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  1. Trailer Brakes
  2. etrailer
  3. Electric Drum Brakes
  4. 3500 lbs Axle
  5. 10 x 2-1/4 Inch Drum
  6. Standard Grade
etrailer Electric Trailer Brakes - Self-Adjusting - 10" - Left/Right Hand Assemblies - 3.5K

etrailer Electric Trailer Brakes - Self-Adjusting - 10" - Left/Right Hand Assemblies - 3.5K

Item # AKEBRK-35-SA
Our Price: $125.77
Trailer Brakes
Shipping Weight: 20 lbs
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The automotive-grade pads on these automatically adjusting brakes offer lasting effectiveness. 10" x 2-1/4" Assemblies have rust-resistant, e-coated backing plates to protect from road debris. Fits 13" to 15" wheels. Great Prices for the best trailer brakes from etrailer. etrailer Electric Trailer Brakes - Self-Adjusting - 10" - Left/Right Hand Assemblies - 3.5K part number AKEBRK-35-SA can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (2023)
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etrailer by AxleTek Trailer Brakes - AKEBRK-35-SA

  • Electric Drum Brakes
  • 3500 lbs Axle
  • 10 x 2-1/4 Inch Drum
  • Standard Grade
  • Self Adjust
  • etrailer

The automotive-grade pads on these automatically adjusting brakes offer lasting effectiveness. 10" x 2-1/4" Assemblies have rust-resistant, e-coated backing plates to protect from road debris. Fits 13" to 15" wheels.


  • 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
  • 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
  • Adjuster plugs (included) protect internal components from dirt, grime, and road debris
  • E-coat on backing plates fends off rust
  • Left-hand (driver's-side) and right-hand (passenger's-side) brake assemblies included
    • Mounting bolts and hardware (BRKH10B) sold separately
  • QAI , CSA , and SAE-N certifications ensure quality


  • Application: most standard hub-and-drum assemblies, including etrailer, Dexter, Lippert (LCI), and AL-KO/Hayes
  • Dimensions: 10" diameter x 2-1/4" wide
  • Mounting flange bolt pattern: 4 bolt
  • Wheel size: 13", 14", and 15"
  • Axle rating: 3,500 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.

B10EA-21 etrailer by AxleTek Electric Brake Assembly - LH - Driver Side - 10" x 2 1/4" - Self-Adjusting - 3,500 lbs

B10EA-22 etrailer by AxleTek Electric Brake Assembly - RH - Passenger Side - 10" x 2 1/4" - Self-Adjusting - 3,500 lbs

Customer Satisfaction Score:

Customer Reviews

etrailer Electric Trailer Brakes - Self-Adjusting - 10" - Left/Right Hand Assemblies - 3.5K - AKEBRK-35-SA

Average Customer Rating:  4.7 out of 5 stars   (2023 Customer Reviews)

The automotive-grade pads on these automatically adjusting brakes offer lasting effectiveness. 10" x 2-1/4" Assemblies have rust-resistant, e-coated backing plates to protect from road debris. Fits 13" to 15" wheels.


After fully installing, taking for a drive, they did not auto adjust. My truck brakes were hot and smelled so I know my truck did mist of the work. I felt the trailer brake drums, not even warm. Okay, they need to be adjusted. Not a problem. But after looking up a quick video to remind me how to set the brakes, I went for it. If you rrad etrailer's ultimate guide to to adjust the brakes, it calls for trailer to be jacked, remove plastic covers to access adjustment screw, turn until tire or drum difficult to remove. Then back off about 10 turns until slight drag of brake pads on drum. However, these chinese POS drums DONT HAVE A DAMN NOTCH for you to reverse the tightness. 25min later using with two screwdrivers, one to hold a spring retention plate and the second to try and reverse the screw on its thread, with no joy. Extremely frustrating to have to pull the tire of, then pry the damn drum off because the brakes are holding it on super tight. Once drum removed, the damn brake adjustment screw had tiny small catches shaped in the direction of tightening only, hence why my flathead kept slipping off and wouldnt release tension on the pads. Tried to jack other sides tire and tighten slowly...but oops one fricking click to far and have to repeat whole damn process. I took the time to write up this review as Im pissed and need to cool off before I have to remove second tire. What should have been a 2-2.5hr job has nearly doubled.

