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Hydraulic Trailer Brake - Uni-Servo - Free Backing - 10" - Right Hand - 3,500 lbs

Hydraulic Trailer Brake - Uni-Servo - Free Backing - 10" - Right Hand - 3,500 lbs

Item # AKFBBRK-35R
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AKFBBRK-35R - Hydraulic Drum Brakes etrailer Accessories and Parts
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Free-backing, passenger-side drum brake won't engage when you reverse, even if your actuator is activated. Automotive-grade friction pads and e-coated backing plate are long-lasting. Fits 13", 14", and 15" wheels. Call 800-298-1624 to order etrailer accessories and parts part number AKFBBRK-35R or order online at Free expert support on all etrailer products. Guaranteed Lowest Price and Fastest Shipping for Hydraulic Trailer Brake - Uni-Servo - Free Backing - 10" - Right Hand - 3,500 lbs. Accessories and Parts reviews from real customers.
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etrailer Accessories and Parts - AKFBBRK-35R

  • Trailer Brakes
  • Hydraulic Drum Brakes
  • Brake Assembly
  • etrailer
  • 10 x 2-1/4 Inch Drum
  • RH
  • Free Backing
  • 3500 lbs

Free-backing, passenger-side drum brake won't engage when you reverse, even if your actuator is activated. Automotive-grade friction pads and e-coated backing plate are long-lasting. Fits 13", 14", and 15" wheels.


  • Hydraulic drum brake assembly is designed for use with a surge-type trailer brake actuator
  • Free-backing design lets you back up without engaging the trailer brake, even if the actuator is activated
    • Fall-away brake shoe only anchors on drum when brakes are engaged as trailer is moving forward
  • Automotive-grade friction material is molded to brake shoes
    • Pads are fully bonded - not riveted - to shoes for long life and more braking torque
    • Less chance of cracking and crumbling that can lead to mechanical lockup, thanks to tapered edge and circular grinding
  • Periodic manual adjustment required
    • Fine-tooth brake adjustment gear allows for a more precise setting
  • E-coated backing plate resists wear and corrosion
  • Single plunger design
  • Adjuster plugs (included) cover access holes to keep dirt and grime out of the assembly and off of the shoes
  • Brake mounting bolts are included
    • Nuts and lock washers (BRKH10BS) sold separately
  • QAI and CSA certified


  • Application: most standard hub-and-drum assemblies, including Dexter, Lippert (LCI), and AL-KO
  • Configuration: right hand (passenger's side)
  • 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

Note: Because free-backing brakes are designed to eliminate nearly all friction between the brake shoes and the drum when you are driving in reverse, a trailer breakaway kit will not be effective should your trailer disconnect from your tow vehicle while you are backing up.

Free-Backing Brake Assembly

Free-backing brakes let your trailer move in reverse without the brakes being activated by your surge actuator. These brakes are needed if your actuator does not have a reverse lockout, which is a mechanism that ensures that the actuator does not activate when your rig moves in reverse.

This free-backing hydraulic brake assembly has a fall-away shoe, which provides full braking when your trailer is moving forward, but supplies only limited friction when the trailer is moving in reverse. During normal forward braking, the fall-away shoe expands to catch your brake drum. When driving in reverse, however, the fall-away shoe's extra spring will overcome the pressure from the brake cylinder. This keeps the leading edge from catching on the drum, so the shoe will not fully pivot into the drum. This exerts a smaller amount of friction, just enough to provide a minimal amount of braking when in reverse.

This trailer brake assembly acts as part of your trailer's hydraulic braking system. A hydraulic trailer brake actuator is required for this brake to function.

Thoroughly Tested for Safety

This brake assembly meets the requirements for certification by the Canadian Standards Association (CSA). The CSA creates standards, which when complied with ensure a safe and quality product. This brake assembly underwent extensive testing to measure stopping distances when braking. This brake has also been tested by QAI for braking performance in a complete automotive setup and under real-world conditions to provide the most realistic scenario for the everyday driver.

