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  1. Trailer Brakes
  2. Dexter
  3. Electric Drum Brakes
  4. 8000 lbs Axle
  5. 12-1/4 x 3-3/8 Inch Drum
  6. 16 Inch Wheel
  7. 16-1/2 Inch Wheel
  8. 17 Inch Wheel
  9. 17-1/2 Inch Wheel
Dexter Electric Trailer Brake Kit - Self-Adjusting - 12-1/4" - Left/Right Hand - 8K

Dexter Electric Trailer Brake Kit - Self-Adjusting - 12-1/4" - Left/Right Hand - 8K

Item # 23-434-435
Our Price: $750.41
Trailer Brakes
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Shipping Weight: 40 lbs
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Dexter Electric Trailer Brake Kit - Self-Adjusting - 12-1/4" - Left/Right Hand - 8K 12-1/4 x 3-3/8 Inch Drum 23-434-435
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12-1/4" x 3-3/8" Driver's-side and passenger's-side electric brakes fit 8,000-lb axles. Mounting flanges have a 4-bolt pattern. Self-adjusting brakes require little maintenance. Fit 16" or larger wheels. Great Prices for the best trailer brakes from Dexter. Dexter Electric Trailer Brake Kit - Self-Adjusting - 12-1/4" - Left/Right Hand - 8K part number 23-434-435 can be ordered online at or call 1-800-940-8924 for expert service.
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Dexter Trailer Brakes - 23-434-435

  • Electric Drum Brakes
  • 8000 lbs Axle
  • 12-1/4 x 3-3/8 Inch Drum
  • 16 Inch Wheel
  • 16-1/2 Inch Wheel
  • 17 Inch Wheel
  • 17-1/2 Inch Wheel
  • Boat Trailer
  • Camper
  • Car Hauler
  • Snow Trailer
  • Utility Trailer
  • Self Adjust
  • Dexter

12-1/4" x 3-3/8" Driver's-side and passenger's-side electric brakes fit 8,000-lb axles. Mounting flanges have a 4-bolt pattern. Self-adjusting brakes require little maintenance. Fit 16" or larger wheels.


  • Electric brakes are easier to install and offer more user control than hydraulic brakes
    • Require 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
  • Left-hand (driver's-side) brake assembly and right-hand (passenger's-side) brake assembly included
    • Mounting bolts and hardware sold separately
  • Made in the USA


  • Dimensions: 12-1/4" diameter x 3-3/8" wide
  • Mounting flange bolt pattern: 4 bolt
  • Wheel size: 16" or larger
    • Compatible with 12-1/4" hub/drums
  • Axle rating: 8,000 lbs

23-434 Dexter Electric Brake Assembly, LH 12-1/4" x 3-3/8" - Self Adjust - 8K

23-435 Dexter Electric Brake Assembly, RH 12-1/4" x 3-3/8" - Self Adjust - 8K

Customer Satisfaction Score:

Customer Reviews

Dexter Electric Trailer Brake Kit - Self-Adjusting - 12-1/4" - Left/Right Hand - 8K - 23-434-435

Average Customer Rating:  4.8 out of 5 stars   (11 Customer Reviews)

12-1/4" x 3-3/8" Driver's-side and passenger's-side electric brakes fit 8,000-lb axles. Mounting flanges have a 4-bolt pattern. Self-adjusting brakes require little maintenance. Fit 16" or larger wheels.


Fit like a glove. Easy to install. Have good braking power restored.


These were delivered quickly and well packaged. Price point was fair.

So far a year after install, the brakes are working flawlessly!
Damian - 06/14/2022


Everything showed up in two days


Nicole was a great help. I received the correct parts.


Original parts were wrong. Talked with Tara and she fixed the problem. Thank you for taking care of the issue.




