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Dexter Electric Trailer Brake Assembly - Self-Adjusting - 12-1/4" - Right Hand - 9K to 10K

Dexter Electric Trailer Brake Assembly - Self-Adjusting - 12-1/4" - Right Hand - 9K to 10K

Item # 23-451
Our Price: $295.70
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Shipping Weight: 20 lbs
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Accessories and Parts 23-451 - Brake Assembly - Dexter
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12-1/4" x 3-3/8" Passenger's-side electric brake fits 9,000-lb to 10,000-lb axles. Mounting flange has a 7-bolt pattern. Self-adjusting brakes require little maintenance. Fits 15" or larger wheels. 1-800-940-8924 to order Dexter accessories and parts part number 23-451 or order online at Free expert support on all Dexter products. Great prices and Fastest Shipping for Dexter Electric Trailer Brake Assembly - Self-Adjusting - 12-1/4" - Right Hand - 9K to 10K. Accessories and Parts reviews from real customers.
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  • Reviews (25)
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Dexter Accessories and Parts - 23-451

  • Trailer Brakes
  • Electric Drum Brakes
  • Brake Assembly
  • 12-1/4 x 3-3/8 Inch Drum
  • Dexter
  • RH
  • Self Adjust
  • 9000 lbs
  • 10000 lbs

12-1/4" x 3-3/8" Passenger's-side electric brake fits 9,000-lb to 10,000-lb axles. Mounting flange has a 7-bolt pattern. Self-adjusting brakes require little maintenance. Fits 15" or larger wheels.


  • Electric brakes are easier to install and offer more user control than hydraulic brakes
    • Requires only an electric brake controller (sold separately) - no actuator or hydraulic lines necessary
  • Self-adjusting brakes automatically adjust to deliver optimum performance and braking power
    • No need for manual brake adjustments
    • Proper adjustment leads to better brake efficiency and less wear on your tow vehicle's brakes
  • Mounting bolts and hardware sold separately
  • Made in the USA


  • Application: most standard hub-and-drum assemblies, including Dexter and Lippert (LCI)
  • Configuration: right hand (passenger's side)
  • Dimensions: 12-1/4" diameter x 3-3/8" wide
  • Mounting flange bolt pattern: 7 bolt
  • Wheel size: 15" or larger
  • Axle rating: 9,000 lbs - 10,000 lbs
  • Limited 5-year warranty

K23-451-00 Dexter Electric Brake Assembly, RH 12-1/4" x 3-3/8" - Self Adjust - 9,000 lbs to 10,000 lbs

Replaces 23-451

Customer Satisfaction Score:

Customer Reviews

Dexter Electric Trailer Brake Assembly - Self-Adjusting - 12-1/4" - Right Hand - 9K to 10K - 23-451

Average Customer Rating:  4.8 out of 5 stars   (25 Customer Reviews)

12-1/4" x 3-3/8" Passenger's-side electric brake fits 9,000-lb to 10,000-lb axles. Mounting flange has a 7-bolt pattern. Self-adjusting brakes require little maintenance. Fits 15" or larger wheels.

by: 06/01/2021

Lori was able to help me identify the correct brake assembly for my trailer and get it to me ASAP. My order was shipped the same day it was placed and arrived prior to the estimated delivery date! The part is actual Dexter brand as advertised, packaged well, and arrived in perfect condition. PERFECT experience thanks to the etrailer team!


Awesome quick delivery!


Perfect is all I can say about this product. Exact match and extremely easy installation. Outstanding customer service, located exact same item from another supplier and the processing the "Lowest Price Pledge" adjustment was received quickly. Cannot say enough about the ease of ordering and fast delivery from etrailer. Will certainly be a returning customer.

Yes, these items are still performing as expected no issues what so ever.Thanks for checking in.
HLC - 09/28/2015




Delivery was early by 3 days & it is at the shop to be installed.


Easy to find what I needed. Easy checkout. Item arrived on time and was a perfect fit.


I am completely Satisfied With the Products I received a year ago and have since then order more parts for my fleet needs was impressed with my last order and will continue doing business with this company as long as I live


Dexter brakes bolted right up and works great


Fast delivery and great price


Fit perfect, and work very Good.