Automotive-Grade Friction Material

Each shoe on this brake assembly is lined with automotive-grade friction material for improved stopping performance and longevity. The friction material is fully bonded onto the surface of the brake shoe. This lining is custom-molded for a perfect fit. The edges are tapered to ensure long-lasting performance. This taper, along with the circular grinding that the lining undergoes, helps to prevent cracking and crumbling. This durability helps to prevent mechanical lockup, which can occur when brake shoes are excessively worn or broken.

The friction material is also SAE-N certified, which means that it is an environmentally safe product that complies with California and Washington regulations regarding the composition of brake pads. As a result, this material not only provides high-performance braking that can endure the test of time, but it is also environmentally friendly and safe for use throughout the United States and Canada.

12-810 AxleTek 10" X 2-1/4" RH Hydraulic Brake Assembly - Free Backing - Passengers Side - 3.5K Axles - E-Coat

Video of Hydraulic Trailer Brake - Uni-Servo - Free Backing - 10" - Right Hand - 3,500 lbs

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

Video Transcript for etrailer Trailer Brakes AKFBBRK-35R Review

Today we're going to take at the 10" Uni-Servo Free Backing Hydraulic Trailer Brake Assembly for 3,500 Pound Axles. This one is the right hand passenger side assembly. Now, this hydraulic drum brake assembly is a uni-servo and a free backing design which is used on trailers with surge type brake actuators, that have no reverse lock out. The uni-servo design you can see right here is a single plunger design. The free backing design, you can always tell by the D-shape shoe. This will let you back up without engaging the trailer brake even if the actuator's activated.

This fall away shoes, the D-shape right here will provide full breaking when your trailer's moving forward. It's applies on the limited friction when the trailer's moving in reverse. Now, the size on this brake assembly is 10" by 2 1/4". When they say that, and this is the passenger side brske assembly. Now when they give you the size of 10" by 2 1/4", that measurement, the 10" would be the diameter from this brake pad to this brake pad right across. Then the 2 1/4" would be the width of the pad itself.

If we take the ruler and put it edge to edge, you will see right at 10". Then the 2 1/4", if we do it on a pad, let's see 2 1/4" the width of the pad. It's 10" by 2 1/4", and this is the right hand passenger side. Usually, when you get the way you can tell what side this goes on, when you get them brand new, they'll have a sticker of course that'll say right or left side. That's pretty easy, but if you have one that doesn't have the sticker, the easiest way is just to look at the size of the pad on the brake shoe. If you see here, this pad goes here to here.

If you look at this one, it goes all the way here to here. This is a longer pad than this one, the shorter pad is your primary shoe, so that will always face the front of the trailer. That will tell you that this one is the passenger side brake assembly. That's the easiest way to tell what side it goes on. Now this brake shoes are lined with an automotive grade fiction material.

This friction material is fully bonded, it's not riveted to the shoes. It gives you a lot longer life, more braking torque. The other nice thing is on the brake lining, usually in a lot of brake assemblies, they'll just chop off on each edge. This one they actually taper the edges, then they do a circular grinding on the pad to prevent cracking and crumbling that can lead to mechanical lock up. Now, this is a manual adjustment brake, so it does require periodic manual adjustment. The adjuster right down here and this is nice because this one has the fine tooth brake adjustment gear, so it allows for a more precise setting when you're adjusting it. There is no break-in period needed following your initial adjustment. When you go to adjust it, if you're to go to the back, you'll notice there's two adjuster plugs right here. This one's has the plugs included which is nice because a lot of brake assembly will leave that open. Just the holes open, and you don't really want that because dirt could get in there and cause problems with the brakes. They do actually give you the plugs, if you just pop one of those up, you can get your tool through there and then do your adjustment on the star wheel right down here. Now this is also the backing plate has a nice e-coating on it to give you excellent corrosion resistance. As you can see, this one uses a four bolt brake mounting flange, as you noticed, the mounting bolts are installed. Now the nuts and the lock washers we do sell those separately on our website. This brake assembly is certified by USSAE standards and CSA which is a Canadian standard. Again, the dimension on this is 10" by 2 1/4". The axle fit is a 3,500 pound axle, and this is designed to be used with 10" brake drums. That should do it for the review of the 10" Uni-Servo Free Backing Hydraulic Trailer Brake Assembly for 3,500 Pound Axles, and this one is the right hand passenger side assembly.

