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  1. Trailer Brakes
  2. etrailer
  3. Hydraulic Drum Brakes
  4. 3500 lbs Axle
  5. 10 x 2-1/4 Inch Drum
  6. 14 Inch Wheel
  7. 14-1/2 Inch Wheel
  8. 15 Inch Wheel
Hydraulic Trailer Brake Kit - Uni-Servo - Free Backing - 10" - Left/Right Hand - 3,500 lbs

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

Item # AKFBBRK-35
Our Price: $123.22
Trailer Brakes
This item qualifies for Free Shipping
Shipping Weight: 19 lbs
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etrailer Hydraulic Drum Brakes - AKFBBRK-35
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Free-backing, driver's-side and passenger's-side drum brakes won't engage when you reverse, even if your actuator is activated. Automotive-grade friction pads and e-coated backing plates are long-lasting. Fit 14" to 15" wheels. Lowest Prices for the best trailer brakes from etrailer. Hydraulic Trailer Brake Kit - Uni-Servo - Free Backing - 10" - Left/Right Hand - 3,500 lbs part number AKFBBRK-35 can be ordered online at or call 1-636-306-4830 for expert service.
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etrailer by AxleTek Trailer Brakes - AKFBBRK-35

  • Hydraulic Drum Brakes
  • 3500 lbs Axle
  • 10 x 2-1/4 Inch Drum
  • 14 Inch Wheel
  • 14-1/2 Inch Wheel
  • 15 Inch Wheel
  • Camper
  • Car Hauler
  • Utility Trailer
  • Free Backing
  • etrailer

Free-backing, driver's-side and passenger's-side drum brakes won't engage when you reverse, even if your actuator is activated. Automotive-grade friction pads and e-coated backing plates are long-lasting. Fit 14" to 15" wheels.


  • Hydraulic drum brake assemblies are designed for use with a surge-type trailer brake actuator
  • Free-backing design lets you back up without engaging the trailer brakes, even if the actuator is activated
    • Fall-away brake shoes only anchor on drums 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 gears allow for a more precise setting
  • E-coated backing plates resist wear and corrosion
  • Single plunger design
  • Adjuster plugs (included) cover access holes to keep dirt and grime out of the assemblies and off of the shoes
  • Left-hand (driver's-side) brake assembly, right-hand (passenger's-side) brake assembly, and mounting bolts included
    • Nuts and lock washers (BRKH10B) sold separately
  • QAI and CSA certified


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

Each of these free-backing hydraulic brake assemblies 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.

These trailer brake assemblies act as part of your trailer's hydraulic braking system. A hydraulic trailer brake actuator is required for these brakes to function.

Thoroughly Tested for Safety

These brake assemblies meet the requirements for certification by the Canadian Standards Association (CSA). The CSA creates standards, which when complied with ensure a safe and quality product. These brake assemblies underwent extensive testing to measure stopping distances when braking. These brakes have 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 these brake assemblies 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.

B10H-51 AxleTek 10" X 2-1/4" LH Hydraulic Brake Assembly - Free Backing - Drivers Side - 3.5K Axles - E-Coat

B10H-52 AxleTek 10" X 2-1/4" RH Hydraulic Brake Assembly - Free Backing - Passengers Side - 3.5K Axles - E-Coat

Customer Satisfaction Score:

Customer Reviews

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

Average Customer Rating:  4.8 out of 5 stars   (384 Customer Reviews)

Free-backing, driver's-side and passenger's-side drum brakes won't engage when you reverse, even if your actuator is activated. Automotive-grade friction pads and e-coated backing plates are long-lasting. Fit 14" to 15" wheels.


Excellent perfect match for my 2005 Jayco Baja trailer. Easy peasy to install. To make it easier to get the brake line threaded in... start it prior to bolting it into place.


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


Products are great customer service well…….
ordered the product on the 10th was suppose to be here the 17th called customer service the 17th guy tells me he apologizes the warehouse guys are slacking. They were unable to locate one of the items I ordered that’s why it hasn’t shipped. Not once did anyone reach out to me to offer to substitute. I am not some weekend trailer fixer upper. That might order 2-3 things a yr. I own a trailer rental company with 12 trailers in my fleet. I asked for over night shipping to get the items Friday so I could still meet my deadline by Monday as this particular trailer was scheduled to be rented starting Monday morning the 21st for 2 weeks. Your customer service agent said sorry we can’t offer overnight shipping on this order as we would be losing money…(had someone reached out to me between the 10th and 15th I would of had my order my the 18th) ….. well because of incompetent etrailer employees. My order was shipped ground despite requesting overnight shipping I lost a $3,000 dollar rental….. Because of that I am willing to pay double for a trailer part before I order from e trailer again.

