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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. 15 Inch Wheel
  7. 16 Inch Wheel
  8. 16-1/2 Inch Wheel
  9. 17 Inch Wheel
  10. 17-1/2 Inch Wheel
Electric Brakes w/ Dust Shields - Self-Adjusting - 12-1/4" - Left/Right Hand - 12K - 10 Pairs
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Electric Brakes w/ Dust Shields - Self-Adjusting - 12-1/4" - Left/Right Hand - 12K - 10 Pairs

Part Number: ETBRK212A
In Stock
$2,479.27
Trailer Brakes
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Self-adjusting electric trailer brakes measure 12-1/4" x 5". Brake pads are made of durable friction material for improved braking. E-coated backing plates resist rust. Dust shields protect from debris. Fit 15" or larger wheels. Great Prices for the best trailer brakes from etrailer. Electric Brakes w/ Dust Shields - Self-Adjusting - 12-1/4" - Left/Right Hand - 12K - 10 Pairs part number ETBRK212A can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (375)
  • Q & A (0)
  • Videos (1)
  • Photos

etrailer by AxleTek Trailer Brakes - ETBRK212A

Highlights

  • No More Brake Adjustments: Self-adjusting design keeps shoes aligned—no routine manual tuning needed.
  • Ready for Heavy Loads: Rated for 12,000-lb axles with 12-1/4" x 5" assemblies for strong braking power.
  • Built to Last: E-coated backing plates and dust shields resist rust and block debris on the road.
  • Smooth, Reliable Stops: Automotive-grade friction pads are fully bonded to prevent cracking and lockup.
  • Cleaner Maintenance: Adjuster plugs seal access holes, keeping dirt and grime off brake shoes.
  • Certified Safe Performance: QAI and CSA tested to meet braking and durability standards.

Features to know about

Stop Worrying About Manual Adjustments: Self-Adjusting Electric Brakes

Standard electric brakes need periodic tweaking to stay in tune. These self-adjusting assemblies automatically keep the brake shoes properly aligned, so you get consistent performance without crawling under to make adjustments. The 12-1/4" x 5" size and 7-bolt mounting pattern are built for 12,000-lb axles and wheels 15" or larger, giving you heavy-duty braking that stays dialed in mile after mile.

Built Strong for Heavy Loads: Automotive-Grade Friction Material

Each shoe is lined with durable, automotive-grade friction material that’s fully bonded—not riveted—for lasting strength and more braking torque. The tapered edges and circular-ground finish help prevent cracking and crumbling, reducing the chance of mechanical lockup. SAE-N certification means the pads meet environmental standards while still delivering dependable stopping power every time you hit the brakes.

Rust and Debris Don’t Stand a Chance: E-Coated Plates with Dust Shields

Brakes can take a beating from dirt, gravel, and road spray, but the e-coated backing plates on these assemblies resist wear and corrosion. The included dust shields keep grime and debris out of the mechanism so your brakes keep operating smoothly. Even the adjuster plugs are designed to seal up access holes and block out contaminants that shorten brake life.

Ready for Confident Control: Certified and Tested for Safety

These assemblies are QAI and CSA certified after extensive performance testing under real-world conditions. They’ve been evaluated for stopping distance, braking strength, and long-term reliability to ensure they deliver safe, predictable control under load. You get ten left-hand and ten right-hand assemblies ready to mount—just add the required hardware (sold separately) and connect your electric brake controller.

Specs

Quantity

  • Quantity: 10 left-hand and 10 right-hand assemblies

Application

  • Application: most standard hub-and-drum assemblies, including Dexter, Lippert (LCI), and AL-KO

Dimensions

  • Dimensions: 12-1/4" diameter x 5" wide

Mounting

  • Mounting flange bolt pattern: 7 bolt

Wheel Size

  • Wheel size: 15" or larger

Weight and Capacity

  • Axle rating: 12,000 lbs

Warranty

  • Limited warranty: 1-year

B1212E-21 AxleTek 12-1/4" x 5" LH Self-Adjusting Electric Brake Assembly - Drivers Side - 12K Axles - Dust Shield

B1212E-22 AxleTek 12-1/4" x 5" RH Self-Adjusting Electric Brake Assembly - Passengers Side - 12K Axles - Dust Shield