Customer Reviews

Hydraulic Trailer Brake - Uni-Servo - Free Backing - 10" - Right Hand - 3,500 lbs - AKFBBRK-35R

Average Customer Rating:  4.8 out of 5 stars   (312 Customer Reviews)

Free-backing, passenger-side drum brake won't engage when you reverse, even if your actuator is activated. Automotive-grade friction pads and e-coated backing plate are long-lasting. Fits 13", 14", and 15" wheels.


The AKFBBRK-35 L and R brake assemble is an excellent product. A very good product for the low cost compared to other products on the market. Excellent quality both in manufacturing and material. The hardest part in installing the new product was in getting the old parts off of the trailer. The new assembly bolted into place with no problem. Replacing the complete assembly is the best way to go rather than just replacing the shoes and brake cylinder and hardware. Sorry that I neglected to take a photo of the brake assembly installed but their performance was better than the original brakes which did not have the "free backing" feature. I feel much safer now when pulling a loaded trailer.


Prompt service is much appreciated. Brakes came nicely packaged to prevent transit damage. Product looks to be be well made but I'm putting them on the shelf. Brakes aren't required so I converted the trailer back to brakeless. With 4 boat ramps within 10 miles brakes aren't worth the hassle. I did use the spindle seal set (15123 Inner Bearing & 1.980t Or 1.938 Bb) which fit perfect.


Bolted right on perfect fit. Just needed to buy the correct nuts. They are fine thread studs on the unit.


Worked great an shipped timely... how can you beat that


Good price,selection & great tech support,will check with this site first on trailer maintenance.


This is the way to go for break repair on your trailer complete new break from backing plate to drum for what it coast me last time in parts ( bearing, seals, shoes, cylinder rebuild kit) and took less time to install, have not towed yet but sure it will be great.


I am changing trailer brakes from electric (I never know if they are working or not) to surge brakes. After calling to get information that was not clear in the on the website I ordered and received the necessary parts. The technical help on the phone was helpful and and the order processed and received promptly.


arrived as advertised. I had to make a change on my order and the customer service rep was very responsive in helping me with the change.


Had to replace 2 and upgraded to 4 for better braking and they have been great in 5000 miles. best price, free shipping and trouble free, what's not to like?

Try 2 yrs! At least since I purchased said items. Have probably put 6000 miles on everything with no issues. Thanks for checking and may God bless
Doug H - 07/20/2018


I had an excellent experience doing business with etrailer. The parts came in on time and really sooner than I expected. I received all the parts I ordered and they were very well packed. All phone calls with staff were very good and I plan to do more business with etrailer. Thanks, Jamel


The brake shoe kit was perfect for my application. It was easy to use the website and it arrived right on time. I’ve used etrailer before and will use them again.


Part was perfect, and quick shipping!


Arrived quickly! Everything I ordered was there. Went on the trailer very easily. Works great! Thanks!


This brake drum was shipped and arrived in a couple of days. It was exactly what I ordered. I installed it and we will see how well it holds up.



Just what the Dr. ordered. Received quickly and appears to be quality product fair price


Everything fit perfect Lisa was an excellent sales rep will buy from them again good company



Excellent service. Would order from aga in.




Review from a similar FreeBack 10 Inch in Accessories and Parts

My trailer is over 25 years old and my concern was if I was going to be able to get the right parts. Everthing was still the same as back then. Much easier to replace the whole Assembly as opposed to randomly replacing a part here and there. I now have a new trailer...well almost

Its been a year now since I have installed the hydraulic trailer brake kit assembly and drums to my boat trailer and they have been working as great as the day I installed them. No issues
Charles D - 09/22/2021


Review from a similar FreeBack 10 Inch in Accessories and Parts

I have ordered complete brake assemblies like these in the past for my 5th wheel. They are great and easy to install. No need to fight those springs and keepers that hole the brake shoes to the backing plate, (Pain) just remove the wheel and four bolts, install plate and wheel and adjust the brakes. Done in less than 30 min. a wheel. You save time and money! Great way to do your brakes and I like E-trailer's fast delivery.

