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Replacement Transmitter for Roadmaster Even Brake Braking Monitor - Serial Numbers Up to 27,496

Replacement Transmitter for Roadmaster Even Brake Braking Monitor - Serial Numbers Up to 27,496

Item # RM-9420
Our Price: $116.59
You Save: $49.14
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Replace the transmitter of your Roadmaster Even Brake braking monitor (RM-9430). For Even Brake systems with serial numbers up to 27,496. 1-800-940-8924 to order Roadmaster accessories and parts part number RM-9420 or order online at Free expert support on all Roadmaster products. Great prices and Fastest Shipping for Replacement Transmitter for Roadmaster Even Brake Braking Monitor - Serial Numbers Up to 27,496. Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (30)
  • Q & A (0)
  • Videos (1)
  • Photos

Roadmaster Accessories and Parts - RM-9420

  • Tow Bar Braking Systems
  • Brake Monitoring
  • Transmitters
  • Roadmaster

Replace the transmitter of your Roadmaster Even Brake braking monitor (RM-9430). For Even Brake systems with serial numbers up to 27,496.


  • Replaces the ICX box transmitter of your Roadmaster Even Brake braking monitor (RM-9430)
  • Relays signals to the receiver mounted in the RV
  • Works with Roadmaster Even Brake supplemental braking systems (RM-9400) with serial numbers below 27,496
  • Made in the USA
  • Limited lifetime warranty

Note: This kit is for Even Brake systems with serial numbers below 27,497. If your Even Brake has a serial number above 27,497, you will need kit RM77FR (sold separately).

9420 Replacement Toad Braking Monitor Transmitter for Road Master EvenBrake Supplemental Braking Systems - ICX Box - SN Below 27497

Installation Details RM-9420 Installation instructionsAlternate Instructions RM-9420 Installation instructions

Video of Replacement Transmitter for Roadmaster Even Brake Braking Monitor - Serial Numbers Up to 27,496

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Review of Roadmaster Tow Bar Braking Systems - Even Brake Transmitter - RM-9420

Hello everybody, this is Jeff at Today we're gonna take a look at this Roadmaster transmitter for the even brake systems with the serial number lower than 27,496. Now this is an ICX transmitter that'll work with the Roadmaster even brake supplemental breaking systems. This does include everything shown here on the table. The transmitter itself, the mounting pads for installing it and the installation hardware. Now this ICX transmitter will install inside your towed vehicle and it relays information about that vehicle's braking activity or a change in the system status to the even break receiver monitor that would be installed in your motor home.

Now the receiver monitor is not included with this part number. We do sell that separately on our website. It's part number RM-9410 and it is listed on this product page as a related product. This part is made in the USA and again the note I do wanna mention if your even break has a serial number that is under 27,496 then this is the correct part you need. If your serial number is higher than that number, then you'll need the transmitter part number RM77FR which is sold separately on our website.

But that should do it for the review on this Roadmaster transmitter for the even brake systems with serial number lower than 27,496.

Customer Satisfaction Score:

Customer Reviews

Replacement Transmitter for Roadmaster Even Brake Braking Monitor - Serial Numbers Up to 27,496 - RM-9420

Average Customer Rating:  4.6 out of 5 stars   (30 Customer Reviews)

Replace the transmitter of your Roadmaster Even Brake braking monitor (RM-9430). For Even Brake systems with serial numbers up to 27,496.


I am getting false readings and alerts at monitor. Ex: brakes are applied, tow vehicle has come disconnected etc.. pull over to check and everything is fine. I unplugged monitor or it just goes off all the time. This happens on two different vehicles I tow which have separate transmitters.

Etrailer Expert

Jenny N.


I reached out to Roadmaster about what you are experiencing. This could be happening because the vehicle that is being used at that time is sharing some device with the same frequency as the ICX transmitter in that vehicle and it would be best to try changing the channel to a different frequency used between the ICX transmitter and the RV monitoring device. I am sending you the instruction manual that can help via email.


The unit came with the wrong installation instructions. It came with the receiver instructions instead which is extremely frustrating!


Product came fast and as ordered!


Exactly what we ordered, thank you!!


Installed transmitter to replace defective unit, synched with receiver in coach. Brakes working.

Mike P.


HI Bob - I have issues with my Even Brake where the unit says it cannot detect a brake switch, however when I test the switch it is OK. It is an intermittent problem. I pulled the green wire off the ICX transmitter and replaced the crimp end, then anchored the wiring so there is NO STRAIN on the wiring to the ICX transmitter and still have the issue, so I think it could be a bad ICX transmitter.How did you know your transmitter was bad?Thanks,Mike P

Bob A.


For Mike P. I tested for voltage to the transmitter. Voltage was present so unit should have detected.


I was preparing to leave on a month-long RV trip when my Even Brake required repair. I contacted Roadmaster, and troubleshooting revealed a bad transmitter. Roadmaster said it would be about two weeks to get a replacement, but suggested I might be able to get it more quickly from I ordered one on line and promptly received it. Thanks to e-trailer we are on the road!


Works as advertised. Wires coming out of unit not well protected/anchored. I wonder why this can't be designed to be integrated into the Even Brake unit itself instead of having a separate device to install? Alternately, it could be designed to be powered by the Even Brake unit instead of separately: You already have to plug in a USB-type connection from the Even Brake. I wired mine up with a flat-4 trailer-type connector so I could install and remove it from my vehicle easily.


The product did not fix my problem as Roadmaster stated it would. I had to send the brake unit in for repair.
The unit worked well when synced with the repaired braked unit.


Good instructions; item exactly as advertised. Company shipping is lightning fast and communication was excellent. Buy with confidence!

John S.


Still working great, and with moderately heavy use.


I broke the old device trying to add a power switch to the device, ordered a new one and all is well.

David F.




just received this yesterday so all I can rate is the shipping.


It seems to work!


well i can not test this till the 1 first week of aprill ,so i would think it ok hoppfully for the tranmiter ,iam in quebec and ordered thought my mother in law (snow bird comming back end of the mouth,
but must say for for sevice and Price and allso for information and detail on items TOPS!, Best place i found on google to order .



very good as expected


I have ordered many products from etrailer and their customer service is 12 on a scale of 1 to 10. I ordered my products on the weekend and they were delivered on a Wed. I also later found cheaper prices on a few of the items and submitted the info for the 110% lower price guarantee and received the refund within a few hours. These folks are just plain great!


Great service at a fair price. Would use them again! Needed the part ASAP and etrailer had it!


Great product


No wiring information with unit . It would help if you sent a complete package.

Etrailer Expert

Rachael H.


Thanks for the feedback and review, this product is intended to be used as part of the complete Even Brake system from Roadmaster. I have included a link to the complete installation instructions for your reference.


Worked as expected, made a call for some technical help and they were able to answer my question and had me going on no time


Fast Shipping and right part that I ordered and best of... it worked!




Excellent products


arrived on time and was as expected


Great product and fast service. Thanks!


Works as it should.


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Info for this part was:

Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Jeff D
Installed by:
Jeff D
Employee Wilson B
Updated by:
Wilson B
Employee Amanda K
Updated by:
Amanda K

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