Thank you for check on you product, it been working very well, and for GOOD quilts service .
David D - 12/09/2017


Good parts and customer service.

Still working good.
William - 04/22/2015


Helpful friendly and fast delivery





Found exactly what I needed on website. Great buying experience. Thanks


Exact fit



good price!!!





works great





See what our Experts say about this Dexter Accessories and Parts

  • How to Know which Side of the Trailer a Drum Brake Assembly Should Install
    The actuating arm (the bracket that the brake magnet attaches to), should go in front of the spindle in relation to the forward direction of the trailer. Another way to look at is that the arm is the front of an "arrow," and it always points towards the front of the trailer. See picture for further explanation.
    view full answer...
    Image 1 for
  • Electric Brake Assembly for Sundowner Horse Trailer
    We offer both complete electric brake assemblies and replacement parts for them. Often it is more cost-effective to replace the entire brake assembly than to purchase the various replacement parts to repair one but we can help with either option. Brake assemblies are selected based on axle capacity. For example, if your trailer uses a 10,000-lb-rated axle then appropriate electric brake assemblies for that weight capacity are available in two sizes: 12-1/4 x 3-3/8-inch and 12-1/4 x 4-inch....
    view full answer...
  • Troubleshooting Trailer Brake Assembly that Locks Up When Spun Forward
    Pull the hub off on the problem wheel. I bet your brake assembly has a mechanical problem and just needs to be replaced. For a replacement Dexter brake assembly for the right hand side of a 10k Dexter axle you would want the part # 23-451.
    view full answer...
  • How Much does the Dexter 12-1/4 Inch x 3-3/8 Inch Electric Brake Assembly # 23-451 Weigh
    I pulled the Dexter Electric Trailer Brake Assembly, # 23-451, from my warehouse and found that it weighs 17.9 lbs. The shipping weight, which includes the packaging is approximately 23 lbs.
    view full answer...
  • What Gauge Wire Should be Used When Installing Brake Assemblies on a Trailer
    You want to use at least 10 gauge wire when wiring up brake assemblies like the Dexter Electric Trailer Brake Assembly # 23-451 on a trailer. I attached an FAQ on trailer wiring for you to check out also.
    view full answer...
  • How to Determine What Brake Assembly Goes On What Side of Trailer
    You referenced the Dexter Electric Trailer Brake Assembly # 23-451 so I will use it as an example. This is a right hand brake assembly, and by that I mean that is goes on the passenger side of the vehicle. The actuating arm (the bracket that the brake magnet attaches to), should go in front of the spindle in relation to the forward direction of the trailer. Another way to look at is that the arm is the front of an "arrow," and it always points towards the front of the trailer. See picture...
    view full answer...
    Image 1 for
  • How To Choose The Correct Brake Assemblies For A 1994 Sundowner Horse Trailer
    In order to determine which brake assemblies will replace the current brakes on your 1994 Sundowner Horse Trailer, you're going to need to first determine the weight capacity of your axles, which usually can be found on a tag on the axle tube. The next thing you're going to need to measure the width and diameter of your current brake assemblies. For example, the Dexter Electric Trailer Brake Assembly - Self-Adjusting # 23-451 that you inquired about, will work for 9,000-10,000lbs axles,...
    view full answer...
    Image 1 for
  • Replacement Electric Brake Assemblies For a 2018 Big Tex 22GN Trailer With 10K Dexter Axles
    The Dexter Electric Brake Kit # 23-450-451 are the brakes you will need for your 2018 Big Tex 22GN with the 10,000lb Dexter axles. These are sold per axle so you will need 2 sets to replace all 4 of your brake assemblies. They are also sold individually as the Left # 23-450 and Right # 23-451 if you have a need to only replace one in the future. With self adjusting brakes like these it is more common for them to all wear evenly and need replaced at the same time.
    view full answer...
  • Replacement Dexter Brake Assembly Recommendation for a 9k Dexter Axle