Etrailer Expert

Katrina B.


Of course they were difficult to manually adjust, since these are designed to self adjust. I am sorry that you had to do that Jonathan! I have gotten in contact with one of our installers and they have confirmed that even though these are self-adjusting brakes, there is a period after you first install them that you will need to break in the brakes. This could be why the brakes were not adjusting when you initially tried to use them. In order to Break them in, you will need to apply the brakes several times while moving slowly to allow them to self adjust to the correct tension. They will feel pretty weak at first until they reach the correct adjustment. So the easy solution for you would be to take out the trailer and while travelling slowly reach down and grab the manual override lever of the controller several times and youll feel the brakes start to grab harder and harder.



My main point was the sprocket does not have a notch to reverse the tension. A service rep did point me in good direction to check voltage. Turns out I had to re-wire brake power line as I had greater than 1-1.5 voktage from truck to brake assy. My was 4-8 volts. Meant corrosiin in the wire. Re-wired, new crimp connections and viola, voktage within range. Also, etrailers guidance on how to adjust these brakes by driving and applying controllers manual over-ride is seriously understated. Perhaps because you sell so many brake assemblies that all you provide is blanket instructions. Fair enough. However, it took over 50 applications: driving up to 40mph, not touching vehicle brake, but only using brake controller manual override to slow the vehicle to 20-25mph. Agressive break-in is relative. Better upfront written description of this will help set the expectation of future buyers. Too bad actual mechanics arent the ones writing this stuff up and talking with customers.


Old brakes and new brakes. I know, I disturbed years of spider handy work, nasty. Totally happy with my first purchase and the fact that I got the right ones. I actually had no idea they came assembled like they do. I wouldn't of sand blasted and painted the base plates. So happy with the results. Thank you etrailer!



Its been a year and a day since I last posted how happy I was with these brakes I purchased. I wish I could say that Ive taken this 1968 completely rebuilt from the ground up camper on a trip, but I cant. Im not done yet. I can tell you that I did hook up to the truck with the camper jacked up and was able to test the brakes and they worked perfectly. I also adjusted them because I had initially set them loosely to fit right on. Adjusting them can be sort of tricky, but etrailers videos are very helpful and I was able to set them just right. I would have been totally done this summer, but getting a new VIN number is currently in the works as well as curtains and cushions. Rebuilding old campers is not for everyone, but finding etrailer early on for me was another tool in the arsenal. Good luck everyone with your projects. Theres nothing like getting it done yourself.

Etrailer Expert

Mike L.


@Jason That's awesome, we're happy we could help! Please keep in touch and let us know how it's going...


2014 stealth enclosed trailer. Fit good no issues as everyone has mentioned before packing could be better but mine shipped fine.

Logan H.


Work just as they’re supposed to. Easy install, not sure why I put it off for so long. Will get the same ones again when it’s time to replace them.


This is the trailer I built using your spindles and electric brakes.
It towed beautifully from Texas to Kansas City and back for the World of Wheels.


I'm only giving 4 stars for the incredibly poor packaging of my order. The drums I ordered were thrown in on top of the trailer brake kit, and knocked the brake shoes out of alignment. After installing the backing plates, I had to take them both apart to put the shoes back in place. Other than that, works well.


My 14 foot doolittle trailer didn't have brakes but had a brake ready axle. These worked well. Do require a fair amount of wiring if add to a trailer that does not already have brakes. Haul my side by side in a triples configuration with my fifth wheel camper and they self adjust well and are very responsive to changes in gain settings. Would recommend


Great,fast shipping. Some people have said it needs better packing. I ordered two (Right and Left). One did arrive "ajar". However, it's easy to fix. Just get a ten-inch piece of 2x4 wood, and a hammer and knock it back into place. Use the wood between the hammer and the brake as a cushion. I will write an update after I install them. I am happy with my purchase. I don't think any more packing would help the "jarring out of alignment". The brakes are sort of spring-loaded. It can happen because of the springs and bummpy transportation. I will post an update after I install them and use them. I don't anticipate any problems. This is a honest review and five stars happy.


