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  1. Trailer Brakes
  2. etrailer
  3. Electric Drum Brakes
  4. 12000 lbs Axle
  5. 12-1/4 x 5 Inch Drum
  6. 16 Inch Wheel
  7. 16-1/2 Inch Wheel
  8. 17 Inch Wheel
  9. 17-1/2 Inch Wheel
etrailer Electric Trailer Brakes w/ Dust Shields - Self-Adjusting - 12-1/4" - Left/Right - 12K

etrailer Electric Trailer Brakes w/ Dust Shields - Self-Adjusting - 12-1/4" - Left/Right - 12K

Item # AKEBRK-12
Our Price: $428.97
Trailer Brakes
Shipping Weight: 43 lbs
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The automotive-grade pads on these automatically adjusting brakes offer lasting effectiveness. 12-1/4" x 5" Assemblies have rust-resistant, e-coated backing plates and dust shields to protect from debris. Fits 15" or larger. Great Prices for the best trailer brakes from etrailer. etrailer Electric Trailer Brakes w/ Dust Shields - Self-Adjusting - 12-1/4" - Left/Right - 12K part number AKEBRK-12 can be ordered online at or call 1-800-940-8924 for expert service.
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etrailer by AxleTek Trailer Brakes - AKEBRK-12

  • Electric Drum Brakes
  • 12000 lbs Axle
  • 12-1/4 x 5 Inch Drum
  • 16 Inch Wheel
  • 16-1/2 Inch Wheel
  • 17 Inch Wheel
  • 17-1/2 Inch Wheel
  • Standard Grade
  • Self Adjust
  • etrailer

The automotive-grade pads on these automatically adjusting brakes offer lasting effectiveness. 12-1/4" x 5" Assemblies have rust-resistant, e-coated backing plates and dust shields to protect from debris. Fits 15" or larger.


  • Self-adjusting brakes let you maintain optimal braking power at all times
    • Ensures reliable contact between the brake shoes and drums
    • Prevents uneven wear on brake shoes
    • Allows for the perfect setting thanks to the fine-tooth star gear
  • Easier to install and gives you more control than hydraulic brakes
    • Requires only an electric brake controller (sold separately) - no actuator or hydraulic lines needed
  • Automotive-grade brake pads offer superior quality, smooth operation, and excellent braking torque
    • Fully bonded to shoes for more consistent braking compared to riveted pads
    • Tapered edges on pads minimize stuttering and brake lockup
  • Protective dust shields keep internal components free from dirt, grime, and road debris
    • E-coat on backing plates fends off rust
    • Adjuster plugs (included) cover access holes
  • Left-hand (driver's-side) and right-hand (passenger's-side) brake assemblies included
    • Mounting bolts and hardware (BRKH122510) sold separately
  • QAI , CSA , and SAE-N certifications ensure quality


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

Quick Tip: There's really not a whole lot to getting new drum brakes. If you've confirmed that all of the specs listed above line up with what you need for your trailer, you can be pretty sure these will work for you.

Automotive-Grade Brake Pads

The pads on these trailer brakes are made of the same friction material that you might find on a car's drum brakes. In fact, the material is SAE-N certified. So, not only does it provide high-performance braking, but it's environmentally friendly, too! With these brakes, your trailer will be good to go on any road throughout the United States and Canada.

The superior quality of these pads is also due to the fact that they're bonded to the shoes, not just nailed down. Riveted brake pads will always give you a screeching reminder to replace your brake shoes. That's because the rivets will scrape against your drum as the friction material wears down. You won't have that noisy problem with bonded brake pads. You'll also get a little more friction pad contact because there aren't any cutouts for rivets. And more friction means more stopping power.

A closeup shot of an etrailer drum brake shows a tapered brake pad.

These pads are also tapered, which should help to prevent any broken, crumbly bits of material from rotating inside the drum as the pads wear over time. Brakes without these tapers are more likely to create a jarring braking experience that could cause the brakes to stutter and lock up.

