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Dexter Electric Brake Assembly w/ Cast Backing - Self-Adjusting - 12-1/4" - Left Hand - 15K

Dexter Electric Brake Assembly w/ Cast Backing - Self-Adjusting - 12-1/4" - Left Hand - 15K

Item # 23-446
Our Price: $371.56
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Shipping Weight: 21 lbs
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Dexter Trailer Brakes - 23-446
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12-1/4" x 5" Driver's-side brake fits 15,000-lb axles. Mounting flange has a 7-bolt pattern. Self-adjusting brakes require little maintenance. Cast backing plate is durable. Fits 15" or larger wheels. 1-800-940-8924 to order Dexter accessories and parts part number 23-446 or order online at Free expert support on all Dexter products. Great prices and Fastest Shipping for Dexter Electric Brake Assembly w/ Cast Backing - Self-Adjusting - 12-1/4" - Left Hand - 15K. Accessories and Parts reviews from real customers.
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  • Reviews (3)
  • Q & A (0)
  • Videos (1)
  • Photos

Dexter Accessories and Parts - 23-446

  • Trailer Brakes
  • Electric Drum Brakes
  • Brake Assembly
  • 12-1/4 x 5 Inch Drum
  • Dexter
  • LH
  • 15000 lbs
  • Self Adjust

12-1/4" x 5" Driver's-side brake fits 15,000-lb axles. Mounting flange has a 7-bolt pattern. Self-adjusting brakes require little maintenance. Cast backing plate is durable. 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
  • Cast backing plate is durable and long-lasting
  • 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 5" wide
  • Mounting flange bolt pattern: 7 bolt
  • Wheel size: 15" or larger
  • Axle rating: 15,000 lbs
  • Limited 5-year warranty

K23-446-00 Dexter Electric Brake Assembly, LH 12-1/4" x 5" - Self Adjust - 15,000 lbs - Cast Back Plate

Replaces 188830 and 23-446

Video of Dexter Electric Brake Assembly w/ Cast Backing - Self-Adjusting - 12-1/4" - Left Hand - 15K

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

Video Transcript for Dexter Axle Trailer Brakes 23-446 Review

Today we're going to take a look at the Dexter 12-1/4-inch left hand electric brake assembly. This is for a 15,000-pound axle. Now, electric brakes will require only an electric brake controller. We do sell those separately on our website. There is no actuator hydraulic lines necessary with electric brakes. This brake assembly uses the forward self-adjust feature and you can tell by looking at, there is a cable here that goes around the pulley and attaches to the lever on the adjustment gear.

This is a self-adjusting brake which does not require periodic manual adjustment like standard brakes. When you're going forward it will automatically adjust your brakes for you. Now, this one uses a durable cast backing plate. The configuration on this assembly is left hand, driver's side, and the way to tell that . Now, on a new assembly it will always have a sticker that you can go by but if the sticker wasn't there, the easiest way is just look at the length of the pad on the shoes. This one goes from here to here and the pad on the other shoe goes all the way from here to here.

This is the longer pad and this is the shorter pad. The shorter pad is the primary shoe and that will always face the front of the trailer so that'll tell you that this is a left hand, driver side, assembly. Now, the sizing on the brake assembly, this is a 12-1/4 inch by 5 inch. That measurement they get from the diameter, the 12-1/4 will be measured here to here. If we put a ruler edge-to-edge, 12-1/4 inches. The 5 inches would be the width on the brake pad itself, from here to here.

If we put the ruler on there, you can see right at 5 inches, so 12-1/4 by 5 inches. Now, this brake assembly does use a seven-bolt mounting flange. You can see the seven holes right here and that would attach to a weven-bolt brake mounting flange on your axle. Now, the mounting bolts to install this, we do sell those separately on our website. This is designed for axles up to 15,000 pounds and these are electric brakes so you'll notice in the rear .. Turn this around ...

there's two wires coming out the back so they do need to be connected to power and grounded. They are both blue wires so it doesn't matter which one is which. One will go to the ground. The other will go to the brake feed. That should do it for the review on the Dexter 12-1/4-inch left hand electric brake assembly for 15,000-pound axles.

Customer Satisfaction Score:

Customer Reviews

Dexter Electric Brake Assembly w/ Cast Backing - Self-Adjusting - 12-1/4" - Left Hand - 15K - 23-446

Average Customer Rating:  4.7 out of 5 stars   (3 Customer Reviews)

12-1/4" x 5" Driver's-side brake fits 15,000-lb axles. Mounting flange has a 7-bolt pattern. Self-adjusting brakes require little maintenance. Cast backing plate is durable. Fits 15" or larger wheels.


e trailer is always saving me recommend to any one great service always.