Fit the 4 bolt flange great





See what our Experts say about this Dexter Trailer Brakes

  • Recommended Electric Brake Assemblies for Lippert 8,000 Axle
    The Dexter Electric Trailer Brake Kit # 23-434-435 referenced in your question is designed for 8,000 pound axles. As long as your existing hub drums feature a 12-1/4 inch diameter and 3-3/8 inch depth, these electric brake assemblies will work great on your Lippert axle. You will also just want to make sure that the 4 bolt mounting pattern on these assemblies matches the pattern on your existing mounting flange. Both the left hand and right hand assemblies are included. I have attached...
    view full answer...
  • Replacement Electric Brakes For Dexter 10,000LB Axle With 12-1/4" X 3-3/8" Brake Assemblies
    Dexter was able to tell me that your 10,000LB axle came with their 12-1/4"x3-3/8" Electric Trailer Brake Kit # 23-434-435. Due to the age of the axle I recommend replacing the entire assembly to ensure their are no issues with the old magnets or wiring.
    view full answer...
  • Replacement Electric Brake Assemblies For an 8,000LB Dexter Axle Manufactured In 1996
    Yes, the etrailer Electric Trailer Brake Kit # AKEBRK-8 will fit your 8,000LB Dexter Axle that was produced in 1996. I was able to confirm this with Dexter that the 12-1/4" x 3-3/8" was the only size electric brakes that were installed from the factory on axle. We also have the Dexter Electric Trailer Brake Kit # 23-434-435 if you wish to stay with original equipment.
    view full answer...
  • Electric Trailer Brake Kit for 8K Drum Brakes
    There are a pair of brake kits which are rated for 8,000 lbs which may work for you. The Electric Trailer Brake Kit w/ Dust Shields # AKEBRK-8 and Dexter Electric Trailer Brake Kit # 23-434-435 have a 4 bolt mounting flange bolt pattern, are 12-1/4" diameter x 3-3/8" wide, and are self-adjusting. These will only require the use of an electric brake controller; I've added a link to our page with each of our controllers for you. I've also added a link to a video review of the Dexter brakes...
    view full answer...
  • Is There Difference Between etrailer and Dexter 8k Trailer Brake Assembly Sets
    The value 8k etrailer brake assembly set part # AKEBRK-8 and the premium Dexter 8k set part # 23-434-435 both offer the same stopping power. The Dexter brand is widely considered to be the best brand for trailer braking components and they do work really well but the etrailer brand is not low quality by any means and with the price difference as large as it is I would say it's the easy winner.
    view full answer...
  • Do Electric Brakes Need Certain Amount of Stopping Power?
    That isn't the sort of figure that is factored into brakes. What you need to choose the right brakes is your axle's capacity, which is going to lead you in the right direction in terms of the brakes you need. For example, a 3,500 lb axle capacity would need electric brakes # AKEBRK-35-SA whereas an 8,000 lb axle would use # 23-434-435.
    view full answer...
  • Testing Trailer Magnets On A Trailer With 12" Electric Drum Brakes
    I have linked an article below on testing brake magnets for you to reference. You will need a Multimeter # PT89ZR to test the magnets in the Dexter Electric Trailer Brake Kit # 23-434-435. First you will begin by testing the output coming from the vehicle. Each magnet should see 3.2-4.0 amps of power between 12-13 volts with the brake controller set to max. This test can also be performed with a 12v battery to determine if the problem is with the brake controller or wiring and not the...
    view full answer...
  • How to Determine Correct Bearings, Seals, and Electric Brakes for Hub and Drum
    I was unable to find a reference to that axle, but there is a simple way to find out the exact replacement bearings and seals you need. Simply take apart your hub assembly and look at the bearings themselves; wipe away the grease and you should be able to see the part number stamped directly on them. If you are unable to find them, you need to use Digital Caliper # 301-17068 and measure your spindle to the thousandths of an inch where the bearings ride, as well as where the grease seal...
    view full answer...
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  • Dust Shield Cover for Dexter Electric Trailer Brake Kit 23-434-435
    The dust shield cover for the Dexter Electric Trailer Brake Kit # 23-434-435 is part # D036-115-20.
    view full answer...
  • Will 12-1/4 inch by 3-3/8 inch Brake Assemblies Replace Dexter Brand
    For your Dexter drums that take assemblies that are 12-1/4 inch by 3-3/8 inch our brand asssembly set part # AKEBRK-10 is a confirmed fit and will save you money over the Dexter kit # 23-450-451. These are both kits for 10k axles. If instead you have 8k you'd need # AKEBRK-8 for brand and # 23-434-435 for Dexter.