Self-Adjusting Brakes Don't Require Routine Maintenance

With typical electric brake assemblies, you need to manually adjust them every now and then to make sure you're getting the shortest stopping distances every time you tow.

A trailer drum brake with a red callout shows the location of a tension cable and pulley on a self-adjusting trailer brake.

With self-adjusting brakes, though, you'll always have peak stopping power - simple as that! As the brake pads wear over time, a tensioning cable will automatically keep the pads in alignment so they'll consistently make contact with your drum when you brake. You won't have to do tedious manual adjustments anymore.

Thoroughly Tested for Safety

A lot of resources have been invested to ensure that these brakes meet the requirements for certification set by the QAI and CSA . Basically, these certifications tell you that these trailer brakes are well built and safe for use on the road. They've been tested for braking performance under real-world conditions to provide the most realistic scenario for the everyday tower.

How to Break In New Brakes

Once you get these brakes installed, you'll need to break them in. First, find a long stretch of road or a big, empty parking lot. Once you're there, set your brake controller to its maximum setting and get moving. Speed up to about 40 mph and brake to slow to about 20 mph. Repeat this 15-30 times. The goal is to get the brake shoes and magnet properly seated into your drum. You'll know you've done that when it feels less jerky (and more consistent) each time you apply the brakes.

Note: The brakes will be very hot after doing this, so after every 10 stops you'll want to wait about 10 minutes to let the brakes cool off before continuing. If you don't, you might cook and crack the pad material.

B1212E-21 etrailer by AxleTek Electric Brake Assembly - LH - Driver Side - 12-1/4" x 5" - Self-Adjusting - 12,000 lbs - Dust Shield

B1212E-22 etrailer by AxleTek Electric Brake Assembly - RH - Passenger Side - 12-1/4" x 5" - Self-Adjusting - 12,000 lbs - Dust Shield

Customer Satisfaction Score:

Customer Reviews

etrailer Electric Trailer Brakes w/ Dust Shields - Self-Adjusting - 12-1/4" - Left/Right - 12K - AKEBRK-12

Average Customer Rating:  4.6 out of 5 stars   (93 Customer Reviews)

The automotive-grade pads on these automatically adjusting brakes offer lasting effectiveness. 12-1/4" x 5" Assemblies have rust-resistant, e-coated backing plates and dust shields to protect from debris. Fits 15" or larger.


Company was great to deal with and had quick shipping. Installation went smoothly and they work great!


My order came very quick just with standard shipping witch was great. Down side was it was packaged very poorly. The box wasn't heavy enough for everything inside itso was coming apart when it was dropped off. There was very little packing inside so parts were bouncing around and into each other. Two of the 4 brakes had come apart so I had to reassemble them. Luckily no parts were missing. Took me 45 minutes to reassemble them. It all needed better box and sent in multiple packages.


These brake assemblies where exactly what I was looking for. Because these are an odd size, my local supplier did not have them in stock and would have taken a week to get them and the price would have been double what I paid on etrailer
Thanks again Julie N. for you help processing my order. I got them in 3 days.


My box was open and I had to put together 1 out of the 4 assemblies before I could put it on my trailer not impressed with the shipping box and when you spend $xxx on parts you would think it would be better packaged in a box


I did a R&R. These brakes fit and work just like the original ones. Thanks etrailer.


Fits a large eeger beaver wood chipper that the dealer wanted over 900 dollars for the same thing. Etrailer always has what I need and is priced good, ships easily, and most times has it in stock.


my think is wow ! because shipping arrived quick than I expect. The brake system is fit perfect and easy install if you have hand skill then you good.

by: 06/05/2022

Feliks. T.


Working very well

Etrailer Expert

Mike L.


@FeliksT We're glad to hear that you're happy with your brake assemblies!


Brakes worked well for the first ten months are so. The only complaint I have with this system are the magnets. Within the last month are so I’ve have to replace two of the magnets due to the wires on them breaking. I just think for the price of this system there should be better wires used.