I ordered 2 set of the brake kits for a tandem axle trailer. I have not installed them yet, so can't say how they work, so giving an "average" rating. What I can say is the packaging was about 1/2 star below poor. For heavy parts, brown paper was used to wrap the brake kits. Absolutely no padding and then they were sent in an oversize box. One of the brake shoes came off of the post during shipping. I was able to get it back where it was supposed to be, with about 15 minutes of grunting clamped to my work table. I called the order in and discussed the poor shipping/packaging in previous reviews and was assured those sort of shipping problems were in the past. I guess they have not been resolved. No damage seems to have occurred to any of the brake kits, but, I will be madder than a wet hen if I find out otherwise after installing the parts on my trailer.


Once my brother taught me how to install these trailer brakes, it couldn't have gone any better. I towed the trailer with these new brakes 2000 miles each way over mountain ranges with absolutely no problems or issues that I didn't cause myself. I didn't put enough grease in the bearings, and they got a little warm. Using the bearing buddies, I had for them made it easy to add more grease and the trailer pulled fantastic and stopped as intended. I'll definitely be coming back to etrailer for my towing needs.


The right brake assembly arrived with the adjuster sprocket and lever misaligned and not even touching one of the shoes, so I had to disassemble that half and put it back together correctly. The assemblies also didn’t come with nuts to bolt them to the axles, so I had to get those separately. Otherwise, they seem to be a good value, especially with the free and quick shipping.

Etrailer Expert

Katrina B.


You are correct, these brake assemblies come with the following: Left-hand [drivers-side] brake assembly, right-hand [passengers-side] brake assembly, and mounting bolts. However, the nuts and lock washers are sold separately. We recommend part # BRKH10B.


They arrived in short order & were a perfect fit. They bolted up with absolutely NO issues. After a year of using this trailer & about 7000 miles of moving livestock & large rd balesim MORE than pleased. I live in the valley with a mile long hill on either side. These brakes have been GREAT !



Well, Im stillborn than satisfied with the brakes. Thus trailer now has at least 5000 miles on it since the brake job &amp there hasnt been a single issue.

Etrailer Expert

Mike L.


@Robert We're glad your replacement brake assemblies are working well for you!


the packaging was poor at best. nuts and washers were loose in the box hardly any packaging in the box and because of how it was packaged the insulation on some of the wires was worn away and wires were exposed. I wont be buying from them again unless I absolutely have to.

Etrailer Expert

Jenny N.


I understand your frustration with receiving the order in this manner. I will share this feedback with our shipping department and I will have our customer service team reach out to you.


Received these electric brakes today and have them on trailer along with new drums I received on my last shipment from etrailer. Every thing fit great and look good, will test them tomorrow.


Brakes are exactly like OEM. etrailer’s service was extremely fast. My go to place for RV parts.



One year later, brakes are working fine. It is December and we are about ready to ship off to Florida. They will get a real workout on the interstates while traveling. I still think etrailer’s customer service is the best in the business.

Etrailer Expert

Mike L.


@Lance Thanks, we're glad to hear that. Good luck on your trip!


Left hand brake assembly was correct and in working order,, right hand brake assembly was assembled incorrect,, I had to fix it before I put it on the trailer

Etrailer Expert

Katrina B.


I am sorry that this happened to you. It looks to me like the right side self-adjuster was knocked loose during shipping and handling. I am glad to see that you were able to correct the situation! Please let us know if you are needing any further assistance.


Used these on a custom built offroad camping trailer. Easy install, just don't forget to order the mounting hardware. These bolted right up to the Timbren suspension (ASR3500S06) in about 5 minutes. Also used the 10 inch 5x5 drums to mate to Jeep Wrangler wheels. I would recommend this product and as a whole. Great customer service and fast shipping.


My old brakes had been on the trailer for many years and were completely worn out. Rather than buy the components locally and have the drums turned, I decided to buy the kits from Etrailer. That turned to be a good decision.

The assemblies were very easy to install and have worked flawlessly. It took a while for them to burn in (as the information predicted) but the end result is a very smooth braking system. I couldn't be more pleased with the outcome.


Tows like a dream. With the trailer attached is just like driving with no trailer at all. Brakes are responsive and smooth. I also replaced the drums with Dexter Trailer Hub and Drum Assemblies. All bought from etrailer, all fit perfectly. No problems! Very happy with the product and the results.



