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  6. 12-1/4 x 4 Inch Drum
Dexter Electric Trailer Brake Assembly - Self-Adjusting - 12-1/4" - Left Hand - 10,000 lbs

Dexter Electric Trailer Brake Assembly - Self-Adjusting - 12-1/4" - Left Hand - 10,000 lbs

Item # 23-438
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Dexter Axle Accessories and Parts - 23-438
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12-1/4" x 4" Driver's-side electric trailer brake assembly fits 10,000-lb axles. Mounting flange has 7-bolt pattern. Self-adjusting brakes require little maintenance. Fits 15" or larger wheels. 1-800-496-5010 to order Dexter Axle accessories and parts part number 23-438 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 - 10,000 lbs. Accessories and Parts reviews from real customers.
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Dexter Axle Accessories and Parts - 23-438

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

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


Features:

  • 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


Specs:

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


K23-438-00 Dexter Electric Brake Assembly, LH 12-1/4" x 4" - Self Adjust - 10,000 lbs

Replaces 23-438






Customer Reviews

Dexter Electric Trailer Brake Assembly - Self-Adjusting - 12-1/4" - Left Hand - 10,000 lbs - 23-438

Average Customer Rating:  5.0 out of 5 stars   (3 Customer Reviews)

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

by:

Website was very easy, (with no attitude from the no nothing parts man) received order in 2 days and for less money than locally.




by:




by:



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See what our Experts say about this Dexter Axle Accessories and Parts



