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

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

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Dexter Electric Trailer Brake Assembly - Self-Adjusting - 12-1/4" - Left Hand - 9K to 10K 9000 lbs,10000 lbs 23-450
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12-1/4" x 3-3/8" Driver'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. Call 800-298-8924 to order Dexter Axle accessories and parts part number 23-450 or order online at etrailer.com. Free expert support on all Dexter Axle products. Guaranteed Lowest Price and Fastest Shipping for Dexter Electric Trailer Brake Assembly - Self-Adjusting - 12-1/4" - Left Hand - 9K to 10K. Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (12)
  • Q & A (22)
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Dexter Axle Accessories and Parts

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

12-1/4" x 3-3/8" Driver'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: left hand (driver'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

K23-450-00 Dexter Electric Brake Assembly, LH 12-1/4" x 3-3/8" - Self Adjust - 9,000 lbs to 10,000 lbs

Replaces 23-450

Item # 23-450

Customer Reviews

Dexter Electric Trailer Brake Assembly - Self-Adjusting - 12-1/4" - Left Hand - 9K to 10K - 23-450

Average Customer Rating:  4.9 out of 5 stars   (12 Customer Reviews)

12-1/4" x 3-3/8" Driver'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.

- 23-450

Pricing was fair on the assemblies. They were exactly as stated. Shipping was reasonable and timely. 721301

- 23-450

Fast shipping!! 629510

- 23-450

Exact fit 357538

- 23-450

Dexter brakes bolted right up and works great 338477

- 23-450

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 330296

- 23-450

Perfect fit. Will order from you as nee ded 257368

- 23-450

perfect is just what I expected thanks 230669

- 23-450

I ordered my parts on Thursday and received them the next day. They were OEM Dexter parts not some aftermarket stuff, and they were 60 dollars cheaper than any local trailer parts places I checked at. Great parts, Great price, Great service !!!!!! My kinda place. 228113

- 23-450

Product is great, but delivery by ups was a problem, product was damaged! I was unable to return product as I was in process of installation! 221534