Great package I put all four on had to break them in and they work great.
Fast free shipping great price and great product thank for a fare deal and great product


Excellent product


I have 12k dexter axles and needed entire brake assemblies. Bought the etrailer brand, perfect fit! This is my new website for all my trailer needs!!


Just as described. Installation was a breeze. Have not tried out yet had to order brakes for the other axle.


Fast delivery. Great service.


Extremely satisfied


Quality product. Etrailer has always had what I need and fast shipping


Good Product, arrived quickly.



Great, They work Good.


haven't installed yet, if they are same as first 2 I ordered everything will be ok. thanks


Pricing very competitive & received before expected delivery!


Easy ordering and fast delivery. Parts installed with no problems.



Quick response, good knowledge of parts, shipped right away.




great pricing. great products. fast s hipping.


Was such a easy process and came before expected

Show More Reviews

See what our Experts say about this etrailer Trailer Brakes

  • Does it Matter Which Wire is Power or Ground For 12k Electric Trailer Brakes AKEBRK-12
    Good question and it does not matter which wire you use for power and which you use for ground when installing the Electric Trailer Brake Kit w/ Dust Shields - Self-Adjusting - 12-1/4" - Left/Right Hand - 12K # AKEBRK-12.
    view full answer...
  • Troubleshooting Trailer with One Hub That Locks Up Even with Low Power on Brake Controller
    On a trailer as large and heavy as a tandem-axle 40-footer you really do want all four hubs delivering braking force. Wheel bearing grease, or oil from an oil-bath type hub, can certainly damage drum brakes. Usually such leakage will cause reduction in braking power because the grease/oil reduces the pad-to-drum friction that provides the braking force. Grease- or oil-contaminated brake assemblies do need to be replaced; it is not really possible to clean them out properly if they actually...
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  • Replacement Brake Assemblies For 12,000LB Axle With 12-1/4" X 5" Electric Drum Brakes
    El kit de freno de remolque eléctrico # AKEBRK-12 son nuestros únicos conjuntos de freno de 12-1/4" x 5". Incluye un juego de frenos para un eje, por lo que necesitará 2 juegos para reemplazar los 4 frenos. The Electric Trailer Brake Kit # AKEBRK-12 are our only 12-1/4" x 5" brake assemblies. It includes a set of brakes for one axle, so you will need 2 sets to have all 4 brakes replaced.
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  • Center Diameter of Electric Trailer Brake Kit w/ Dust Shields
    Hello, the measurment you are looking for is 4.5" on the Electric Trailer Brake Kit w/ Dust Shields, # AKEBRK-12.
    view full answer...
  • Compatibility of etrailer Electric Brake Kit Wit 12,000LB Dexter Axles
    Yes, the Electric Trailer Brake Kit w/ Dust Shields # AKEBRK-12 will fit 12,000lb Dexter axles that mount with a 7-bolt flange. The brake pads are 12-1/4" in diameter and 5" wide.
    view full answer...
  • Are There Two Brake Assemblies in this Kit?
    Yes, the Electric Trailer Brake Kit w/ Dust Shields - Self-Adjusting - 12-1/4" - Left/Right Hand - 12K item # AKEBRK-12 includes both the left and the right side brake assemblies. You will get one set of brake assemblies with this kit that will enable you to do one axle.
    view full answer...
  • Will Electric Brakes # AKEBRK-12 Replace Dexter 12K Brakes on Trailer
    Yes, the Electric Trailer Brake Kit # AKEBRK-12 that you referenced will work perfectly on your trailer in place of the Dexter K23-443-00 (Right Hand) and K23-443-00 (Left Hand) that your manual calls for. These share the exact same 12-1/4" x 5" dimensions and 7 bolt mounting flange pattern that will fit your existing hub drums and axle. The only real difference between the two brake assemblies other than brand name is how the friction material is molded to the brake shoes...
    view full answer...
  • Matching Left and Right Side for Electric Trailer Brake Assembly AKEBRK-12R and AKEBRK-12L
    We have the matching left side of the # AKEBRK-12R with the part # AKEBRK-12L.