  • How to Determine if a Hub Was Originally Designed as an Oil Bath or Grease Hub
    An easy way to tell if your hubs were originally oil filled or packed with grease is to remove the cap of the hub. Typically, if it is a press-in cap it is a grease hub, and if it is a screw-in cap it is an oil bath hub. Not only do semi trailers use oil bath hubs, there are many heavy duty trailers that will use them as well. If you have been putting grease in your hub so far and it has been working well for you, then I would just stay with the grease. I attached an FAQ article on lubricating...
    view full answer...
  • How to Tell if Trailer Drum Brake Assemblies are On the Right Side
    If you pull of the hubs on your trailer you should see the actuating arm holding the magnet below the spindle. If you imagine the arm as the end of an arrow it should be pointing towards the front of the trailer. If yours are on the wrong sides they would perform like you described.
    view full answer...
  • Adjusting Dexter 10K Electric Trailer Brakes
    The Dexter 10K electric brakes # 23-439 (right side) and # 23-438 (left side) will have to be manually adjusted using the adjustment wheel below the magnet. To adjust the brakes you will use a small screwdriver or similar tool to turn the adjustment wheel. The wheel pushes out the shoes. You will keep turning the wheel until the pads lightly, but consistently, drag on the drum. The brakes should be adjusted like this anytime you notice braking starting to weaken. I have included a link...
    view full answer...
  • Will Dexter 12-1/4 x 4-Inch Left-Hand Electric Brake # 23-438 Fir 10K Dexter Axle D1012
    The brake assembly you referenced, Dexter 12-1/4 x 4-Inch Left-Hand Electric Brake # 23-438, is indeed rated for 10K axles. This brake matches up to Right-Hand brake # 23-439. You can check for fit on your existing axle's brake flanges by checking the mounting bolt pattern. Both of these brakes use a 7-bolt mounting pattern. As long as your drums are 12-1/4 x 4-inches and your brake flanges use the 7-bolt mounting pattern these will work great as replacements.
    view full answer...
  • Electric Brake Assembly For Tandem 10k Dexter Axles
    For your tandem Dexter 10,000 pound axles, you will want to use the Dexter Electric Trailer Brake Assembly # 23-438 for the left hand assembly, and the Dexter Electric Trailer Brake Assembly # 23-439 for the right hand assembly. These are self adjusting brakes that require little maintenance.
    view full answer...
  • How To Adjust Dexter Electric Trailer Brake Assembly
    The Dexter Electric Trailer Brake Assembly, # 23-438 (left side) # 23-439 (right side) when first installed require manual adjustment. Simply use a small screwdriver or similar tool to turn the adjustment wheel to push out the shoes. You will keep turning the wheel until the pads lightly, but consistently, drag on the drum. I've linked a video below, you can jump to the 4:40 mark for adjustment.
    view full answer...
  • Will Dexter 12-1/4" x 4" Brakes Fit in Place of Old Brakes with Stamped Backing Plate
    Provided that your existing brakes are 12-1/4" x 4" and use the same 7-bolt mounting pattern then you can use Dexter Electric Trailer Brake Kit # 23-438-439. I have included a link to a video review of this kit for you.
    view full answer...
  • Availability of 10,000 lb Axle Dexter Trailer Brake Assemblies
    The only option we have for 10k axle rated Dexter electric brake assemblies is the part # 23-438-439 that you referenced. 10k trailer axles with drum brakes just aren't as popular as other options so there isn't as much competition for this size.
    view full answer...
  • How To Adjust And Test Electric Brakes On A Trailer
    It sounds like you need to adjust the brake on your trailer. If you have electric brakes like the Dexter Electric Brake Assembly LH, part # 23-438, you can make the adjustments pretty easily. I have attached a video that shows trailer brakes being installed. If you go to about the 4:40 mark on the video it shows how to adjust the brakes. I have also attached a photo of an electric brake that shows where the adjustment wheel is located. You can also test the magnet on the brake that is...
    view full answer...
    Image 1 for
  • Replacement Brake Assemblies for Trailer with Dexter 10k Axles
    If you can measure the width of your current brake assembly pads I can get you the correct brake assembly set for your Dexter 10,000 lb axles. If the pads are 3-3/8 inches wide you'd want the part # 23-450-451 or if they are 4 inches wide you'd want the part # 23-438-439. I tried looking up the numbers on the tag you sent a picture of and was not able to find anything.
    view full answer...
    Image 1 for
  • Replacement Brake Assemblies for Rockwell 10k Trailer Axle
    Rockwell trailer axles use standard trailer brake components so yes a 10k Dexter brake assembly like the Dexter Electric Brake Kit - Self-Adjusting - 12-1/4" - Left/Right Hand Assemblies - 9K to 10K # 23-450-451 if your hubs are 12-1/4 by 3-3/8 inches. If your hubs are the 4 inch width, then you will use the Dexter Electric Trailer Brake Kit # 23-438-439.
    view full answer...
  • Left & Right 10,000 lb Self-Adjusting Dexter Electric Brake Assemblies
