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Roadmaster 9700 Portable Supplemental Braking System - Preset

Roadmaster 9700 Portable Supplemental Braking System - Preset

Item # RM-9700
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Tow Bar Braking Systems

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In Use/Installed

The Roadmaster 9700 uses a preset amount of pressure to apply the brake pedal in your towed car when you brake your RV. The system ties into your tow bar wiring to receive the brake light signal from your RV. Portable for easy removal and storage. Lowest Prices for the best tow bar braking systems from Roadmaster. Roadmaster 9700 Portable Supplemental Braking System - Preset part number RM-9700 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (7)
  • Q & A (85)
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Roadmaster Tow Bar Braking Systems - RM-9700

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

The Roadmaster 9700 uses a preset amount of pressure to apply the brake pedal in your towed car when you brake your RV. The system ties into your tow bar wiring to receive the brake light signal from your RV. Portable for easy removal and storage.


  • Supplemental braking system activates brakes on towed vehicle when you engage the brakes in your RV
    • Applies brakes using a preset pressure - light, medium, heavy, or emergency braking
  • No false braking
    • System ties into tow bar wiring to ensure activation only when RV brake lights come on
  • High-performance air compressor refills quickly to ensure that system is ready for the next stop
  • 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
  • Monitor mounts in motor home to keep you updated on braking activity
    • LED display alerts you when the towed vehicle's brake pedal is being depressed
    • Audible alert informs you of an extended braking period
  • Braking system meets the braking requirements of both the US and Canada
  • Breakaway system applies maximum brake pressure in the event of separation
  • Made in the USA


  • Dimensions: 12-1/4" tall x 13-1/2" wide x 16" long
  • Voltage: 12 volts DC
  • Length of power cord: 54"
  • Max amperage draw: 10.8 amps
  • Idle amperage draw: 64 milliamps
  • Limited lifetime warranty

The 9700 from Roadmaster is a portable braking system that sits in front of the driver's seat of your towed vehicle. It easily attaches to the brake pedal and taps into your tow bar wiring to determine when you RV's brakes are applied. A preset amount of pressure (light, medium, or heavy) is chosen during setup. Then, each time you brake in the RV, the brake pedal in your towed car will be applied with that preset intensity. The 9700 can also be adjusted to only brake in an emergency breakaway situation. Hookup and disconnect can be done in a minute or two. The 9700 is comprehensive and includes an emergency breakaway kit and an LED and auditory monitoring system.

Preset Braking

The 9700 is designed to activate the brakes in your towed car upon receiving a signal from your RV that the motor home's brakes have been applied. There are 3 different pressure settings - light, medium, and heavy braking - to fit your preferences. You can also set the 9700 to activate in an emergency breakaway situation only. With the 9700 you get real-time braking action, ensuring that your towed car brakes at the same time and for the same duration as the brakes in your RV are applied. In addition, because this system only activates when you apply the brakes in your RV, there will be no false braking when you hit bumps or pot holes.


The 9700 unit is powered by the 12-volt accessory outlet in your towed car. To get the required braking signal, the brake light wire on the unit connects to your towed car's tow bar wiring. Anytime the braking signal is received from your RV by the tow bar wiring, the 9700 is triggered to respond. As a result, when you apply the brakes in your RV and your brake lights illuminate, this signals the 9700 to apply the brakes in the towed car.

Connecting and disconnecting the 9700 unit is a breeze. Situate the 9700 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 in the power cord. Before towing, make sure you release any air from the reservoir using the air relief button and then press the test button so that the system can cycle to deplete any vacuum pressure in the brakes.

Visual and Audible Alerts

The visual and audible alerts provided by the 9700 keep you updated on the status of your towed car's braking. Using the LED light and audible alerts, you will be in the loop.

The LED light illuminates whenever the brake pedal in your towed car is applied. This visual reference lets you know if the braking system is functioning properly. If the light is on but you are not braking, or if you are braking but the light does not come on, then there may be an issue with the braking system.

The audible alert informs you of extended braking. This is important because extended braking can damage your vehicle's brakes. To help prevent damage, the 9700 will release pressure and stop applying the brakes in your car. If you were braking during that period of time, you will need to let off the brake and reapply in order to get the 9700 to reactivate. If you were not braking during that period of time, then a system malfunction is likely and it will require immediate attention.