Still tows like a dream. With the trailer attached is just like driving with no trailer at all. Brakes are responsive and smooth. I also replaced the drums with Dexter Trailer Hub and Drum Assemblies. All bought from etrailer, all fit perfectly. No problems! Very happy with the product and the results. There are no issues with the brakes, they still look brand new.


Parts themselves were fine, but the customer service and lack of communication gets the one star. Split shipped my order which was time sensitive. NO mention of this at the time of check out or in my shipping confirmation email. Ordered on a Sunday evening, due to arrive on that Wednesday. Trailer was set to leave for a trip (from NY to Florida) on Saturday. Received my order missing the 2 left brake assemblies. Called etrailer and was told about the split shipment and wouldn't recieve the rest of parts till Monday. Sorry ain't happening. Had to source needed parts elsewhere to finish job so trailer could be used for trip. Now I gotta deal with getting credited and returning these parts. Had I known this at time of order I could have worked with this issue.



This was an upgrade
to my 2015 Suretrac 5x8 square tube single axle utility trailer. The trailer was not equipped with them when I purchased it. I quickly realized after two trips with a full load that they would easily improve safety.

My tow vehicle came equipped with an integrated brake controller as well as a 7 way rv plug.

I performed this installation with the trailer raised up an only a inch or two, resting on safety stands. !! Of course, a lift would make this operation go much easier. !!


THE etrailer parts were easy to assemble. All fit perfectly together. Obviously I did have to adjust the brakes a small amount to get them within the activation reach.


1) To insure correct wiring it required extra patience and planning. I found the information regarding what wire activated what to be a bit confusing online. Using an inexpensive test light proved extremely helpful. For me it helped to determine from the start each connection point and color code that were meant for each other (in my situation changes in coding took place). To make it go smoothly I drew our a schematic before getting settled underneath. Note: that I have included images of the old flat plug wiring along with the coding.

2) If I were to do this again, I WOULD HAVE spliced the wiring to both L & R brakes before hand. Lying flat on my stomach underneath the trailer and trying to both properly strip and crimp the short pieces of wire from each brake to the 12 gauge lengths of wire was a little tedious.

*Parts list from etrailer:


(1) ET7WK Trailer Wiring 7-Way Upgrade Kit

(2) AKHD-545-35-K Trailer Hub and Drum Assembly - 3,500-lb Axles - 10" Diameter - 5 on 4-1/2
(1) AKEBRK-35-SA Electric Trailer Brake Kit - Self-Adjusting - 10" - Left and Right Hand Assemblies - 3,500 lbs

(1) BRKH10B Mounting Hardware for 10" Brake Assemblies

*Additional wiring (below), ties, a few screws, electrical tape, extra crimps and stud crimps, etc. were locally sourced for connecting from the box upgrade kit to both L&R brakes.

(1) 12ft section of white 12 gauge

(1) 12ft section of black 12 gauge

*Additional grease, both tube and tub type were purchased along with large rubber gloves for greasing and hub installation.

NOTE: at this date I have NOT yet driven the trailer with the brakes. I had only tested them by hand spinning each wheel while having someone actuate the [trailer brakes only] from the vehicle.


It's been about a year since i converted my boat trailer to electric brakes. I'm very happy with the results. Brakes are stronger and adjustable through the controller. It was cheaper than replacing all of the hydraulic parts (which was needed) and I love the fact that they don't engage when I'm trying to back up.


The assemblies seem to be of good quality but they over adjust during use. I set my brake controller for the load and a few stops down the road I have issues with the brakes locking up, lock up issue has caused flat spots on my tires as well. Also they have excessive drag on the drum, to the point it has burned the paint off the drum and is now rusting, didn't have that issue with the prior set of brakes. It's far less hassle to slide under the trailer once a year to adjust brakes then deal with these "self adjusting" brakes.

Etrailer Expert

Jenny N.


There can be a few reasons that the brakes are braking too hard. I would make sure that the hub has a slight drag to it when you manually turn it. If it cannot be turned or is very difficult to turn, then it is adjusted too tight. You also want to make sure that the castle nut is finger tightened and not torqued on. It can cause the hub to heat up. Also make sure that the brake controllers gain is not set too high.