I will have our Customer Service team reach out to you.
-- Etrailer Expert Jenny N - 03/30/2022


Excellent service started when I called to ask a question about my order. She then answered all my questions and took my order. I received a follow-up call the next day to make sure of my address. I placed my order on Thursday and received my item on Tuesday. Great service all the way around. I also went to a place that builds trailers and they couldn't even get what I needed this cheap with their price.


The FREE BACKING trailer brake is the way to go. No more having to lock the system out before you back up. No more forgetting to lock the system out before backing up. Had this for a year now and it works like a champ. I love E Trailer, they have everything for my 5 trailers.


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.


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


That’s because of COVID-19 a lot of things have happened everybody don’t have a lot of money so thanks to you and your company I was able to forward what I needed to reassemble the brakes on his dolly at a reasonable price thank you and your team for all you’ve done even though it was a day late


Easy to install perfect fit good quality but didn't come with new nuts studs work great good customer service slight delay with u p s


EVERY order I’ve made at E trailer has been handled better than anyone could ask. Prices and quality of your products are a real bargain. Thank you your great customer service.


The brake kit was just as adverand very nice. I will definitely order from e-trailer again.


Everything was great accept them grease seals. Had to order them special from another source


Got everything installed and after testing, brakes are working well. I have no major complaints. Price is good. I could have spent a few extra dollars for the galvanized backing plates but this is for a boat trailer that only gets towed 25 miles or so each way to a freshwater lake once or twice a week during the summer, so I went the cheap route.

A couple of notes: spend the 5 bucks on the accompanying hardware kit (nuts and washers). I didn't, figuring that I would just use the nuts and washers off of the old plates. Problem is that the bolts on the old plates were course thread and the bolts on these are fine thread. I had to go to about 4 stores to find fine threaded bolts in the right size. I would have saved myself a couple of hours on the install if I would have ordered the hardware from etrailer.

Second, on my trailer, two of the bolts were stalled with the bolt head on the outside of the axle with the nut on the inside of the plate. With these new plates, the bolts are not removable, which meant that I had to install two of the nuts with an open end wrench rather than an impact socket because there was not enough clearance between the nut when threaded onto the bolt and the axle. Not the end of the world and even if I knew that in advance I would have still purchased this same product. But it did end up taking an extra few minutes for each axle to install the plates, so it is something that I thought that I would note here.

Just a couple of quibbles that were specific to my trailer. But if I were to do it over again, I would still purchase.

Still working fine.
Garrett T - 03/19/2021


Replacement brakes arrived in 2 days and fit perfect. Great way to get new brakes on the boat trailer. Highly recommend.


I have had nothing but problems with the backing plates. I have adjusted them about every time I have taken my boat out. One time my boat trailer locked up both tires going down the road about 35 mph. good thing it wasn't any faster or I would have been in the ditch. I'm going to change back to the Manuel lockout brakes once I can get all new drums and brakes.


Great quality product and was perfect fi


Delivered in a timely manner. one shoe had slight damage but not bad enough to complain about. Have heavy boat that I bought used 4 years ago and trailer brakes had never worked. These bolted on easily, made slight adjustments and trailer brakes now work perfectly. Should have done this a long time ago.

Very happy, will order from etrailer again if needing brake parts.


These fit perfect and were easy to inst all.


Perfect fit for our 1976 Cardinal Deluxe !!
Thanks for the speedy deliver all the way out to west coast
Studs were not long enough for lock washers to be installed
so I used some locktight on threads… good to go !


These brakes look to be of good quality’. I am Replacing possibly the original set of four on an 18 year old boat trailer. Time with tell how these hold up in the saltwater.


Perfect fit and function


Perfect fit for my boat trailer.


Shipment arrives on time as promised and they sure look good. I have a dropped axle trailer and I installed with the traditional adjuster at 6 o'clock position but with my dropped axle, I was not able to adjust the brake from outside. So I called etrailer help desk and the lady took down all my information and told me someone will call me back within 24 hours and they did and gave me a sound advice. Clock the plate so that the left adjuster will be at 9 o'clock position and right adjuster will be at 3 o'clock position. I did it yesterday, adjusted the brakes from outside, bleed the brakes and it works like it should be. Thank you etrailer and your supporting team.




I had an old trailer. DYI with this brake kit. Reran new brake lines, etc. These worked great!