Still working great, no problems!
Jan - 10/07/2021


Review from a similar FreeBack 10 Inch in Accessories and Parts

The product looked great and I got great service. I was unable to use the brakes, though because I needed 5 hole backing plate instead of the 4 hole backing plate. I never got around to seeking a return, my fault.


Review from a similar FreeBack 10 Inch in Accessories and Parts

I restored an old concrete buggy that I purchased surplus from a rental company. It was in pretty bad shape. I got it sand blasted. I painted it with Rustoleum. I installed new brake parts, master cylinder, and wheel bearing kits. Pretty big project but it came out great! Now I have a great little dual-axle dump trailer designed to carry a cubic yard of ready mix. Works great for short loads of concrete and for drain rock and landscape materials too. I had to use JB Weld to get a good seal on the new plastic master cylinder cylinder-to-brake-hose connection, which was a pain because it leaked and required multiple attempts to fix. Plastic threads on the plastic master cylinder didn't seal with teflon tape. They are easy to over torque/strip! Maybe I did that initially, but JB Weld fixed the problem. etrailer brake assemblies were easy to install and of very good quality. Fast shipping. Thanks!


Review from a similar FreeBack 10 Inch in Accessories and Parts

I did a total rebuild of my boat trailer. I ordered nearly all of the parts from etrailer. New carpet for the bunks new brakes and backing plates as well as a new brake actuator. New wheel bearings and seals. This trailer is old a 1974 but all of the parts fit I was satisfied with all of the products I received and the timely manner in which they were delivered to my door I am very happy with the fine service I received a t trailer and the help and selecting the right parts thank you very much etrailer.

Show More Reviews

Ask the Experts about this etrailer Accessories and Parts

  • Are 10 Inch Hydraulic Trailer Brake Assemblies Compatible with DICO Model 60 Actuator
    The Hydraulic Trailer Brake, Uni-Servo, Free Backing, 10 inch, Right-Hand # AKFBBRK-35R, that you referenced, will work well with your Dico Model 60 actuator. This brake assembly measures 10 inches x 2-1/4 inches and has a 4 bolt mounting flange bolt pattern. For the Left-Hand Assembly, you will want to use part # AKFBBRK-35L. All of our 10 inch x 2-1/4 inch hydraulic drum brake assemblies are for 3,500 pound axles. If you need new brake mounting hardware, you can use the hardware...
    view full answer...
  • 10 Inch Hydraulic Trailer Brake Assemblies for etrailer 3.5K Hub and Drum # AKHD-545-35-K
    The trailer hub and drum assembly # AKHD-545-35-K will take Bearing Buddy 1.98, # BB1980A or # BB1980A-SS (for stainless steel). For complete brake assemblies that fit this hub and drum I recommend the free-backing etrailer brakes # AKFBBRK-35L for the left side and # AKFBBRK-35R for the right side. If this is going on a boat trailer I recommend # AKFBBRK-35L-D for the left and # AKFBBRK-35R-D for the right. These brakes have a corrosion resistant dacromet coating ideal for marine applications. If...
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  • Recommended Trailer Braking System For 30 Foot Pontoon Trailer With Tandem Axle
    With a 6000 lb capacity on your pontoon trailer and 13 inch wheels, you most likely have 3500 lb axles. For this, you will want Electric Trailer Brake Assembly - Self-Adjusting - 10" - Right Hand - 3,500 lbs # AKEBRK-35R-SA and the left side assembly # AKEBRK-35L-SA. The mounting hardware kit is # BIK-00. You will want to run 10 gauge wire to these brake assemblies and it can be purchased by the foot # 10-2-1. To finish your wiring, I recommend the Epicord 7-Way Molded Trailer Plug...
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  • Hub and Drum and Brake Assemblies Rated for 3,500 lbs
    We have exactly what you need, so long as your current hub uses an # L68149 inner bearing and # L44649 outer bearing, which you will be able to tell when you remove your current hub assembly as the bearing numbers should be printed on the bearing themselves. If that is the case the exact parts you need are: - Dexter Trailer Hub and Drum Assembly for 3,500-lb Axles - 10" Diameter - 5 on 4-1/2 # 84546UC3 OR, if you have an E-Z Lube axle: - Dexter Trailer Hub and Drum Assembly for...
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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:
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