    Yes, the part you mentioned is indeed an electric brake assembly, the 10,000 lb self-adjust Dexter brake assembly. That is the left hand side (driver's side), and the following are the part numbers for the left and right side assemblies: - Left Hand (Driver's) Side: Dexter Electric Trailer Brake Assembly - Self-Adjusting - 10,000 lbs # 23-438 - Right Hand (Passenger's) Side: Dexter Electric Trailer Brake Assembly - Self-Adjusting - 10,000 lbs # 23-439 To mount these you will need the...
    view full answer...
  • Servicing Electric Trailer Brakes on a Tandem Axle Trailer with 10,000 Pound Axles
    I have included 3 videos that will help you. One specifically is on installing electric brakes. The trailer in that video did not start with brakes so it will be a little different. However it will still show you how to remove the hub and adjusting the brakes. I have all included a video just on installing a hub. And finally I have included a video on bearings that should be very helpful. Some tips that I will add is to make sure that you clean off all of the old grease and use new grease...
    view full answer...
  • Brake Assembly for Dexter 10k Axle with 12 1/4 x 4 Brakes
    I have a solution for you but part # AKEBRK-10 is not what you are looking for. Instead the Dexter Electric Trailer Brake Kit Left/Right Hand Assemblies part # 23-438-439 is the set you need. The others are just a little too narrow for your application.
    view full answer...
  • Trailer Brake Magnets for Dexter 10k Axles
    Not all trailer brake magnets are the same, but since we know you have a Dexter 10,000 lb trailer axle the correct magnets would be the part # BP01-301 which would be correct for the brake assemblies # 23-438 and # 23-439.
    view full answer...
  • Replacement 12-1/4 x 4 Inch Brakes for 10,000 Pound Dexter Trailer Axles
    If your drums are 4 inches wide where the brake shoe pad makes contact with the inside of the drum then you will need 12-1/4 by 4 inch brakes # 23-438 for the left and # 23-439 for the right. If you are measuring the overall depth of the drum then you likely need the 12-1/4 by 3-3/8 assemblies such as # AKEBRK-10L which would fit on Dexter axles.
    view full answer...
  • Brake Assemblies for Dexter 10k Trailer Axles of 1999 Eager Beaver
    Is there a capacity listed anywhere on the axle? I can give Dexter the serial number of your axle but it may take a couple days and if you could get me the diameter of your axles or the capacity I could much quicker get you what you need.
    view full answer...
  • Two Year Old Big Horn 3670RL 5th Wheel Trailer Leaking Grease into All Four Brake Assemblies.
    If all four wheels on your 2-year-old Big Horn 5th wheel trailer have suddenly leaked wheel bearing grease into the brake assemblies my initial thought is that perhaps the bearings have recently been re-packed (which is typically to be done at 6 or 12 month intervals depending on manufacturer) with either too much grease or with grease of an incorrect grade. While there are general-purpose grease products that can be used in multiple applications, wheel bearings usually require a grease...
    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...
    Image 1 for
  • 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...
    Image 1 for
  • Replacement Drum Brakes Assembly for 10,000 lb Dexter Axle
    We have drum brake assemblies for your 10K Dexter axles. If you want the electric assemblies, we have the Dexter Electric Brake Kit - Self-Adjusting - 12-1/4" - Left/Right Hand Assemblies - 9K to 10K # 23-450-451 if your hubs are 12-1/4 by 3-3/8 inches. If your hubs are the 4 inch width, then you will use the Dexter Electric Trailer Brake Kit # 23-438-439. If you have hydraulic brakes we have the following: # 23-410-411 for 12-1/4 x 3-3/8 inch drum # K23-524-00-2 for 12-1/4 x 3-1/2...
    view full answer...
  • Bearings, Seal, & Electric Brakes For Big Tex 22GN 35+5 Gooseneck Trailer
    I was able to find the correct electric brakes, as well as oil seal (which is what I assume you were referring to by wheel seal), and also the bearings for your Big Tex 22GN 35+5 gooseneck trailer. I'll go ahead and list out the parts for you below. - Oil Seal # 10-56 - Replacement Trailer Hub Bearing # 395S & Race # 394A - Replacement Trailer Hub Bearing # 387A & Race # 382A - Dexter Electric Trailer Brake Assembly - Left Hand # 23-438 & Right Hand # 23-439
    view full answer...
  • Parts Needed to Replace Grease Lube Hubs with Oil Bath Hubs
    You will not need to replace the brakes on your trailer when converting from grease lube hubs to oil bath hubs. The oil bath hubs that you choose should come with the proper bearings, seal and oil cap for that hub. You will want to check the part numbers on your bearings and seals to ensure you select the correct hubs for your spindles. We carry two oil bath hub and drum assemblies. Trailer Hub and Drum Assembly, # 8-219-9UC3-A, fits 5,200 lb to 7,000 lb axles with spindles that require...
    view full answer...
  • Electric Drum Brakes for 10K Axle Conversion from Hydraulic Brakes
    Your choice of electric drum brakes to replace your hydraulics will be based on axle weight capacity. We do have electric brakes rated for 10K axles and these have the same 12-1/4 x 4 dimensions as your current hydraulics. You can see all of these electric brakes on the linked page. For example, Dexter Self-Adjusting brake set # 23-438-439 uses the same 7-bolt mounting pattern as the item you referenced, # AKEBRK-10R, but will properly fit your drums. These brakes work with wheels sizes...
    view full answer...


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Info for this part was:

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