Show More Reviews

See what our Experts say about this etrailer Trailer Brakes

  • What is the Bolt Spacing for etrailer Hydraulic 10 Inch Trailer Brake Kit # AKFBBRK-35
    The Hydraulic Trailer Brake Kit - Uni-Servo - Free Backing - 10" - Left/Right Hand - 3,500 lbs Item # AKFBBRK-35 has bolts spaced 2-7/8 inches apart on center (left to right and up and down). Diagonally they are spaced 4 inches apart on center.
    view full answer...
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  • When Would Free Backing Trailer Brake Assemblies be Needed on Trailer
    If your surge coupler does not have a manual or electric reverse lock out like what you described a set of free-backing plates is what you'd want to allow the trailer to back up without locking the brakes up. The part # AKFBBRK-35 would be correct set to go with if your axle is a 3,500 lb axle.
    view full answer...
  • Will the Hydraulic Trailer Brake Kit part # AKFBBRK-35 Work With 13" Wheels
    The wheel size compatibility comes from the hub/drum, but in short, yes, the Hydraulic Trailer Brake Kit part # AKFBBRK-35 works with 13" wheels. It is designed for a hub/drum 10" diameter x 2-1/4" wide which is measured inside the hub on the wear surface.
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  • Recommended Hydraulic Brake Replacement on a 2007 Master Tow Dolly
    From what I could find out about your 2007 Master Tow Dolly, the Hydraulic Brake Kit # AKFBBRK-35 should fit without issue. That being said, there wasn't a whole lot of information I could find, so it would be a good idea to double check the size of the brakes you currently have installed. If you pull one of the hubs off, you would measure the depth and diameter of the drums. They should measure 10 inches in diameter and 2 inches wide. The brakes should also have 4 bolts that...
    view full answer...
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  • How to Measure Brake Drums
    Yes, there is a measurement you can take to determine what size brakes you need and if they will fit your existing drums. You will want to measure the diameter of your drums. I have included a diagram detailing the dimensions you will need to find. If you have 10 x 2-1/4 Inch drums then the etrailer Hydraulic Trailer Brake Kit - Uni-Servo - Free Backing - 10" - Left/Right Hand - 3,500 lbs item # AKFBBRK-35 you were looking at would fit your trailer.
    view full answer...
    Image 1 for
  • Replacement Hydraulic Braking Assemblies for Master Tow Dolly with 3,500 Lb Axle
    If you're just looking for the braking assemblies then the correct kit would be the Hydraulic Trailer Brake Kit part # AKFBBRK-35 since you have a 3,500 lb axle. These assemblies are free backing so you can reverse the dolly without locking up the brakes. Please note, we don't offer universal shoes(pads) for all assemblies which is why you will need to replace the entire unit unless you can identity the exact make and model of assembly you have now. If you need anything else for your...
    view full answer...
  • Comparing Single and Dual Servo Hydraulic Drum Trailer Brakes
    The only difference between single and dual servo hydraulic drum brakes is that dual servo will provide more force while in reverse than single servo. That said, it's not much and most really don't use their brakes a ton in reverse so single servo like the Hydraulic Trailer Brake Kit part # AKFBBRK-35 are far more common. I have attached a list of our hydraulic brakes below, if you need help picking out a set I would just need your axle capacity.
    view full answer...
  • Can Hydraulic Drum Brake Assemblies be Replaced with Free-Backing Plates
    Yes, you can replace standard hydraulic drum brakes with free-backing assemblies like the part # AKFBBRK-35 that you referenced. These would work great with the A-60 actuator as well.
    view full answer...
  • Is Hydraulic Trailer Brake Kit # AKFBBRK-35 Sold in Pairs
    The Hydraulic Trailer Brake Kit # AKFBBRK-35 is sold as a set that includes a left and right hand side assembly.
    view full answer...
  • Availability of Hydraulic Trailer Brake Kit Without Mounting Studs
    For replacement hydraulic brakes you can still use the Hydraulic Trailer Brake Kit - Uni-Servo - Free Backing - 10" - Left/Right Hand - 3,500 lbs # AKFBBRK-35 you were looking at. Although this does come with mounting hardware, you can simply remove the mounting studs. They are not permanently attached to the brakes.
    view full answer...
  • Is There a Difference Between Brake Assembly Part # AKFBBRK-35-D, AKFBBRK-35R-D and # AKFBBRK-35L-D
    You are correct. We sell the assemblies as a pair as part # AKFBBRK-35-D or individually as part # AKFBBRK-35R-D and # AKFBBRK-35L-D.
    view full answer...
  • Does the Hydraulic Brake Kit Come With One or Two Brake Assemblies
    The Hydraulic Brake Kit # AKFBBRK-35-D comes with both the left hand and right hand assemblies so you just need to purchase one kit per axle. If you are needing to replace one specific brake then the left hand is part # AKFBBRK-35L-D and the right hand is part # AKFBBRK-35R-D.
