bing tracking image
  1. Flat Tow Brake System
  2. Roadmaster
  3. Stop Light Switch
Roadmaster Stop Light Switch Kit
Roadmaster

Roadmaster Stop Light Switch Kit

Part Number: RM42MR
In Stock
ChristmasTree SantaHat Arrives before Christmas SantaHat ChristmasTree
$42.70
Retail:$64.09
You Save: 33%
Flat Tow Brake System
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

Need help with installation?
Locate installers near me
Avoid damage to your vehicle by ensuring that your supplemental braking system is properly positioned and working effectively. Kit activates your RV monitoring system to alert you when the brakes of your towed car are being applied. 1-800-940-8924 to order Roadmaster flat tow brake system part number RM42MR or order online at etrailer.com. Free expert support on all Roadmaster products. Great prices and Fastest Shipping for Roadmaster Stop Light Switch Kit. Flat Tow Brake System reviews from real customers.
  • All Info
  • Reviews (608)
  • Q & A (0)
  • Photos

Roadmaster Flat Tow Brake System - RM42MR

  • Stop Light Switch
  • Roadmaster

Avoid damage to your vehicle by ensuring that your supplemental braking system is properly positioned and working effectively. Kit activates your RV monitoring system to alert you when the brakes of your towed car are being applied.


Features:

  • Activates motorhome brake-monitoring system whenever brake pedal in towed car is applied
    • Ensures that the supplemental braking system is functioning properly
  • Works great for any application that does not have a tow position in the ignition
  • Wires directly into towed car's fuse box for constant current
  • Made in the USA


Specs:

  • Application: custom fit for your vehicle
  • 12 Volts


This kit allows your RV's monitoring system to alert you whenever the brake pedal of your towed car is being applied. Other systems operate according to whether the air cylinder is extended and provide no indication of what is happening with the pedal itself. If your supplemental braking system is improperly installed, it may be continuously pressing on the pedal, impeding it from fully retracting and possibly causing damage to your vehicle's tires and braking system. With Roadmaster's Stop Light Switch Kit, you will always know when the brake is being depressed, and you will avoid costly damage.

751510 Road Master Stop Light Switch Kit

Installation Details RM42MR Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.8

607 reviews
Avoid damage to your vehicle by ensuring that your supplemental braking system is properly positioned and working effectively. Kit activates your RV monitoring system to alert you when the brakes of your towed car are being applied.

by:



by:



by:



by:



by:



by:



by:



by:



by:



by:



by:



by:



by:



by:



by:



by:



by:



by:



by:



by:



by:



by:



by:



by:



by:


25
607
Show More Reviews

See what our Experts say about this Roadmaster Flat Tow Brake System

  • Trouble Finding Brake Light Wire on a 2025 Ford F-150
    Hey Dennis, thanks for reaching out! According to the Roadmaster fitguide you're going to need a brake light switch as well since they weren't able to locate the color of the OEM brake light circuit wire. You'll use part # RM42MR if you have an adjustable brake pedal, or part # RM89ZR if you don't have an adjustable brake pedal. Once the brake light switch kit is in place, you'll have the signal you need to install the Brake-Lite Relay Kit # RM-88400. Are you installing all of your flat...
    view full answer...
  • Correct Roadmaster BrakeMaster Seat Adapter for a 2024 Ford F-150
    Hey Steve! The correct seat adapter for your 2024 Ford F-150 is the Roadmaster item # RM-88316, you were looking at. This is designed for the Roadmaster BrakeMaster item # RM-9160-900002 and item # RM-9060-900002. You're also going to need a stop light switch. There's two options depending on what brake pedals you have. I have listed them below: Adjustable Pedals - Roadmaster Stop Light Switch Kit item # RM42MR Non-Adjustable Pedals - RoadMaster Stop Light Switch Kit item # RM89ZR
    view full answer...
  • Complete Flat Tow Set Up For 2024 Ford F150 4x4 Hybrid
    Hello Vance. Wow, that is a nice truck to pull behind your motorhome! Here are all the parts I recommend for flat towing your 2024 Ford F150 4x4 Hybrid: -Base Plate Kit: Demco Tabless Base Plate Kit - Removable Arms # DM56MV -Tow Bars: Demco Dominator Non-Binding Tow Bar - RV Mount - 2" Hitch - 7,500 lbs # DM9511008 -Wiring Kit: For LED tail lights- Roadmaster Smart Diode 7-Wire to 6-Wire Wiring Kit for Variable Voltage LED Tail Lights # RM38FR. For Incandescent tail lights- Roadmaster...
    view full answer...
  • Steps To Find Cold Side Brake Light Switch Wire On 2023 Ford F-150 When Installing Brake Controller
    We haven't had a chance to install a brake controller in a 2023 Ford F-150 yet (3/27/2023), so I can't tell you the wire color but I can tell you how to figure out which one you need to hook to. You'll need to use a circuit tester like # PTW2993 and with the truck on but not running, press the brake pedal and test the wires going to the brake switch (this will be a plastic looking thing on the brake pedal arm). You're looking for one that only has power when the pedal is pressed. If you...
    view full answer...
  • Location of Cold Side of Stop Light Switch for Brake Controller Installation on 2022 Ford F-150
    It looks like the OEM brake light switch is unusable on the 2022 Ford F-150. To complete the installation you will need to add the RoadMaster Stop Light Switch Kit # RM89ZR if you do NOT have an adjustable brake pedal or # RM42MR if you DO have an adjustable brake pedal. The red wire on your # RED52VR will connect to this to complete the installation.
    view full answer...
  • Location of Brake Light Switch on 2024 Ford F-150 Raptor
    Hi Terry; I'm not sure what the exact location of the brake light switch is but we do know that it is unusable on the 2024 F-150 Raptor. What you will need to do is install the Roadmaster Stop Light Switch Kit # RM42MR. If you don't already have a wiring kit so you can use your tail lights while flat towing you need the Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit # RM-15267. You will also want a charge line kit # RM-156-25. I see you also looked at some supplemental braking...
    view full answer...

Do you have a question about this Flat Tow Brake System?


Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Ryan G
Installed by:
Ryan G
Employee Joshua S
Video Edited:
Joshua S
Employee Wilson B
Updated by:
Wilson B
Employee Amanda K
Written by:
Amanda K

At etrailer.com 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.


<