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  1. Tow Bar Braking Systems
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  6. Air Over Hydraulic Brakes
Roadmaster BrakeMaster w Pressure Reducer for RVs w Air or Air Over Hydraulic Brakes - Proportional

Roadmaster BrakeMaster w Pressure Reducer for RVs w Air or Air Over Hydraulic Brakes - Proportional

Item # RM-9160-900002
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Our Price: $818.27
Tow Bar Braking Systems

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Product Expert Lindsey S

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

Yes, if you:

  • Own a motorhome with air brakes or air-over-hydraulic brakes
  • Have a nicer or newer car and want the most precise braking possible
  • Tow a hybrid or other car with continuous-power-assist brakes

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 is designed for cars with active or power-assist brakes. Connects directly to RV brakes and applies brakes in the towed car using the same force that you apply in the RV. Actuator removes for storage. Lowest Prices for the best tow bar braking systems from Roadmaster. Roadmaster BrakeMaster w Pressure Reducer for RVs w Air or Air Over Hydraulic Brakes - Proportional part number RM-9160-900002 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (69)
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Roadmaster Tow Bar Braking Systems - RM-9160-900002

  • Brake Systems
  • Proportional System
  • Air Brakes
  • Air Over Hydraulic Brakes
  • Fixed System
  • Roadmaster
  • Recurring Set-Up
  • Power Assist Brake Compatible

Truly proportional braking system with breakaway is designed for cars with active or power-assist brakes. Connects directly to RV brakes and applies brakes in the towed car using the same force that you apply in the RV. 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
  • Included pressure reducer keeps system from applying too much pressure to towed car's brake pedal
    • Compatible with vehicles that have active or continuous-power-assist brakes
    • Connects to air line in towed car and adjusts to set and lock the braking pressure
  • 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.

Brake Pressure Reducer

Pressure Reducer

Automobiles with active or continuous-power-assist brakes maintain braking ability even when the engine is off, resulting in a situation in which minimal pressure is needed to engage the brakes. Supplemental braking systems may inadvertently use too much force to engage your towed car's brakes because they are typically designed to work with cars that do not have active brakes. The included brake pressure reducer allows you to set the BrakeMaster system to use the exact pressure desired so that overbraking and subsequent damage can be avoided.

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

900002 Road Master Brake Pressure Reducer

Installation Details RM-9160-900002 Installation instructionsAlternate Instructions RM-9160-900002 Installation instructions

This Product Fits The Following Vehicles

Customer Reviews

Roadmaster BrakeMaster w Pressure Reducer for RVs w Air or Air Over Hydraulic Brakes - Proportional - RM-9160-900002

Average Customer Rating:  4.7 out of 5 stars   (69 Customer Reviews)

Truly proportional braking system with breakaway is designed for cars with active or power-assist brakes. Connects directly to RV brakes and applies brakes in the towed car using the same force that you apply in the RV. Actuator removes for storage.

Ask the Experts about this Roadmaster Tow Bar Braking Systems

  • Exploded Diagram of the Roadmaster BrakeMaster
    Yes, we do. Check out the picture I attached that shows a diagram of all of the parts of the Roadmaster BrakeMaster # RM-9160-900002 that you referenced. Once you figure out which parts you need email me back and if we do not have the parts on our site currently I will have them added for you.
    view full answer...
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  • Is There Specific Area on 2018 Chevy Equinox to Get Through Firewall With Roadmaster BrakeMaster
    There is not a specific area in a 2018 Chevy Equinox to get through the firewall that we have been made aware of. I took a look at the directions for installing the Roadmaster BrakeMaster System # RM-9160 with the RoadMaster Second Vehicle Kit for BrakeMaster Systems # RM-98100 and the directions only state "if there is no pre-existing hole or grommet with sufficent space, drill a 1/2" hole through the firewall." What you are experiencing is not particularly unusual and the only solution...
    view full answer...
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  • Supplemental Braking System Recommendation for a Vehicle with Manual Brakes
    We have exactly what you will need. I spoke to my contact at Roadmaster and he informed me that you have two options depending on the braking system of the tow vehicle. Either you will want part # RM-9060-900002 for if your RV has hydraulic brakes or part # RM-9160-900002 for if your RV has air or air over hydraulic brakes. Both of these systems come with a pressure reducer that allows you to reduce the pressure the braking system will apply to your Scout's brakes so that you can fine...
    view full answer...
  • Installation Instructions for Roadmaster Brake Lite Relay and Brakemaster 9000
    There are two methods of installation for the Roadmaster Brake Lite Relay part # RM-88400 that you referenced, open and closed. Most towed cars require the normally open installation method. Ford and Lincoln models with neutral tow kits and most automobiles that have a push-button start function will require the normally closed installation. Check out the diagram that details the installation. Remove the blue wire from the kit. This wire is not needed for normally open applications. Locate...
    view full answer...
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  • Is There Version of Roadmaster Brakemaster that Fits Air Brakes and Hydraulic Brakes
    Roadmaster does offer a version of the Brakemaster for RVs that have hydraulic brakes with the part # RM-9060 like it sounds like you have. The other version they offer is for vehicles with air or air over hydraulic brakes like the part # RM-9160-900002.
    view full answer...
  • Is There a Supplemental Braking System that Works with a Brake Controller in the RV
    Most states do require that a supplemental braking system be installed on a vehicle being flat towed. This would be especially crucial when coming down steep grades as you stated. Although we do not have any supplemental braking systems that receive their signal from a brake controller, such as the Tekonsha Prodigy P3 # 90195, we do have systems that apply the brakes in your towed vehicle proportionally just like a the Prodigy P3 would. From what I could find it looks like the Blue Ox...
    view full answer...
  • Recommended Wiring When Flat-Towing A 2000 Honda CR-V
    When installing the Roadmaster BrakeMaster w/ BrakeAway and Pressure Reducer, part # RM-9160-900002 there are a few things that will also be needed to complete the installation. You will need the RoadMaster BrakeMaster Custom Seat Adapter, part # RM-88160. This mounts beneath the CR-V seat and is hidden when the brake system is not being used. You will still need to install the Roadmaster 6-Diode Universal Wiring Kit, part # 154-792-118158 because you need turn signals when towing...
    view full answer...
  • Part Recommendations For Flat-Towing A 2006 Hummer H3
    In order to be able to flat-tow your 2006 Hummer H3, there are 5 items needed. You will need base plates for the Hummer, a tow bar, safety cables, lighting for the H3, and most states now require a supplemental brake system. The base plates I recommend are the Roadmaster Base Plates, part # 2505-3. When the front arms are removed the system is virtually invisible. The tow bar I recommend is the Roadmaster Falcon 2 Tow Bar, part # RM-520. This tow bar has a weight capacity of 6,000 lbs....
    view full answer...

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Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Shelly K
Updated by:
Shelly K
Employee Amanda M
Updated by:
Amanda M
Employee Isabelle B
Updated by:
Isabelle B

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