I purchased brakes, bearings, and hubs to retro fit on a utility trailer. The customer service staff walked me through the ordering process, and made it simple. Tracking was simple, and the parts arrived as expected. The "kit" was complete except for the backing plate nuts and washers, which are separate part number. Overall convenient process.


My trailer brakes were weak, so I checked them out... 3 of the 4 sets had linings that had come of the shoes. I started checking prices on replacement parts, but found the price of an entire assembly cheaper than a few parts. Called etrailer and spoke with Ashley to confirm part numbers and availability. Ordered a set of 4 complete brake assemblies for my trailer.
The parts arrived within a few days. I replaced all 4 sets in about an hour and 15 minutes! Completely straight forward process! An impact wrench will help remove the 4 nuts from old assembly.
My trailer now has brakes again!! Thanks to Ashley and etrailer for good prices, good information, quick shipping, and great replacement parts!

Pictures show a lining off my original brakes; one new assembly; one new assembly installed; and finally both assemblies installed on one side of my trailer.


Product came as described with on time, fast delivery. I've found no issues with my etrailer orders in the past as well.

Show More Reviews

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    In order to find the correct replacement braking assemblies for a trailer you'll need yo know the axle capacity which can usually be found by locating the axle tag on the center of the axle. Once this is found, we can use this and match it to a set of braking assemblies. For example, the Electric Trailer Brake Kit part # AKEBRK-35-SA is for 3,500 lb axles and the Electric Trailer Brake Kit part # AKEBRK-7-SA is for 5,200 lb - 7,000 lb axles. These are the two most common braking assemblies...
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  • Recommended Brakes for a 2018 Forest River Flagstaff Hard Side Camper T21QBHW
    To add brakes to your 2018 Forest River Flagstaff Hard Side Camper T21QBHW you will want to the Electric Trailer Brake Kit item # AKEBRK-35. This kit includes both the left and right side brakes. These are for up to a 3,500 lbs axle, fit a 10" x 2-1/4" drum, and the brake mounting flange has a four bolt pattern. If you would like self adjusting brakes you will want the Electric Trailer Brake Kit item # AKEBRK-35-SA. I have linked a review video below.
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  • Replacement Braking Assemblies for an R-Vision Trail-Lite Trailer
    I am not sure which replacement braking assemblies you need for your trailer but this is pretty easy to find out for yourself. The only thing you need to do is crawl under the trailer and try to find the white axle sticker which should display it's weight capacity but if not just send me a photo of this. If you are able to find the weight capacity then you can match that to one of the below options which are most common. Electric Trailer Brake Kit - part # AKEBRK-2 (2,000 Lb Axles) Electric...
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  • Torque Figure for Installing Electric Brake Assembly # AKEBRK-35-SA
    The torque figure to use when tightening the nuts that hold the Electric Trailer Brake Kit # AKEBRK-35-SA to your spindle bracket is 45 to 50 ft lbs of torque.
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  • Are Trailer Brake Magnets Polarity Sensitive
    Trailer magnets are not polarity sensitive. You can run either wire as power or ground and you'll be fine.
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  • Replacement Brake Assemblies for Dexter 3,500 lb Axle
    You are absolutely correct that it makes more sense to go with all new assemblies over magnets for cost reasons, because everything is new, and it's easier to install. For a 3,500 lb Dexter axle the best bang for your buck is the part # AKEBRK-35-SA which comes with new assemblies for both sides of the axle that are self-adjusting. These will fit as a replacement and work well.
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  • Why It Is Better to Replace Entire Trailer Brake Assembly When Pads Are Worn Out
    We don't have a way to pick out the correct brake pads for your trailer based on the model or VIN. Typically it's more cost effective though to just replace the entire assemblies.It's an easier install, the price is about the same, you don't have to be as specific when picking out the replacement parts, and you get all new braking components as well. To pick out the correct brake assemblies for your trailer you need to know a few things. You will want to measure the inner diameter of...
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  • How to Pick Out Replacement Electric Brake Assemblies for Trailer
    If you are looking to replace the existing electric brake assemblies on your trailer, you will just want to note a couple of things. First, you will need to measure both the inner diameter and depth of your hub/drums. I have attached an image that clarifies the dimensions you need. Then, you will want to make sure that the brake assemblies you choose match up to the bolt pattern on your axle mounting flange. Finally, the replacement assemblies should have the same weight rating as the...
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