9700 Road Master 9700 Portable Braking System

Installation Details RM-9700 Installation instructions

This Product Fits The Following Vehicles

Customer Reviews

Roadmaster 9700 Portable Supplemental Braking System - Preset - RM-9700

Average Customer Rating:  4.4 out of 5 stars   (7 Customer Reviews)

The Roadmaster 9700 uses a preset amount of pressure to apply the brake pedal in your towed car when you brake your RV. The system ties into your tow bar wiring to receive the brake light signal from your RV. Portable for easy removal and storage.

- RM-9700

Only used it last year and it worked great. Not sure we are traveling this winter. 571131

- RM-9700

Excellent service. Excellent price. Very user friendly web site 707436

- RM-9700
Ford Ranger

Ordered my Towbar and received it in just 4 days. Product looks well built and was easily installed. I’m using this kit to move my Ford Ranger across country. Towbar goes on and removes quick and easily. etrailer was professional and understanding of my needs. Their staff was very courtious and have very good knowledge of their product. I Purchased the complete kit, including brake kit. I have not yet towed yet but I’m hooked up and all is working and ready to go. Will up date my experience and take some pics after my trip. 707551

- RM-9700

This is exactly what I was looking for to get my car ready for towing. It’s a small car so size was a concern and I was glad to see I could opt out of using this as an auxiliary braking system and just use it as a brake away device only. 861501

- RM-9700
by: 08/13/2020

works but tight space in my little car 861393

- RM-9700
2018 Jeep Cherokee

looks great haven't tried it yet will let you know 728170

- RM-9700

This braking system has performed as advertised. Service staff have be great 705378