Video of Electric Brakes w/ Dust Shields - Self-Adjusting - 12-1/4" - Left/Right Hand - 12K - 10 Pairs
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for etrailer Electric Trailer Brakes w/ Dust Shields Spec Review

Ratings & Reviews

4.6

375 reviews
5 Stars
(304)
4 Stars
(35)
3 Stars
(9)
2 Stars
(7)
1 Star
(20)
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by:
Fit perfectly, now we will see how the actual brake pads hold up or hold on, either way that you care to look at it. Good price overall, but, something usually gets short changed like maybe the quality of the brake shoes? I will let you know after we do a few stops with 18k on deck.
Ray profile picture

Ray

11/14/2025

Doing great, no concerns

by:
Happy customer. Items arrived on time. Great price. Replaced brakes on our trailer.
by:
Individual who assisted me with my order was very knowledgeable. She took good care of my order and needs. If Iam right she help me with my return ordered. Job well done. Thanks!
by:
Very pleased, quick delivery and the parts look very high quality
by:
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.
by:
Fantastic product!
by:
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
by:
2008 Honda CR-V
I am usually not one to buy aftermarket parts, I always prefer “Made in USA”. However these brake assemblies were better then expected and fit perfectly. I’m yet to see the wear factor but they look good.
by:
Same deal, best prices and service anywhere so keep it up
by:
Need a refund, sent the wrong parts.
Mike L. profile picture
Etrailer Expert

Mike L.

4/2/2026

I'll get that taken care of for you, Shane.

by:
Fit as it should. Would order again
by:
I received my order quickly and correctly. Awesome company to purchase trailer parts from. Great quality.
by:
Excellent customer service and super fast shipping.
by:
Works great perfect fit. Fast shipping.
by:
Exact replacement
by:
fast shipping, great service
by:
An awesome experience. Customer service is great, and the parts were exactly as advertised. Delivery was on time.
Brooke M. profile picture
Etrailer Expert

Brooke M.

5/23/2025

Glad to hear that, Gini. Are you fixing up the trailer for an upcoming trip? :)

by:
The reason I gave the 5 star is because of the timely delivery, low cost, and free delivery. The quality is the same that I could buy locally, however the savings is so significant that I had to buy them. I'm a mobile independent mechanic and I try to give my customers the best products and deals I can. I'll be buying more from etrailer.com. Thank you.
by:
The product was fine but the way they packaged it for shipping was terrible. It came pretty beat up and I had to straighten out the back plates on a couple of them.
by:
Easy install as they were an exact replacement. Glad to have found self adjusting brakes as it was difficult crawling under my 5th wheel, raising a wheel off the ground and performing the adjustment procedure. It took several hundred miles for these to burnish in completely. Once they did, my brake controller setting was reduced from 100% to 40%. Our 7 week road trip took us through Grand Tetons, Yellowstone, mountains of Idaho, Washington and Oregon. The brakes were great the entire trip.
by:
Not fitting my 12" drums! I need to order new drums or return brakes for ones that fit 12" drums!
Kate F. profile picture
Etrailer Expert

Kate F.

6/5/2026

Sorry to hear that Merle. Can you please confirm your axle capacity, and is there any numbers stamped on your existing hub so I can see what you currently have? How old is the trailer you are working on? These are 12 1/4", so that explains why they are not fitting your 12" drum, I would like to find you the right parts, just need some more info =)

by:
Have not taken trailer on long trip yet but, testing and adjusting went well
by:
2021 Ram 3500
Feliks. T. profile picture

Feliks. T.

6/6/2023

Working very well

Mike L. profile picture
Etrailer Expert

Mike L.

7/6/2023

@FeliksT We're glad to hear that you're happy with your brake assemblies!
by:
Excellent service and attention
by:
E-trailer makes it very easy to order your brakes and trailer parts they have you in the computer you can go for a couple years and not buy anything and they can tell you with seconds what you bought last, makes it very easy would recommend them to anyone. As for quality of the brakes you get about a year on them I run 5 days a week $85,000 miles a year. If you don't run them as hard as I do with the weight I carry they could possibly last two or three years even more. Self adjusting works great, put them on you don't have to mess with them.
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Wilson B
Updated by:
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Employee Alexander C
Written by:
Alexander C

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