    So I was able to pull up some information on your Dexter Axle and based on the 008-232-05 number you listed it looks like you have a 9k rated axle. So for Dexter 9k brake assemblies you would want the part # 23-451 for the right side and part # 23-450 for the left side. These assemblies are 12-1/4 inch by 3-3/8 inch and are self adjusting. These also use a 6 lug bolt pattern to attach to the spindle of the trailer. Check out the review video I attached as well.
    view full answer...
  • Will Dexter Electric Trailer Brake Assembly # 23-450 Fit Lippert Axle
    In order to determine whether or not the Dexter Electric Left Hand Trailer Brake Assembly, # 23-450, will fit your Lippert axle, you will need to measure the distance of the mounting points on your brake mounting flange and compare it to the measurements on the picture that I have attached. For Dexter Electric Right Hand Trailer Brake Assembly, you will need part # 23-451.
    view full answer...
    Image 1 for
  • Electric Brake Assemblies for a Trailer with Dexter 10,000 Pound Axles
    It is likely that Dexter brake assemblies # 23-450 and # 23-451 are correct for your 10K Dexter axles. These brakes mount with either a 5 or 7 bolt pattern. And they do have the correct measurements; 12-1/4 x 3-3/8. Take a look at the picture I have included showing the spacing between the mounting holes for this bolt pattern to determine if these brakes will fit.
    view full answer...
    Image 1 for
  • Electric Brake Assemblies for Brake Flanges on 1971 Horse Trailer
    Electric trailer brakes should be selected based on your axle's weight capacity, which should be listed on a plate or sticker on the axle itself, and of course based on the brake flange mounting pattern. The electric brakes we offer can have 4-bolt, 5-bolt, or 7-bolt mounting patterns. Some have multiple bolt hole patterns, both 4- and 5-bolt such as the Hayes/Alko # 185100, or both 5- and 7-bolt, such as Dexter # 23-451. We do not offer brakes with a 6-bolt pattern, but that does not...
    view full answer...
  • Components Needed To Add Electric Brakes To Heavy-Duty Trailer
    Many of the axles on trailers have a plate or sticker that lists the capacity and manufacturer. These are the typical round axle diameters based on axle capacity: 1,000-lb - 2,000-lb Axles: 1-1/2 - 1-3/4 inch diameter 3,500-lb Axles: 2-3/8 inch diameter (Can have a 3-1/2 inch diameter, but rare) 6,000-lb - 7,200-lb Axles: 3 inch diameter 8,000-lb Axles: 3-1/2 inch diameter 9,000-lb Axles: 4 inch diameter 10,000-lb Or more axles: 5 inch diameter. If you do not have a brake mounting flange...
    view full answer...
  • How to Adjust Drum Trailer Brakes Using a Brake Adjustment Tool
    Yes you can adjust the drum brakes on your trailer. To see how to manually adjust trailer brake assemblies check out the video I attached, fast-forward to the 4:35 mark of the video. Basically you will adjust the brakes out so that there is a slight but constant drag of the pads on the drum when the wheel is turned. I recommend using brake adjustment tool # W80630.
    view full answer...
  • Availability of 12x3 Inch Electric Trailer Brakes for a Parker Grasshopper Grain Trailer
    As you have found, 12 x 3 inch brake assemblies are not available. It is possible though that your drum will accept a different size. If you can measure the width of the inside of the drum (where the pads make contact with the drum) you might find that 12x2 assembly like # 23-105-09 and # 23-106-09 will fit as long as the bolt pattern has the two lower bolt holes closer together than the top 2. And these assemblies are also designed for 6K axles. But I think that what is going to end up...
    view full answer...
  • Options for Adding Brakes to Sundowner Trailer with 7K Axles
    Adding drum brakes to a trailer that does not have them is usually least costly and easiest if you select electric rather than hydraulic drum brakes. Electric brakes need only basic wiring for installation and require a trailer brake controller in the tow vehicle, such as the Prodigy P3 # 90195. I linked a whole series of articles on the subject of adding brakes to a trailer. There are articles for electric, hydraulic and disc types. Many customers prefer to avoid the process of matching...
    view full answer...
  • Weak Voltage Reading at Electric Brakes on Trailer Wired with 12- or 14-Gauge Wire