- 23-450

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. 152296

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


- 23-450

Good products and fast shipping. Thank you! 129432

- 23-450

Perfect thank you !!! 35500


Ask the Experts about this Dexter Axle Accessories and Parts

  • Are there 12 x 3-3/8 Inch Electric Trailer Brakes
    Like you said we have 12-1/4 x 3-3/8 inch brakes but no 12 x 3-3/8 inch brakes. When measuring though measure the inside diameter of the drum and not the diameter of the brakes. I have included a picture showing what I mean. If you measure the drum and get 12-1/4 inches then you can use 12-1/4 x 3-3/8 inch brakes such as # 23-450. But if you are measuring the inner diameter of the drum and are getting 12 inches then we will not have brakes that match the specs you need.
    view full answer...
  • Replacement Electric Brakes Needed on a Kaufman Car Hauler with 10000 lb Axles
    Since your trailer was made in 2008, the trailer manufacturer should be able to tell you the exact brand and part numbers for replacement brakes. It appears there were two Kaufman trailer companies, one in Texas and one in North Carolina. The company in Texas closed, so it would be difficult to get specific information from them. I spoke with Kaufman trailers in North Carolina, however, they said they do not have any trailers with a TL designation. There should be an identification plate...
    view full answer...
  • 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...
  • How to Determine The Axle Weight Capacity On A 20 Foot Stock Trailer
    The trailer will have a plate or sticker on it that will list the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that will list the weight capacity. You can also tell the weight capacity of the axle by measuring the diameter of the axle. A 3,500-lb. axle will have a diameter of 2-3/8 inches and a 6,000-lb. to 7,200-lb. axle will have a diameter of 3 inches. I am sending a link to an FAQ page on...
    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...
  • Can Electric Brakes Be Used On Boat Trailer
    In the past it was never recommended to use electric brakes on a boat trailer because electricity and water do not work well together, but more and more people and boat trailer companies are switching. We still recommend disconnecting the trailer wiring from the tow vehicle before backing the boat trailer into water. You will need to remove your brake lines and then install wiring for the brakes. You will want to make sure you seal all electrical connections to keep moisture out. I...
    view full answer...
  • Replacement Bearings and Seal for Dexter 10k Trailer Hub
    The bearings you need are # 387A for the inner bearing, # 25580 for the outer bearing, and for the seal # 10-51 since we know you have a 10k Dexter axle. For brake assemblies you'd need the part # 23-450 for the left hand side and part # 23-451 for the right hand side. For a hub you'd need # 8-430-5UC3.
    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...
  • Hub and Electric Brakes for Dexter SLR D90 9000-lb-Rated Axle
    Thank you for the photo of the brake assembly from your Dexter SLR D-90 9K axle. The correct hub you need for your Dexter D-90 axle is the part # 8-430-5UC3 which includes bearings, races, oil seal, oil cap, wheel bolts, and lug nuts. With this hub you can use Kodiak Synthetic Bearing Oil # XLPROLUBE. For brake assemblies you can use part # 23-451 for the right side brakes and part # 23-450 for the left side.
    view full answer...
  • 12-1/4 x 3-3/8 Inch Electric Trailer Brakes for 9K and 10K Trailer Axles
    There are 2 different sets of 12-1/4 x 3-3/8 inch brake assemblies and the difference between them is the mounting patterns they have. Electric brakes # 23-450 and # 23-451 will bolt to either a 5-hole or 7-hole mounting flange and they are for 9K to 10K axles which is what the hub # 9-44-1 is for. Electric brakes # 23-434 and # 23-435 will bolt to a 4-hole flange. So if you look at the flange your brakes are mounted to now and see just 4 holes in a square pattern you would use...
    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...
  • 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...
    view full answer...
  • Need Brake Assembly For Dexter Trailer Hub And Drum - 8,000 lbs Axles - 8 on 6-1/2, # 8-218-9,
    You mentioned a 12-1/2 inch drum, but Dexter only list a 12-1/4 inch X 3-3/8 inch drum. The parts that I am recommending are for the Dexter Hub and Drum, # 8-218-9, which is the 12-1/4 inch X 3-3/8 inch drum. I have the complete brake assemblies for the Dexter Trailer Hub and Drum - 8,000 lbs Axles - 8 on 6-1/2, # 8-218-9. The complete assemblies would contain the magnets, actuating arms, brake shoes and springs and cast backing plate. If you have the 4 bolt flange the brake assemblies...
    view full answer...
  • Replacement Brake Assemblies and Hubs for a Dexter Axle SLR D-90
    The correct hubs you would need for your Dexter D-90 axle is the part # 8-430-5UC3. The D-90 in your axle number designates is a 9k axle. For assemblies you would need part # 23-451 for the right hand side and part # 23-450 for the left hand side.
    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...
    view full answer...
  • 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...
    view full answer...
  • Is the Dexter Electric Trailer Brake Assembly # 23-451 Made in the USA.
    Yes, the Dexter Electric, Right Hand Side, Trailer Brake Assembly, # 23-451, is manufactured by Dexter in the USA. For the left hand side trailer brake assembly and hardware, you will need part numbers # 23-450, # 7-5, # 38N, and # 38LW.
    view full answer...
  • Replacement Electric Drum Trailer Brakes for a 10,000 Pound Wells Cargo Trailer
    The brakes on your Wells Cargo trailer could just be in need of adjustment. On drum brakes you will adjust the brakes so that there is a slight but constant drag of the pads on the drum when you turn the wheel. 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. If the trailer has 2 axles then you likely have de-rated 6K axles (5200 pound axles). This size would be 12x2 inches. they mount to a 5-hole mounting...
    view full answer...
  • Hydraulic Drum Brake to Electric Drum Brake Conversion for Gooseneck Trailer w/ 10,000 LB Axles
    Yes, you can convert the hydraulic drum brakes to electric drum brakes on your gooseneck trailer. I have included the link to all of our electric brake assemblies for a 10,000 lb axle. Just use the filters on the page to see if we have one that will work for you. I do recommend replacing your hub/drum assembly as well because not all hub/drum assemblies will work with both hydraulic and electric brake assemblies. We only offer one option for a 10,000 lb axle and that is part # 8-430-5UC3....
    view full answer...
  • 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...
  • Width of Brake Pads on 28 Foot Gooseneck Trailer With Dexter 10K Axles
    To determine which brake assembly you need, measure the width of your brake linings, as shown in the photo I edited for you. If your existing brake shoes measure 4 inches wide, the # 23-438 you mentioned would be an example of a good replacement for you if your existing brake assemblies use 7 mounting bolts (some use 4) and the diameter of the assembly is 12-1/4 inches in diameter when measured from the outside of one brake shoe directly across to the outside of the other shoe as shown...
    view full answer...
  • Availability of Brake Installation Kit with Spindles
    Changing spindles on a trailer axle requires specialized jigs and is best left to a qualified experienced welder. Any deviations from perfect concentricity of the spindle and brake flange will result in bad performance and/or damage to the components. If you have the equipment and skills to do this that's great, but if not I urge you not take that on yourself. We do not offer kits with just spindles, brake assemblies and hubs, but we do sell axles with hubs, brakes, bearings, seals etc....
    view full answer...

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