the owners manual for a 2012 Jeep Liberty (starting on page 424) and it does seem to indicate that you would remove the key. I advise taking a look at the manual because only specific models can be flat towed and there is a specific procedure involved in doing so. The issue that I have is that if the key is removed then the steering would lock and the wheels would scrub on turns.
    view full answer...
  • Even Brake Test Pumps Brake Pedal Twice then Fails
    I spoke with my contact over at Roadmaster and have some things that you can check. When the Even Brake # RM-9400 pushes on the brake pedal 3 times what it is doing is making sure that it is receiving a brake signal from the cold side of the brake switch. If it does not detect the signal then it does exactly what you have described. The brake signal it is looking for goes through terminal 1 on the Even Brake. On a 2007 Jeep Liberty you should be tapped into a white/tan wire on the brake...
    view full answer...
  • Roadmaster Even Brake Portable Braking System Compatibility With Air Brakes On Motorhome
    The Roadmaster Even Brake Portable Supplemental Braking System - Proportional # RM-9400 will work with a motorhome that uses air brakes. The signal from your brake lights will still produce the signal needed and the Even Brake uses that internal inertia sensor for deceleration, so it will work just fine.
    view full answer...
  • Does a Breakaway System Need to Have the Breakaway Switch to Properly Function
    Your Brake Buddy, like the Roadmaster Even Brake # RM-9400, needs to have a breakaway switch to properly function. Without a breakaway switch the vehicle that is being towed could cause much more damaged as the brakes would not be activated if the vehicle being towed were to be disconnected. Nobody ever expects that something will happen to them, but it is always best to go with more safety and ensure that it is all setup correctly.
    view full answer...
  • Is Roadmaster Even Brake Portable Braking System Compatible with 2013 Fiat 500
    If you have the 2013 Fiat 500, the adjustable pedal clamp included with the Roadmaster Even Brake Portable Supplemental Braking System # RM-9400 is compatible with and will fit the brake pedal in the vehicle. The 2014-2016 Fiat 500L is equipped with a brake pedal that is not compatible with this type of braking system, but there should not be an issue with your 2013 Fiat 500. There is not a special pedal bracket available for this system. This is a very nice braking system that will activate...
    view full answer...
  • Can a Flat Towing Setup Ever Be Reversed
    You may realize this now, but you should never try to reverse a flat towing setup. Even short distances can be disastrous. If all that happened was that your Jeep tires ended up scrubbing across the pavement then you got lucky and there was no damage. But I would recommend you disconnect everything and go over everything to see if you can find any bends or other damage. Specifically look at the tow bar arms to make sure they are totally straight. If the arms are telescoping make sure they...
    view full answer...
  • Will Roadmaster EvenBrake part # RM-9400 Fit a 2004 Saturn Vue
    Yes, the Roadmaster EvenBrake part # RM-9400 is compatible with your 2004 Saturn Vue. The universal nature of this system basically allows it to fit any vehicle.
    view full answer...
  • Troubleshooting Roadmaster Even Brake that Shows Brakes on Car are Engaged for Saturn Vue
    I spoke with my contact at Roadmaster and he told me that the Saturn Vues (specifically the 2008-2010 models) are known for the problem you described. He said the issue is that the stoplight switch on your brake pedal assembly is sticky and what you need to do is spray some silicone lubricant on the moving parts of the assembly to ensure that the switch doesn't get stuck.
    view full answer...
  • Installation of Roadmaster Brake-Lite Relay on 2003 Chevy Tracker 4x4
    You will pull the fuse for your parking lights labeled STP from the instrument panel fuse box. I've attached the photo of this as well as the flat towing instructions to assist from your owners manual.
    view full answer...
    Image 1 for Image 2 for
  • Hard to Access Brake Switch to Install Even Brake on a 1999 Honda CR-V
    You don't necessarily have to remove anything else if you are able to see the wiring on the brake switch on your 1999 Honda CR-V. If you can see the wiring then look for the green wire with a white stripe and that is the wire you will need. If you are able to follow that wire it might lead to a place that is easier for you to reach. If there is a dash panel at the lower part of the dash below the steering column you might be able to remove that for better access like on the 2011 model,...
    view full answer...
  • Does Even Brake Proportional Flat Tow Braking System Need to Sense Deceleration to Apply
    The Even Brake part # RM-9400 that you referenced is a proportional system that needs to sense vehicle deceleration to activate the brakes of the towed vehicle. This means that if you aren't moving it's not going to apply the towed vehicle brakes. I'd recommend attempting to brake again but this time with the setup moving and you shoudl see the towed vehicle brakes apply.
    view full answer...
  • Roadmaster Even Brake Portable Proportional Braking System Displays Red LED Light Only
    There are a couple thing you can do to get your system up and running. Per the instructions you need to plug the Even Brake unit into the transmitter in the towed vehicle before plugging in the monitor in the towing vehicle. The Even Brake 12-volt power cord is always last in and first out. Never plug in the power cord until Even Brake is completely installed. You then plug in the monitor in the motorhome. The LCD should display "Even Brake ready to test", with a yellow LED illuminated....
    view full answer...
  • Installation Steps for Roadmaster Even Brake # RM-9400 in 2015 Jeep Cherokee Limited
    Our installers recently had a chance to install the Roadmaster Even Brake # RM-9400 Proportional Braking System in a 2014 Jeep Cherokee and we created a complete install video showing the process from start to finish. A link to that video is included for you. The basic install steps include: 1) mounting the breakaway switch on the bottom of the front bumper; 2) mounting the ICX transmitter box under the dash; 3) routing the breakaway cable through the grommet in the car's firewall; 4)...
    view full answer...
  • Even Brake Arm Does Not Move During Testing Procedure
    As far as the transmitter and the in-cab monitor the issue is likely the location of the ICX transmitter. Try moving it to a higher location or in a location with less obstructions. This could also be the cause of the unit not functioning properly during the testing phase of the installation. If the system is running but the pressure is not building then that would be an internal problem and the unit will need to be serviced or replaced by Roadmaster.
    view full answer...
  • Roadmaster Even Brake Braking System Will Not Complete Test Sequence On 2012 Ford F-150
    It sounds like there may some wiring that is not working for your brake system. I called my contact at Roadmaster and they told me there are three things the system is looking for when running through the test. First it is looking for 12V power form the socket the unit is plugged into. it is also looking for 12V power from the transmitter. Next, it is checking for frequency from the motorhome. Last, the stop light switch needs to be wired correctly. On your F-150 the unit needs to...
    view full answer...
  • Where Would ICX Transmitter of Roadmaster Even Brake Mount on 2017 Jeep Wrangler Unlimited
    The ICX transmitter of the Roadmaster Even Brake System part # RM-9400 is designed to mount under the dash of your 2017 Jeep Wrangler Unlimited. I wish we had an install video that showed this installed on a similar Jeep as yours but the best we have is for a Jeep Grand Cherokee which I attached below.
    view full answer...
  • Can Frequency Be Changed For Roadmaster Even Brake Supplemental Brake System
    There is a way to change the frequency of the Even Brake system, part # RM-9400. There are actually 4 frequencies that can be set. My contact at Roadmaster said your system is probably set at ICX 1, so you can change the setting to a different setting. This is listed in the Programming Instructions which should have been included with your system.
    view full answer...
  • Is Intermittent Running Of Compressor On Roadmaster Even Brake System After Testing A Problem
    After testing the Roadmaster Even Brake # RM-9400 when you set it up, the system is designed to top off the air canister periodically. I called my contact at Roadmaster and they told me the compressor will kick on usually every ten to fifteen minutes to top off the system. If the brakes are working properly when using the system, then the Even Brake is working as designed.
    view full answer...
  • Even Brake Portable Proportional Braking System on 1993 Honda Civic Hatchback
    Yes the 1993 Honda civic has power brakes. If a car does not have power brakes the brake pedal acts the same when the car is running or not. On a car with power brakes, the pedal is much, much harder to push when the vehicle is not running. This system does not require the car to be running so the Even Brake must apply a greater amount of pressure to the pedal and that pressure would be too much for a car without power brakes. This is an excellent system for safety and conservation...
    view full answer...
  • Necessity of Installing Battery Disconnect to Flat Tow 2010 Jeep Wrangler
    From what I have found in my research, to flat tow the vehicle the ignition key must be turned to the first or accessory position. Even with all accessories in the vehicle switched off, this creates sufficient draw on the battery to discharge the battery gradually while towing. After around 5 hours, the battery will not have enough charge to start the vehicle. I have read that removing the Ignition Off Draw or IOD fuse from the fuse box under the hood will prevent this from happening....
    view full answer...
  • When Is the Battery Used On The Roadmaster Even Brake Braking System # RM-9400
    On the Roadmaster Even Brake Portable Proportional Braking System, part # RM-9400, the battery will have a minimal drain on the battery at all times because it uses a constant self-diagnostic test on the system at all times and transmits the testing info to the wireless monitor. The monitor will show you that the Even Brake system is fully operational. The drain on the battery would be very minimal when it is doing the self-diagnostic testing. It also has a Power Save low battery protection...
    view full answer...