Ask the Experts about this Roadmaster Tow Bar Braking Systems

  • Installing Roadmaster 9700 Portable Braking System on 2014 Chevy Equinox
    Thank you for your recent purchases! The Roadmaster 9700 Portable Braking System # RM-9700 that you referenced will work great on your 2014 Chevy Equinox. With this system on your vehicle you will need to add the Stop Light Switch Kit # RM-751439, which allows the RV monitoring system on the Roadmaster 9700 work properly, and the 12V Outlet Kit # RM-9332 to provide power to the unit. I have attached a couple installation videos for each of these parts on your Chevy Equinox that you can...
    view full answer...
  • Is Diode Needed When Installing Roadmaster # RM-9700 Supplemental Braking System
    I attached a picture that shows where the diode of the Roadmaster Braking System part # RM-9700 installs to the vehicle it's installed in. You will still want to use the diode with your Hopkins wiring kit # HM56200.
    view full answer...
  • Is the Roadmaster 9700 System # RM-9700 Recommended for a 2015 Jeep Wrangler
    The Roadmaster 9700 Portable Supplemental Braking System # RM-9700 is a very good Supplemental Braking System option that will serve you well while flat towing your 2015 Jeep Wrangler. The main reason that some people choose to not use a portable towing system like the 9700 is because they do not want to store it or have to install it every time they get ready to flat tow. For people that have this viewpoint (and if you would rather not have to do that) we recommend a permanent install...
    view full answer...
  • GM Update for Fuse Pulling in 2010-2017 Chevy Equinox and GMC Terrains Flat Towing
    I found the update that GM put out for the 2010-2017 Chevy Equinox and 2010-2017 GMC Terrains with a 4 cylinder engine that covers the fuses that need to be pulled when flat towing. Now you only have to pull the 16 fuse. It used to be that you need to pull the 32 fuse too but that was causing steering system wobble when flat towing so it's now just 16. In 2018 The Equinox does not need to have any fuses pulled and the 2018 Terrain is not flat-towable.
    view full answer...
  • How to Determine if a 2018 Chevrolet Equinox Can Be Flat Towed
    The flat towing of any vehicle is always subject to the guidance of the auto maker that built it. Certain versions of some cars cannot be flat towed and the owner's manual will state as much. Other vehicles may be flat-towable only when they have certain specific equipment installed. While you will find lots of helpful folks providing their experiences on forums and online groups the one authority for what should be done with the vehicle itself to flat tow it is that auto maker. The...
    view full answer...
  • Do Green Wires from Stop Light Switch Kit and Roadmaster 9700 Get Connected Together
    The green wire from the stop light switch kit # RM-751428 for your 2011 Chevy HHR actually connects to the braking system monitor wire (patch cord) that eventually runs to the motor home cab to tell you that the vehicle brake pedal is actually moving. This connection is step 5 in the braking system instructions. The green wire on the # RM-9700 connects to that diode you mentioned and from that diode to the tow bar wiring lighting system's wiring harness. So the two green wires have different...
    view full answer...
  • Parts Needed to Flat Tow a 2017 GMC Terrain AWD Behind an RV
    I completely understand how you feel. Flat towing a vehicle can seem overwhelming but I am happy to walk you through the parts you will need. The first thing to check is the vehicle owner's manual. I checked it online and on page 266 it states that front-wheel drive and all-wheel drive models can be flat towed! So that is a step in the right direction. You will also want to look through that section of your owner's manual for the procedures required to flat tow your 2017 GMC Terrain. The...
    view full answer...
  • Universal Transmitter and Receiver for LED Functions with Brake Buddy Classic Supplemental System
    The Brake Buddy system is a manufacturer we don't carry, but it sounds like you simply want to know when your vehicle brakes are being activated so I do have a solution for you. You can use the Roadmaster Universal Brake Monitor # RM-9530 which will be an easy LED system to give you the information you are seeking. I've attached a couple of videos to assist.
    view full answer...
  • Do Fuses have to be Pulled to Flat Tow a 2014 Jeep Wrangler Unlimited
    From the information I found you will not have to pull any fuses to flat tow your 2014 Jeep Wrangler Unlimited. I also consulted an online copy of the owners manual and it does not say you have to pull fuses to flat tow the vehicle. Please consult your owners manual to confirm and for additional information on flat towing your Jeep. I have included some helpful links to are help articles on flat towing for you.
    view full answer...
  • Using Portable Brake Lights With Roadmaster 9700 Portable Braking System on 1998 Chevrolet Cavalier
    I looked up the instructions from Roadmaster for the 9700 Portable Braking System, part # RM-9700. I found that there is a way to use portable magnetic tail lights with part # RM-9700, but additional connectors and use of a circuit tester, part # 40376, will be required. You will need to peel back a section of wire covering on the electrical cable of the portable tail lights long enough to attach two connectors. Then, you will need to use a circuit tester to find the combined left and...