    view full answer...
  • What Are the Dimensions of the 7 Bolt Brake Mounting Flange
    The 7 bolt brake mounting flange that the Electric Trailer Brake with Dust Shield part # AKEBRK-12R for right hand and part # AKEBRK-12L for left hand uses is an industry standard pattern so if you have a 9,000 lb to 15,000 lb axle then it will use this same 7 bolt brake mounting flange pattern so you don't really need to measure this. I have however attached a photo of theses measurements for you. I am not sure what depth dimension that you are looking for but if you can clarify this...
    view full answer...
    Image 1 for
  • Do etrailer 12-1/4 inch Brake Assemblies Fit Dexter 12k Axles
    Yes the etrailer 12-1/4 inch brake assemblies will fit your 12k Dexter axles and are electric. For the matching left hand side you'd want the part # AKEBRK-12L.
    view full answer...
  • What are the Dimensions of the of the Mounting Holes for Part # AKEBRK-12L
    The measurements for part # AKEBRK-12L are: Inner hole where the spindle goes has a diameter of 4-7/16 inches. The mounting holes, center on center, are 2 inches apart. The top two holes in the 7 bolt pattern, center on center, are 4 inches apart.
    view full answer...
    Image 1 for
  • Dimensions of the 12K lectric Trailer Brake with Dust Shield?
    The 12,000 lbs etrailer Electric Trailer Brake with Dust Shield item # AKEBRK-12R you were looking at has an industry standard 7 bolt brake mounting flange pattern. This brake assembly measures 12-1/4" diameter x 5" wide. If your current 15k brakes match these dimensions then they will fit they just won't have the capacity or braking ability you currently have.
    view full answer...
  • Can Electric Drum Brakes Be Used on a Boat Trailer
    You ask a very good question. In recent years we've seen more and more boat trailer manufacturers installing electric drum brakes on their trailers as OEM equipment. In the past boat trailers almost always had hydraulic drum or disc brakes as standard equipment since this avoided the natural concerns about combining electricity and water. The main reasons for this shift towards electric drum brakes are their lower cost and easier installation as compared to hydraulics, and that insulating...
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  • Replacing 10K AL-KO 12-1/4 x 5 Inch Electric Brake Assemblies on Trailer
    We do have 12-1/4 x 5 inch electric drum brake assemblies available, however we have found that with higher-rated assemblies like these the AL-KO units aren't able to be easily swapped with other brands. The Electric Trailer Brake Kit # AKEBRK-12 might work well but it features a 7 bolt pattern, which likely doesn't match up to the mounting flanges on your AL-KO axles. If this is the case you will need to try and weld the brake backing plate directly to the flange for them...
    view full answer...
  • Adjusting Electric Trailer Brakes
    In order to loosen the star nut on electric brakes you can use Adjustment Spoon # W80630 you should be able to rotate the star counter-clockwise or "down" to loosen them. There should not be any type of keeper that will keep it from loosening; if you take a look at the video I linked and forward to about the 4:25 mark you can see how the brakes should be adjusted.
    view full answer...
  • Comparison of Dexter Axle and Axle Technology 12,000 Pound Brake Assemblies
    Dexter Axle has the brand recognition so that will definitely weigh more in their favor. Axle Technology isn't as well known even though their parts are very common on trailers but they're mostly used buy trailer manufacturers. So their parts often come on trailers but aren't as commonly used when someone is buying replacement parts. The Axle Technology brakes, like # AKEBRK-12R for the right and # AKEBRK-12L for the left, are good quality brakes and some of our installers here even...
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  • Electric Trailer Brakes for Trailer With 24,000 lb GVWR