< Previous
123. . .45

Do you have a question about this Tow Bar Braking System?

  • Why

    At we guarantee:
  • Highest quality tow bar braking systems for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate tow bar braking system information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Joe V
Test Fit:
Joe V
Employee Nicholas E
Test Fit:
Nicholas E
Employee Brent H
Test Fit:
Brent H
Employee Shane H
Test Fit:
Shane H
Employee Robert C
Test Fit:
Robert C
Employee David F
Test Fit:
David F
Employee Mike L
Expert Research:
Mike L
Employee Robert G
Expert Research:
Robert G
Employee Patrick B
Expert Research:
Patrick B
Employee Michael H
Expert Research:
Michael H
Employee Jeff D
Expert Research:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Adam R
Expert Research:
Adam R
Employee Rachael H
Expert Research:
Rachael H
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Lindsey S
Updated by:
Lindsey S
Employee Adele M
Updated by:
Adele M
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Amanda M
Updated by:
Amanda M
Employee Hannah L
Updated by:
Hannah L
Employee Mike S
Updated by:
Mike S
Employee Isabelle B
Updated by:
Isabelle B
Employee Jacob T
Video Edited:
Jacob T
Employee Andrew L
Video Edited:
Andrew L
Employee Kathleen M
Video Edited:
Kathleen M
Employee Dustin K
Video Edited:
Dustin K
Employee Sue W
Video Edited:
Sue W
Employee Chris R
Video Edited:
Chris R
Employee Alan C
Video by:
Alan C
Employee Zach D
Video by:
Zach D
Employee Michael B
Video by:
Michael B

At 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.