Angie was a great help in finding what I needed


Great product, great pricing. Ordered parts Wednesday morning and had them Thursday morning for F R E E. Thanks for being so easy to work with!


See what our Experts say about this Dexter Accessories and Parts

  • Trailer Brake Assemblies are Upside Down and on the Wrong Sides of the Axles
    No problem, we can get this sorted out. The first thing I want you to look at are the centers of the axles. Round trailer axles have a bow in them so the centers of the axles should be higher than the ends. When weight is put on them they straighten out. That is part of how they get their capacity. If the axles on your trailer are upside down then the bows would be pointed down. It is possible the previous owner literally flipped the axles and that could be why the brakes are upside down...
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  • Is There a Way to Tell Difference Between 12k and 15k Trailer Brake Assemblies
    12k trailer brake assemblies like the part # 23-442-443 and 15 assemblies like part # 23-446-447 can both be 12-1/4 inch by 5 inch and use the same 7 bolt mounting pattern so dimensionally it's hard to say. I would look for part numbers on your assemblies to see if you can determine it that way or you could look on the axle for a capacity listed. The big difference between the two will be magnet sensitivity as the higher rated assemblies will need a magnet that grabs a little harder....
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  • Parts Needed to Convert Dexter 15k Air Brakes to Electric Brakes
    What you'd need to convert your 15k Dexter air brakes to electric brakes is just new electric brake assemblies part # 23-446-447 to replace the air brake assemblies you have now. I checked with Dexter and the drum you have now will work fine with these assembly replacement. You'd be able to pull off all of the air brake components you have now and replace everything with basically just wires that lead back to the brake drum magnets with 10 gauge wire like part # 10-1-1 which is sold by the foot.
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  • Replacement Brakes For Gooseneck Trailer With Heavy Axles
    The largest set of brakes we will have is for a 15K axle. We have two options, the Dexter Electric Brake Kit, # 23-446-447 for 15K axles with 12-1/4 x 5 Inch Drums.
    view full answer...
  • Replacement 12-1/4 x 5 Brake Assemblies For a 15,000LB Dexter Axle
    Currently Dexter only offers 12-1/4" x 5" brakes with a 7-Bolt mounting flange. I do see Dexter does offer a mounting flange 004-048-00 which you can get to update your axle to the 7 bolt flange. We currently do not carry this but it will allow you to use either their Electric # 23-446-447 or Hydraulic # 23-406-407 brake assemblies.
    view full answer...
  • Is Dexter 12-1/4 x 5 Brake Assembly # 23-446 Compatible with Dexter Hub/Drum Assembly # 8-285-11UC3
    I did not find any purchase history for you but the electric drum brake that you referenced, Dexter # 23-446, is a left-hand 12-1/4 x 5-inch-wide brake. Its matching right-hand part is # 23-447. The hub/drum you referenced, Dexter part # 8-285-11UC3, is a 12-1/4 diameter x 3-3/8-inch-wide hub. These parts do not work together. The brake is rated for 15,000-lb axles while the hub/drum is rated for 8000-lb axles. Both their sizes and weight ratings are incompatible with each other. You will...
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  • Replacement Brake Assemblies and Hub/Drums for 15k Dexter Axle
    Is the battery of the breakaway kit charged? Does your tow vehicle have a brake controller installed?
    view full answer...
  • Parts Needed To Convert Electric Over Hydraulic To Electric Brakes On Dexter 15,000LB Axle
    To confirm that the Dexter Electric Brake Kit # 23-446-447 will operate properly on your Dexter 15,000lb axle you will need to confirm that your hub is compatible with electric brakes. The Dexter Trailer Hub and Drum Assembly # DX78QR for a 15,000lb axle, you can see the smooth surface inside the drum where the mounting bolts are that confirms it will work with electric brakes. The only other parts you will need is some 12 Gauge Wire # 12-1-1 to run from the 7-way connector to the brakes...
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  • Electric Brake Conversion from Air Brakes on 15,000 lb Axle Trailer
    The Dexter Electric Brake Kit w/ Cast Backing - Self-Adjusting - 12-1/4" - Left/Right Hand - 15K # 23-446-447 will fit any 15K axle that have the standard 7 bolt mounting flange. These are self-adjusting brakes so there is no need for manual adjustments after the initial installation. They are labeled left-hand (driver's side) and right-hand (passenger's side) to ensure proper placement. If you need the mounting hardware, I recommend # BRKH122510 for each axle. You will also need...
    view full answer...

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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C

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