Dexter Electric Brake Assembly Lowest Prices for the best Trailer Brakes from Dexter. Dexter Electric Brake Assembly, LH 12-1/4" x 3-3/8" part number 23-434 can be ordered online at or call 800-298-8924 for expert service.

Select Your Vehicle

Trailer Brakes > Electric Drum Brakes > Brake Assemblies > 12-1/4 x 3-3/8 Inch > 8000 lbs Axle, 9000 lbs Axle > Left Hand Side > Self Adjust > Dexter

Dexter Electric Brake Assembly, LH 12-1/4" x 3-3/8"

Dexter Trailer Brakes

Code:   23-434


Shipping Special

Shipping Weight: 21 pounds


Dexter Trailer Brakes - 23-434

Dexter Electric Brake Assembly


  • 12-1/4" x 3-3/8"
  • Left Hand
  • For use on 8K and 9K axles
  • Self-adjusting design keeps shoes properly aligned for longer-lasting brake that requires less maintenance
    • No manual adjustments required
  • 4 Bolt
  • Axle bore diameter: 3-7/8"
  • Mounting bolts sold separately

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

Video of Dexter Electric Brake Assembly, LH 12-1/4" x 3-3/8"

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

Video Demo Dexter Trailer Brakes 23 434
Dexter 12-1/4" x 3-3/8" Left Hand Electric Trailer Brakes Review

Video Transcript for Dexter 12-1/4" x 3-3/8" Left Hand Electric Trailer Brakes Review

Today, we're going to show you Dexter Self-Adjusting Electric Brake Assembly for Left-Hand Side, part number 23-434. This is a 12-1/4" by 3-3/8" brake assembly. We'll measure the diameter across the shoes and there is 12-1/4". And we'll measure the width of the shoes and there is 3-3/8". When paired up with the right-hand side brake assembly, these brakes are good for use on trailer axles rated at 8,000 or 9,000 pounds. It uses a 4 bolt mounting pattern.

So you want to check your axle to make sure these will fit. There is a pair of wire leads that you use for your electrical connections. It doesn't matter which one you use for ground and which one you use for your power feed just as long as you have a good electrical connection. This is a self-adjusting system, meaning that when you first install the brakes, you will need to manually adjust them and set the proper tension. You'll adjust enough when there is an even amount of light drag all the way around the hub.

Once you have set up the first time, every time you back up the trailer with the brakes applied, this cable will be pulled and if some slightness is to be taken out, the star wheel will automatically be advanced. This is an electric brake assembly. So you want to make sure not to use it on boat or marine trailer applications. The way the assembly works, as the wheel and hub is spinning around and you apply brakes inside the vehicle, this magnet will be activated that will attach to the hub drum inside. As the hub drum drags on the magnet, you'll pull this arm, which in turn opens up the brake shoes and applies pressure.

We know that this is for left-hand side. We have the short shoe that needs to face the further trailer and the long shoe that will need to face towards the back. And that does it for the Dexter Self-Adjusting Electric Brake Assembly for Left-Hand Side, part number 23-434.


Ask the Experts about this Dexter Trailer Brakes
Do you have a question about this Trailer Brakes?

  • Availability of Electric Brake Drum Assembly for # 8-285-11 Dexter Trailer Hub and Drum
  • The Dexter Trailer Hub & Drum Assembly, part # 8-285-11UC3, that you have referenced, is the # 8-285-11 hub and integrated drum with the bearings, races, seal, cap, and lug nuts for a Dexter 8,000-lb axle. The electric brake drum assembly that fits the 8-285 hub and integrated drum would be the Dexter Electric Brake Assembly-Left Hand, part # 23-434, for the left side and Dexter Electric Brake Assembly-Right Hand, part # 23-435. These brake assemblies are for use on 8,000-lb and 9,000-lb...
    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...

  • Trailer Brake Assemblies for 12 X 3-3/8 inch Brakes with 4 Mounting Holes on a 1991 Kountry Aire
  • I checked with my contact at our supplier and found that the axles on your trailer are one of two brands. With the 4 bolt pattern they are either Hayes/AL-KO, 8,000 lb. axles with 12 by 3-3/8 inch brake assemblies or they are Dexter 10,000 lb. axles with 12-1/4 by 3-3/8 inch brake assemblies. If your brake assemblies are the 12-1/4 by 3-3/8 inch assemblies and you have the Dexter 10,000 lb. axles then you can use the # 23-434 and # 23-435 assemblies to replace your trailer brake assemblies....
    view full answer...

  • Brake Assembly Recommendation for a 1983 Hayes Axle with a 9,000 lb Capacity
  • The Hayes/AL-KO 12 inch Electric Brake Assembly # 185100 that you referenced is designed to fit on the standard 4 bolt pattern for brake assemblies and should bolt right up to your 1983 Hayes axle as long as it also is the standard 4 bolt pattern. Magnets do come in various sizes and varying strengths. It is recommended that you replace brake assemblies in pairs so that you have even braking on both sides. Since you have 9,000 lb axles you may be interested in purchasing brake assemblies...
    view full answer...

  • Replacement Hub and Electric Brakes for Older Camper
  • I was not able to find any Dexter part with the reference 21-17 but part # BP08-155 is a Dexter replacement electric trailer brake adjustment spring for right and left brakes assemblies # 23-435 and # 23-434. These self-adjusting 4-bolt electric drum brakes assemblies are for 8K and 9K axles. These brakes measure 12-1/4-inches x 3-3/8-inches. Parts # 23-105 and # 23-106 are 12 x 2-inch 5-bolt electric brake assemblies that are intended for 6000-lb axles. We do offer replacement brake...
    view full answer...

Info for this part was:

Photos by:
Theodore B

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.

Stay Connected

Subscribe to email newsletter


privacy - we don't send unsolicited email reviews

All images, layout and content copyright