    Generally we recommend using 10-gauge wire for a trailer's brake circuit wiring. In some instances, smaller trailers that have small brake assemblies might work properly with 12-gauge wiring but 14-gauge is simply too small for any electric brake circuit. Your 10-inch drum brakes will need a 10-gauge wire for their circuit. We offer 10 Gauge Primary Wire by the foot, part # 10-1-1.
    view full answer...
  • Installing Electric Brakes and Brake Controller for Use on 3500-lb 5th Wheel Trailer
    To start I suggest you review the linked article on how to add electric brakes to a trailer. This covers each of the components required and explains how to select appropriate parts for your particular application. Once your trailer is equipped with electric drum brakes and the necessary wiring to connect to your tow vehicle you will need to choose a brake controller. I suggest the popular and reliable Tekonsha Prodigy P2, part # 90885. You may be able to use a quick-connect harness to...
    view full answer...
  • Electric Brake Assembly Recommendation for a Dexter 10k Axle
    Yes, you can replace the hydraulic brake assemblies of your trailer with electric ones. It would just be a matter of removing the hubs, removing the old assemblies, installing the correct size/rated ones, and then wiring the assemblies back up to the trailer connector. I attached a help article that covers everything on adding brakes to a trailer as well as a picture of where to measure on your hubs so that you can pick out the correct size assemblies. Since you mentioned that you have...
    view full answer...
    Image 1 for Image 2 for
  • Are Drums Interchangeable When Replacing Hydraulic Brakes With Electric Brakes
    I have attached a link to a helpful article that explains all of the components needed for adding electric drum brakes to a trailer. We always recommend replacing all of the components at one time so you are sure everything works well. If you check out your 9-44 drum you currently have and the inside surface shows no signs of wear or damage you can use them when changing from hydraulic to electric brakes. I spoke with my contact at Dexter and they told me that all you would have to replace...
    view full answer...
    Image 1 for
  • Electric Trailer Brake Assembly with 6-Bolt Mounting Pattern for 1960 Airstream Tradewind Trailer
    Some of the older Airstream trailers used unique proprietary components, including brakes. We do not carry any 6-bolt brake assemblies; but we have 4-, 5- and 7-bolt types that can be seen on the link provided, such as Dexter 12-1/4 x 3-3/8-inch brake # 23-450 and # 23-451, which can use a 5- or 7-bolt mount. You will need to first confirm the axle capacity and the diameter and width of your drums to check for a suitable brake. You may be able to find a compatible brake assembly but odds...
    view full answer...
  • Replacement Brakes and Hubs/Drums for a 2002 Rolls Rite Trailer With 10K Axles
    Thanks for the info! I was able to use the serial number that you provided (D7686254) to find the correct replacement braking assemblies and hub/drum assemblies for your trailer. I have attached these for you below: Dexter Electric Trailer Brake Assembly part # 23-451 (Right Hand) Dexter Electric Trailer Brake Assembly part # 23-450 (Left Hand) Dexter Trailer Hub and Drum Assembly part # K08-288-90
    view full answer...
  • New Brakes For Horse Trailer
    It does appear you have the correct parts listed for your project, depending on how far you want to take the R&R. Dexter Trailer Hub and Drum Assembly for 9K to 10K Axles, # K08-288-90. Qty 4 Dexter Electric Trailer Brake Assembly - Self-Adjusting, # 23-450. Qty 2 Dexter Electric Trailer Brake Assembly - Self-Adjusting, # 23-451. Qty 2 Regarding " you recommend changing the back of the hub and ..." that is difficult to tell from your attached images. If you simply have typical...
    view full answer...
  • What Size Brake Assembly Fits Dexter Trailer Hub and Drum Assembly for 9K to 10K Axles
    The Dexter Trailer Hub and Drum Assembly for 9K to 10K Axles - 8 on 6-1/2 - Oil Bath - Before July 2009 # K08-288-90 uses a 12" x 3-3/8" brake assembly like the # 23-451 and # 23-450. This means that the correct brake shoe width for this hub and drum assembly is 3-3/8" wide.
    view full answer...

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