How Does the Roadmaster Brake Pressure Reducer Work, and Where Does it Install?
Updated 11/06/2025 | Published 03/05/2025
Products Featured in This Question
Question:
how does this brake reducer work? Will i have to adjust this differently from everyday driving vs flat towing? I have 2022 Nissan frontier. Where do you install this reducer?
asked by: Curt H
Expert Reply:
Hello Curt,
Great question! The Roadmaster Brake Pressure Reducer # RM-900002 is designed for use with the BrakeMaster Supplemental Braking System # RM-9160 to reduce braking force on your towed vehicle. It helps prevent excessive braking that could lead to some nasty wear on your Frontier's brakes while flat towing.
This reducer installs in-line on the air supply line going to the BrakeMaster actuator inside your 2022 Nissan Frontier. It's usually placed under the dash or along the air line from the RV to the actuator.
You don’t need to adjust it between flat towing and regular driving. It only affects braking when the supplemental system is in use, leaving your Frontier’s normal braking untouched.
If your towed vehicle’s brakes feel too strong while towing, this reducer can help by limiting air pressure to the actuator.
Are you getting the Frontier ready to flat tow? Do you have any of the components? If you need any help getting the parts together, just let me know, I am happy to help!
Product Page this Question was Asked From
Roadmaster Brake Pressure Reducer for BrakeMaster Flat Tow Brake System
- Accessories and Parts
- Flat Tow Brake System
- Air Lines
- Pressure Reducer
- Roadmaster
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Shop: Roadmaster Brake Pressure Reducer for BrakeMaster Flat Tow Brake System
- Shop: Vehicle Tow Bar Brake System
- Video: Roadmaster Tow Bar Braking Systems RM-900002 Review
- Shop: Replacement Mounting Post for Roadmaster BrakeMaster Systems
- Search Results: roadmaster 9160
- Search Results: air brakes flat tow brake system
- Q&A: Parts Needed to Flat Tow a 2008 Dodge Ram 1500 or 2009 Wrangler Using a Roadmaster Falcon 2 Tow Bar
- Q&A: How to Run Air Line on Motorhome to Activate Roadmaster BrakeMaster System
- Q&A: Installing The Roadmaster RM-9160 On A 2005 Fleetwood Discovery 39L
- Q&A: Can BrakeMaster Braking System Be Connected to Quick Disconnect Valve on 2013 Thor Palazzo RV
- Shop: Roadmaster BrakeMaster for RVs w/ Air or Air-Over-Hydraulic Brakes - Proportional
- Shop: Vehicle Tow Bar Wiring
- Shop: Demco LED Tow Light Bar for Towed Vehicles w/ Wireless Transmitter - 12V Power
- Shop: Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Way to 6-Way Coiled Adapter Cord
- Article: Trailer Wiring Diagrams
- Video: An In-Depth Look at the Roadmaster Battery Charge Line Kit for Towed Vehicles
- Search Results: trailer hitch
- Shop: Trailer Hitch
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Shop: Trailer Wiring
- Shop: Blue Ox Patriot Portable Flat Tow Brake System - Proportional
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: Which is Better Roadmaster or Blue Ox Tow Bar
- Search Results: trailer tires and wheels
- Shop: Suspension Enhancement
- Q&A: How to Replace a Lance 6-Pin Plug w/ a Standard 7-Way Connector
- Search Results: trailer wiring
- Video: How to Choose a Trailer Brake Controller
- Article: How to Measure Your Trailer Wheel Bolt Pattern
- Shop: Roadmaster Battery Charge Line Kit for Towed Vehicles
on Accessories and Parts
Kate F.
10/27/2025
Hey Curt, how did things go with the brake pressure reducer on your Frontier? Did it smooth out the braking when you used the BrakeMaster system for flat towing? Your update could make it easier for others setting up a similar setup.