1. Tow Bar Braking Systems
  2. Roadmaster
  3. Brake Systems
  4. Proportional System
  5. Air Brakes
  6. Air Over Hydraulic Brakes
Roadmaster BrakeMaster System w BrakeAway for RVs w Air or Air Over Hydraulic Brakes - Proportional

Roadmaster BrakeMaster System w BrakeAway for RVs w Air or Air Over Hydraulic Brakes - Proportional

Item # RM-9160
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Tow Bar Braking Systems

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Roadmaster Proportional System Tow Bar Braking Systems - RM-9160
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Product Expert Mike S

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

Yes, if you:

  • Own a motorhome with air brakes or air-over-hydraulic brakes
  • Tow a nicer or newer car and want the most precise braking possible

No, if you:

  • Want a system that doesn't require any setup so you can hit the road faster
  • Have limited space in your RV for a bulky air compressor
  • Intend to install yourself, but don’t have an advanced mechanical background
Truly proportional braking system with breakaway connects directly to your motor home's air brakes and applies the brakes in your towed car using the same force that you apply to the brakes in your RV. Lightweight actuator removes for storage. Lowest Prices for the best tow bar braking systems from Roadmaster. Roadmaster BrakeMaster System w BrakeAway for RVs w Air or Air Over Hydraulic Brakes - Proportional part number RM-9160 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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  • Reviews (53)
  • Q & A (127)
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  • Why etrailer?

Roadmaster Tow Bar Braking Systems - RM-9160

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

Truly proportional braking system with breakaway connects directly to your motor home's air brakes and applies the brakes in your towed car using the same force that you apply to the brakes in your RV. Lightweight actuator removes for storage.


  • 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
  • Truly proportional system uses the air pressure from your RV's brakes to apply the brake pedal in your car
    • Connects to RV's air or air-over-hydraulic brakes to sense when and how those brakes are applied
    • Ensures synchronized, reliable braking
  • No false braking
    • Coach air brakes must be activated for system to apply towed car's brakes
  • LED display mounts in motor home to alert you when the towed vehicle's brakes are applied
    • Connects to towed car's brake light switch to ensure proper reading
  • Compact, lightweight actuator is easy to connect, disconnect, and store
    • Custom seat bracket (sold separately) is required to complete installation
    • Universal floor plate (450650-01 - sold separately) can be used if a custom option is not available
  • BrakeAway device brings towed car to a controlled stop in the event of separation
  • System meets the braking requirements of both the US and Canada
  • Made in the USA


  • Application: motor homes with air brakes or air-over-hydraulic brakes
  • Cylinder length: approximately 2'
  • Limited lifetime warranty

Automatic, Truly Proportional Braking

BrakeMaster offers truly proportional, synchronized braking by connecting directly to your RV's air or air-over-hydraulic brakes. The air cylinder that attaches to your towed vehicle's brake pedal will apply your car's brakes at the same time and with the same intensity as you apply the brakes in the RV. To achieve this proportional braking, the BrakeMaster uses air pressure from your coach's brakes to depress the brake pedal in your towed car. The result is uniform, real-time braking that mirrors the slowing or stopping action of your coach.

Many other proportional systems activate the towed car's brakes based solely on inertia. With this kind of setup, any activity that affects the forward momentum of your towed car - from the coach actually braking, to driving over a pothole - can activate the supplemental braking system and apply your towed car's brakes. This potential for false braking, which can occur simply from driving over uneven terrain, can create a rough ride for you in the RV and can also wear out your towed car's brakes over time. The BrakeMaster is different, though. Because it is tied into your coach's brakes and is not dependent on inertia, this system activates only when you apply the brakes in your RV, so there is no false braking.

This braking system will work with almost any RV that has air or air-over-hydraulic brakes. It will also fit nearly any car, although a seat adapter may be required for installation in certain vehicles.

Installation and Easy Connection

The BrakeMaster connects directly to your RV's air or air-over-hydraulic brakes, making the installation on the RV side quite involved. An advanced mechanical background is required. Once you have successfully tapped into the RV's brakes, use the included hose to connect your RV brake line to BrakeMaster's actuating cylinder. A custom seat adapter (sold separately) is required to secure the cylinder to the floor in your towed car. If a custom bracket is not available for your application, then a universal floor plate (450650-01 - sold separately) can be used instead. The clamp on the opposite end of the cylinder attaches to your car's brake pedal. When you apply the brakes in your RV, air will travel from the RV to the cylinder. The cylinder will then transfer that air pressure to the actuating arm, which will apply the brake pedal in the towed car.