    We have electric brakes that have the weight capacity for a tandem axle trailer with a nearly 24,000 lb GVWR, and I can tell you how to determine if they will fit, but we don't have any way of knowing the correct brakes for a 1994 Trail King trailer. The electric brakes that do have the capacity you need are the following: - Electric Trailer Brake Kit w/ Dust Shields - Self-Adjusting - 12-1/4" - Left/Right Hand - 12K # AKEBRK-12 These brakes measure 12-1/4" diameter x 5" wide, so in order...
    view full answer...
  • Converting Electric-Over-Hydraulic Brakes to Electric Brakes on Trailer
    If your trailer is currently equipped with electric-over-hydraulic drum brakes then a good portion of the conversion process to change it to an electric only brake setup will simply be removing existing components that are no longer needed. You will need to replace the hydraulic brake assemblies with electric units such as the # AKEBRK-12 if your Dexter 12K axle currently has 12-1/4 inch x 5 inch drums and re-wire the trailer accordingly. I have attached a great article on...
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  • Recommended Brake Assemblies for Tandem Axle Trailer with 12K Axles
    The Electric Trailer Brakes # AKEBRK-12 come as a set for one axle, so you'll receive the left and right brake assembly in each package. If you've got a tandem axle trailer, you'll want 2 sets of them. Since these brake assemblies don't come with mounting hardware you'll also need part # BRKH122510, which is the mounting hardware for brake assemblies this size.
    view full answer...
  • Brake Assemblies Compatible With Dexter 12,000 lb Axles
    Yes, the Electric Trailer Brake Assembly # AKEBRK-12R for the right hand and # AKEBRK-12L For the left had are confirmed to fit your Dexter 12K Axles. They are comparable to the Dexter Assemblies # 23-442 and # 23-443. You may also be interested in the Brake Adjustment Spoon for Drum Brakes # W80630 to adjust your brake assemblies.
    view full answer...
  • 12,000 lb Electric Trailer Brakes & Replacement Oil Seal & Bearings For 12k Dexter Axle
    I was able to find everything you need for your 12,000 lb Dexter axles; the electric brakes, oil cap kit, oil seal, bearings, and races. I verified with Dexter that these are indeed the correct parts for your 12k axles. I'll go ahead and list out each of the parts you need to make it easier to order: - Electric Trailer Brake with Dust Shield - Self-Adjusting - 12-1/4" - Left Hand - 12,000 lbs # AKEBRK-12L - Electric Trailer Brake with Dust Shield - Self-Adjusting - 12-1/4" - Right Hand...
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  • Availability Of Replacement Magnet For A 12-1/4" x 5" Electric Brake Assembly
    We do offer a replacement magnet for the 12-1/4" x 5" electric brake assemblies. The magnet you will need it part # BP01-306. This magnet is designed to replace the magnet of Dexter's 12-1/4 brake assemblies for 15K axles. It will also fit other brands of axle such as our AxleTek and Lippert.
    view full answer...
  • Replacement Brake Assemblies for Trailer with Dexter 12k Axles
    We do have the correct brake assemblies you are needing for your Dexter 12k axles that has 5 inch wide assemblies that attach with a 6 lug bolt pattern. The best option is the assemblies part # AKEBRK-12 that come with both sides. The price on these compared to the Dexter equivalents # 23-442-443 is considerably better and the quality is essentially the exact same.
    view full answer...
    Image 1 for
  • Troubleshooting Electric Brakes Not Fully Engaging
    Thanks for the purchase and if your Electric Trailer Brake Kit w/ Dust Shields # AKEBRK-12 are not giving you full braking, even with the brake controller all the way up, you likely have a wiring issue as that is the root cause of most trailer brakes not giving you full stopping power. First, start by checking your trailer connectors to make sure they are free from corrosion, which will be white or green in color and if it is there, clean as needed. Corrosion in a connector will hamper...
    view full answer...

Do you have a question about this Trailer Brake?

Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Written by:
Alexander C
Employee Ryan F
Written by:
Ryan F

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