    view full answer...
  • Will Roadmaster 9700 Braking System Work with Air Brakes
    The Roadmaster 9700 Portable Supplemental Braking System # RM-9700 referenced in your question will indeed work with a motorhome/RV that has air brakes. This system will receive the signal from your brake lights so will still produce the necessary signal and power to apply the brakes in your towed vehicle. If you can tell me the year/make/model of the vehicle you are wanting to tow, I will be happy to recommend the additional components that you will need. I have attached an article...
    view full answer...
  • Why Diodes With Roadmaster 9700 Braking System
    No, the turn signals or hazard lights are not going to trigger the brakes of the Roadmaster 9700 Portable Supplemental Braking System # RM-9700 with the use of the two diodes. You correctly noted it did need two because of your Jeep's combined lighting system, but the diodes are simply preventing feedback. They are needed to attach to the green and yellow wires because the system only activates when it receives feedback from both wires at the same time. So just the turn signal won't activate it.
    view full answer...
  • Best Supplemental Braking Options for 2017 GMC Terrain
    There are more than two braking options for your 2017 Terrain. But I'll give you the two best options. For a permanent install the DUO part # SM99251 is the best option. It installs the easiest and performs the best. Then for a setup similar to the 9700 the Blue Ox Patriot part # BRK2019 is the best removable option. This is a more reliable and better performing kit by far than the 9700. You only need one of these systems installed.
    view full answer...
  • Does Roadmaster 9700 Supplemental Braking System Work with 2012 Honda CR-V
    For your 2012 Honda CR-V the Roadmaster # RM-9700 that you referenced is a confirmed fit and will work just fine with the brake setup of the vehicle. You will also need the outlet kit part # RM-9332 since it looks like your battery needs to be disconnected.
    view full answer...
  • Troubleshooting Roadmaster 9700 Brake System that Shows False Breakaway Pull Alert
    I spoke with Roadmaster and they said it's most likely a ground or wiring issue. Here's what they sent me: It sounds like there is a ground, wiring or moisture issues. Easy ground test would be to take jumper cables and connect them to the frame rails of the motorhome and the towed vehicle. If everything starts functioning properly then you have a bad ground and it needs to either be fixed or relocated. If water or enough moisture has built up inside the break away box or 6 way connector...
    view full answer...
  • Roadmaster 9700 Portable Braking System Compatibility with 2007 Ford Edge SEL
    The Roadmaster 9700 Portable Supplemental Braking System - Preset # RM-9700 is compatible with your 2007 Ford Edge SEL. If you already have this system and want to install it on your vehicle, then I recommend the RoadMaster Second Vehicle Kit for 9700 Braking System # RM-98800. Your vehicle will also need the Roadmaster Brake-Lite Relay Kit for Towed Vehicles # RM-88400 to prevent the towed vehicle's brake signal from overriding the turn signal from the RV when applying the brakes during...
    view full answer...
  • Will Roadmaster 9700 Portable Braking System Work with Blue Ox Bulb and Socket Kit BX8869
    Yes, you can use the Roadmaster supplemental braking system # RM-9700 with the Blue Ox bulb and socket kit # BX8869. Roadmaster has their own bulb and socket kit that installs the same way as the Blue Ox. There may be other parts needed though so I would need to know the year, make, and model of the vehicle you will be flat towing to determine if there is anything else you will need.
    view full answer...
  • Supplemental Braking and Safety Chain Recommend for 2014 Jeep Grand Cherokee Getting Flat Towed
    To flat tow a vehicle you will need a base plate kit, a tow bar, supplemental braking, safety chains, and lighting. It sounds like you have the lighting, base plate and tow bar and are possibly in need of the rest. For safety cables you can use # RM-643. The coiled design helps keep the cables off of the ground. And finally, most states now require supplemental braking in the vehicle being flat towed. The easiest system to set up and use is the Blue Ox Patriot II, # BRK2016, that...
    view full answer...
  • Parts Needed to Use EvenBrake System for Flat Towing a 2000 Jeep Grand Cherokee as a 2nd Vehicle
    If you are planning on towing 2 different vehicles and using the Roadmaster 9700 Portable Supplemental Braking System # RM-9700 for both then I highly recommend installing the Second Vehicle Kit # RM-98800 on your 2000 Jeep Grand Cherokee. This kit comes with everything needed for the breakaway switch, a diode, and a wire for your brake signal. The attached installation instructions highlight how to install this kit if you already have a bulb and wire kit like # RM-155 that you installed...
    view full answer...
  • Is Monitor of Roadmaster 9700 Wired or Wireless
    The monitor of the Roadmaster part # RM-9700 that mounts in the tow vehicle is a wired connection and not wireless. If you check out pages 7 and 8 of the install instructions link I attached you'll see how this portion of the kit is installed.