Once the BrakeMaster is completely installed, connecting and disconnecting is quick, easy, and requires no tools or adjustments. To disconnect the system, just remove the clamp from the brake pedal, unclip the cylinder from the mounting bracket, and disconnect the air hose. To connect again later, simply attach the clamp to the pedal, secure the cylinder to the bracket on your floor or seat adapter, and reconnect to the air hose.

Breakaway Device


In the unlikely event that your vehicle separates from your motor home, the included breakaway system will give you peace of mind. Just mount the breakaway switch at the front of your towed car and wire it to both your battery and to the BrakeAway air reservoir. The air reservoir connects to the actuator that presses the brake pedal in your towed car. If your towed car separates from your motor home, the pin in the breakaway switch will be pulled out, which will send a signal to the BrakeAway to activate. The BrakeMaster actuator will then be signaled to press your towed car's brake pedal, bringing your vehicle to a stop.

Monitor Alerts

Most supplemental braking systems have methods of letting you know you when the system is activated, but they don't necessarily inform you of whether or not the brake pedal is being depressed. Such setups leave opportunities for false notification, which can be dangerous and potentially damaging. If the system activates but doesn't depress your car's brake pedal, then your RV's brakes will be taxed because they will have to brake for the towed car as well. On the other hand, if the system isn't properly positioned, it could be pressing your car's brake pedal continuously, which could damage your vehicle. BrakeMaster's system is different. The included LED monitor connects to your towed car's brake light switch. When your car's brake light goes on or off, so does the notification light. This way you'll always know whether or not your car's brake pedal is being pressed.

9160 Road Master Brake Master Supplemental Braking System with Breakaway - Air and Air Over Hydraulic Brakes

Installation Details RM-9160 Installation instructions

This Product Fits The Following Vehicles

Customer Reviews

Roadmaster BrakeMaster System w BrakeAway for RVs w Air or Air Over Hydraulic Brakes - Proportional - RM-9160

Average Customer Rating:  4.7 out of 5 stars   (53 Customer Reviews)

Truly proportional braking system with breakaway connects directly to your motor home's air brakes and applies the brakes in your towed car using the same force that you apply to the brakes in your RV. Lightweight actuator removes for storage.

- RM-9160
2018 Ford Explorer

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!

- RM-9160

Works nice behind our wanderlodge.

- RM-9160
2008 Honda Pilot

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

- RM-9160

This application works perfectly for my jeep

- RM-9160
2018 Jeep JL Wrangler Unlimited

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.

- RM-9160

Looks to be very complete and should work as intended. As of yet, have not installed and cannot comment as to whether it actually will work. Have confidence in the Roadmaster name and their products. Am not expecting any issues. (Just received yesterday, 01/28/21).

- RM-9160

Works as intended. No issues or compla ints:)

- RM-9160

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.

- RM-9160

have not yet decided where i will mount this

- RM-9160

Fairly easy to install and worked great when brakes are applied from MH.

- RM-9160
1997 Jeep Wrangler

We read and went with the instructions and it went just like it was supposed to. The pictures make it so much easier. Just want to Thank You All for making it go together like it should. Thank You All.

It is working great, went together like it was supposed to. Thank You all for everything.
Georgia - 09/04/2019

- RM-9160

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.

- RM-9160

Took my time the install was very easy, also the [installation] video was most helpful.

- RM-9160

Product as described. Works well. Service is the greatest. I have never been disappointed. Highly recommended etrailer for all your needs.

- RM-9160
2003 Jeep TJ

Easy to install with some mechanical background and tools. Quick delivery. Best internet price.

- RM-9160
2010 Jeep Wrangler

Easy to install and works fantastic

- RM-9160
2018 Chevrolet Silverado 1500

Love the products, more important, etrailer had the best customer service I've ever had from an online store!!! Thanks Vanessa!!!

- RM-9160

after a trouble free year of service, i can say that i love the ease of hookup and trouble. i would recomend this product to my friends and anyone who needs the product,

- RM-9160

Love this set up, easy to attach to my Raptor. Works like it should. High Quality materials

- RM-9160

etrailer provided excellent customer service and I received by products in six days. Thanks trailer.

- RM-9160
2017 Jeep Wrangler

Excellent packaging and informative videos available for installation. Made it easy and I saved $$$$ for professional installation doing it myself.

- RM-9160
2013 Chevrolet Silverado

It.came SUPER FAST!! Very Impressed!

- RM-9160

Nice items at very fair prices. Fast sh ipping

- RM-9160

Excellent Product Information. Prompt Delivery....

- RM-9160

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Ask the Experts about this Roadmaster Tow Bar Braking Systems

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

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Info for this part was:

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