    view full answer...
  • Are Trailer Brakes Interchangeable Between 7k and 8k Axles
    There is a size difference between the brake assemblies that fit 7k axles and 8k axles so you would not be able to use 7k assemblies on an 8k axle. You'll have to measure your current assemblies do determine which kit you'd need: # K23-532-533-00 for 12 inch by 3-3/8 inch # DX32QR for 12 1/4 inch by 2-1/2 inch # 23-434-435 for 12-1/4 inch by 3-3/8 inch
    view full answer...
  • Electric Trailer Brakes For 12-1/4 Inch Dexter 8-285 Hub & Drum
    We do have the correct electric trailer brakes that will fit your Dexter 8-285 hub and drum, which is a 12-1/4 inch drum. You can choose from the following two options, both of which will work for you: - Electric Trailer Brake Kit with Dust Shields - Self-Adjusting # AKEBRK-8 - Dexter Electric Trailer Brake Kit - Self-Adjusting # 23-434-435 Along with these brakes, the only other thing you will need is their mounting hardware, the Mounting Bolts and Hardware for 12-1/4" Brake Assemblies...
    view full answer...
  • Replacement Brake Magnet and Spring for Dexter Electric Trailer Brake Kit (23-434/23-435)
    The only option we offer to replace the brake magnet spring on a Dexter Electric Trailer Brake Kit (23-434/23-435) part # 23-434-435 is with the Replacement Magnet part # BP01-306. We also offer the Replacement Brake Spring Kit part # K71-506-00 if you need any other springs.
    view full answer...
  • Replacement Hub Drum and Brake Parts for 8K Dexter Axles
    For 8K Dexter Axles you need the Electric Brake Kit # 23-434-435 (1 for each axle) and then 2 of the Hub and Drum Assembly # 8-285-11 for each axle. If you need to replace any wiring then that would be part # 10-1-1, sold by the foot, and heat shrink butt connectors # DW05745-10. Let me know if there is anything else in your setup that you're needing!
    view full answer...
  • Looking For Drum Brakes That Fit An 8,000 Pound Axle
    To get the correct replacement brake drums for your 8,000 pound axles, you will need a few things to be verified. The first will be if they are are hydraulic or electric brakes. If they are hydraulic, we currently have the Dexter Hydraulic Drum Brake Kit - Duo Servo - 12-1/4" - Left and Right Hand Assemblies - 8K # 23-402-403 that will measure 12-1/4 x 3-3/8 inches. This will also use a 4 bolt pattern to attach to your axle. If you have electric brakes though, you will need a few more...
    view full answer...
  • Is The Distance Between Races On Dexter Hub 8-285-11 and 8-393-6UC3-A The Same?
    I had our warehouse measure the distance between the inner and outer races of the Dexter Trailer Hub and Drum # 8-285-11 and # 8-393-6UC3-A and they found that both of them have the exact same 1-3/4" measurement, so as long as you have the # 25580 inner bearing and # 02475 outer bearing combination either hub will fit fine. You will just need to match the hub to the correct brake assemblies as the # 8-285-11 uses 12-1/4" x 3-3/8" brake assemblies # 23-434-435 where the # 8-393-6UC3-A uses...
    view full answer...
  • 8k Rated etrailer Hub/Drums that Work as Replacement for Dexter 8-285 Hub
    Yes the etrailer hub/drum # AKHD-865-8-K that you referenced would work great as a replacement for the Dexter 8-285 hub part # 8-285-10UC3-A that you also mentioned. Then for a set of brake assemblies we have the self adjusting Dexter kit part # 23-434-435 which would work great or the etrailer equivalent part # AKEBRK-8.
    view full answer...
  • Converting Hydraulic Brakes To Electric On Tri-Axle Livestock Trailer
    Most hubs are compatible with electric and hydraulic brakes. The 10,000 lb axle 12-1/4 inch diameter Dexter hub and drum assembly part # 8-430-5UC3 that we carry is hydraulic and electric brake compatible which may be what you have. If you can tell me the part number of the Dexter hubs and drums you have specifically I can find out if they are compatible. If your hubs are compatible, I recommend Dexter Electric Brake Kit part # 23-434-435. These Dexter brakes measure 12-1/4" diameter...
    view full answer...
  • Comparing Dexter Hub and Drum Assemblies 8-285-11 and 8-393-6UC3-A
    You will experience some reduced braking power when using the Dexter Trailer Hub and Drum Assembly # 8-393-6UC3-A with 12-1/4 x 2-1/2" brake assemblies compared to the # 8-285-11 with 12-1/4" x 3-3/8" brake assemblies. However there are other differences like the # 8-285-11 having 9/16" wheel studs where the # 8-393-6UC3-A has a larger 5/8" stud. Between the two I recommend going with the # 8-285-11 along with bearings # 25580 and # 02475, grease seals # RG06-070, lug nuts # 6-53, and...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Written by:
Alexander C

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