    view full answer...
  • Comparing Direct-Connect and Crossbar Base Plates for 2018 Jeep Wrangler JL Unlimited
    The difference between the Roadmaster Direct-Connect Base Plate Kit # RM-521453-5 and Roadmaster Crossbar-Style Base Plate Kit # RM-521453-4 is how tow bars attach. As the name suggests, you will connect your tow bar straight to the direct-connect base plates while the crossbar style will require you use your tow bar's crossbar or quick-disconnect. This makes the direct-connect the easiest base plate to connect to and disconnect from. Because of that, for your 2018 Jeep JL Wrangler Unlimited...
    view full answer...
  • Will Roadmaster 9700 Brake System Activate Brakes When Motorhome Turn Signal is Engaged
    Great question! I reached out to my contact at Roadmaster who said that the Roadmaster 9700 Portable Supplemental Braking System # RM-9700 will only activate the brakes on your towed vehicle when it receives signal on both the yellow and green wires. This applies to the RoadMaster Second Vehicle Kit # RM-98800 you referenced as well. The only time that this becomes a problem is in the event that you have your hazards on and driving down the road. To avoid the braking system pulsing...
    view full answer...
  • Solution for Needing a Coiled 7-Way to 7-Way Adapter
    I have a solution for you, but surprisingly we don't offer a coiled 7-way to 7-way extension for flat towing. What you would need is to start with the part # 54006-044 and then wire it to the part # A7WCB so that you have a coiled 8 foot long 7-way to 7-way. This has all 7 wires that you needed.
    view full answer...
  • Parts Needed to Flat Tow 2006 Jeep Liberty
    There are a number of parts required to flat tow your 2006 Jeep Liberty, which I'll list for you. These parts are all needed and are the best value for your Jeep: - Base Plate Kit: Roadmaster Direct-Connect Base Plate Kit # RM-521423-5 - Tow Bar: etrailer SD Non-Binding Tow Bar for Roadmaster Direct-Connect Base Plates # e74ZR - Wiring Kit: Hopkins Custom Tail Light Wiring Kit for Towed Vehicles # HM56203 - Supplemental Braking System: Roadmaster 9700 Portable Supplemental Braking...
    view full answer...
  • Are Flat Towing Parts for 2016 Chevy Equinox the Same as 2019 Chevy Equinox
    The parts to flat tow a 2016 Chevy Equinox and 2019 Chevy Equinox are different because the vehicle underwent a style change but if you are looking to flat tow both I'll give you what you need for each, starting with a 2019 Chevy Equinox: - Base Plate Kit: Demco Tabless Base Plate Kit # DM9519332 - Tow Bar: Demco Excali-Bar III Non-Binding Tow Bar # DM9511013 - Wiring Kit: Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit # RM-15267 (if the Equinox is a Premier model) OR Roadmaster...
    view full answer...
  • Replacement Wiring for Roadmaster Brake Pro 9300
    I have a solution for you, but the Roadmaster Second Vehicle Kit for Roadmaster 9700 # RM-98800 is only designed to work with the Roadmaster # RM-9700 and not the Roadmaster Brake Pro. Instead, you'll want to use the Second Vehicle Brake Kit for Roadmaster Brake Pro # RM-98162 to wire your Brake Pro into your 2015 Nissan Versa Note.
    view full answer...
  • Parts Needed To Flat-Tow a 2000 Ford Expedition 2WD/RWD
    In order to flat-tow a 2000 Ford Expedition you'll need base plates, a tow bar, safety cables, wiring harness, and supplemental braking system. If you have a RWD/2WD model then you'd also need a drive shaft coupling disconnect which we don't offer but I can point you in the direction where to find one. I will attach the parts below minus the coupling. Roadmaster Crossbar-Style Base Plate Kit part # 456-15 (Must Use for StowMaster) Roadmaster StowMaster Tow Bar part # RM-501 RoadMaster...
    view full answer...
  • Use of Base Plate Kit and Tow Bar on 2000 Land Rover Discovery II w/ Dealer Installed Brush Guard
    I contacted our representative at Roadmaster and he informed me that the Roadmaster XL Base Plate Kit, part # 1910-1 will work with your dealer installed brush guard. To complete your flat-towing setup, you will need a tow bar, safety cables, wiring or lighting, and a supplemental brake system. The Roadmaster Falcon All Terrain Tow Bar, part # RM-522, would be a good option for a tow bar as it is a non-binding tow bar. The non-binding feature makes for easier hookup and disconnecting...
    view full answer...
  • Which Roadmaster Base Plate Kit Will Fit My 2004 Ford F-150
    For your 2004 Ford F-150, I recommend the Roadmaster XL Base Plates, # 495-1A. These base plates fit the XL, XLT, and Lariat models. There are no base plates available for the STX, FX4, or Harley Davidson models. In addition to a base plate kit, you will need a tow bar, safety cables, wiring or lighting kit, and a supplemental braking system. For a tow bar that is compatible with the XL base plates, I recommend the RoadMaster Falcon 2 Tow Bar, # RM-520. It is the most popular tow...
    view full answer...

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Info for this part was:

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Updated by:
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Expert Research:
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Video Edited:
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Installed by:
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