    view full answer...
  • Recommended Free-Backing Hydraulic Brakes for Surge Brakes Without Reverse Lockout
    All hydraulic brake drum systems are compatible with free-backing brake assemblies like # AKFBBRK-35-D for 3500 lb axles with 10 inch drums or # AKFBBRK-7 for axles 5.5K to 7K with 12 inch assemblies. The brake lines are run to the brake cylinder that only has a single piston to allow movement in reverse without engaging the brake shoes to stop the trailer. Let me know if you have more specific fit questions.
    view full answer...
  • Replacement Hydraulic Surge Brake Brake Assembly
    You do have 2 options for the replacement brake assemblies. The Brake Assemblies # AKFBBRK-35 that you linked to is a free backing style that will not allow the brakes to be used when in reverse even when the actuator is activated. The Brake Assemblies # AKUBRK-35 will allow the brakes to be activated when going in reverse. These are the ones that you want if your Surge Brake has a manual or electric reverse lockout feature.
    view full answer...
  • What Free-Backing Hydraulic Brake Assemblies do You Recommend for My 3,500 Pound Axle?
    While we do carry the assemblies you need that will not lock when backing up, the Hydraulic Trailer Brake Kit - Uni-Servo - 10" - Left and Right Hand Assemblies - 3,500 # AKUBRK-35 will lock up. For the free-backing version that does not lock up, those are the # AKFBBRK-35. I went ahead and attached a demonstration video that highlights the features of these assemblies.
    view full answer...
  • Brake Assembly Recommendation for Boat Trailer That Allows it to be Backed up Without Brake Lockup
    Best option would be to install free-backing brake assemblies on your trailer as they allow the trailer to be reversed and not have the brakes apply. For example if you have 3,500 lb axles on your trailer you'd want the kit part # AKFBBRK-35-D which comes with assemblies for both the left and the right. These are galvanized too which helps prevent corrosion. I also attached a link below to a page that has all of the free backing plates we offer for you to check out if you have a different...
    view full answer...
  • How to Determine Which Hydraulic Brakes to Use on a Trailer
    There are two different types of hydraulic brakes used on a trailer which are disc brakes and drum brakes. A drum brake has a small round drum in which the shoes inside the backing plate push up and out to slow the trailer whereas a disc brake assembly is composed of a circular round rotor and half moon shaped caliper which clamps down on the rotor to slow the trailer. I have attached a photo of both to give you a better understanding. The part number you provided "KH8444" was manufactured...
    view full answer...
    Image 1 for
  • Can Surge Brakes be Added to Aspen Camper
    We have everything you will need to add surge brakes to your Aspen Camper. I have attached a link that will take you to our available selection of brake assemblies. You can filter through the different assemblies based on your camper's axle capacity and drum size. I have also included a detailed article on adding hydraulic drum brakes that will lay out all the components you will need to make the conversion.
    view full answer...
  • Torque Specs for Brake Assembly and Brake Actuator
    The torque specs for the Hydraulic Brake Kit # AKFBBRK-35-D are 45-70 foot lbs and for your Titan Actuator T43329007K the bolts should be tightened to 80 foot lbs.
    view full answer...
  • How to Determine Which Hydraulic Brake Assemblies for Tandem Axle Boat Trailer
    To determine which hydraulic drum brake assemblies will fit on your 2,500 pound axles you'll need to measure the dimensions of your drums. For example, if your drums are 10 by 2-1/4 inches you can use # AKFBBRK-35-D. Since you have a boat trailer I suggest getting galvanized or dacromet brakes to resist corrosion.
    view full answer...
  • Difference Between Single, Dual and Free Backing Servo Brake Assemblies
    The biggest difference between the servo styles that you'll notice is between free backing plates and the others. The free-backing plates will allow your trailer to back up without having the brakes lock up. With surge brakes typically when you go to reverse the trailer it pressurizes the brake system which locks the wheels up. Free backing setups are designed to allow the pressure to build but not activate the shoes of the assembly so the trailer can back up. Some surge brake trailers...
    view full answer...
  • How to Determine Which Drum Brakes to Get
    There are a few pieces of information that you will need to know when looking for replacement drum brakes. First of all you will need to know the weight capacity of your axle so you can choose drum brakes that will be able to safely stop your trailer. The brake mounting flange is another important thing to look at when looking for trailer brakes. The most common is a 4 bolt pattern, but there are 5 bolt patterns for trailers with a bigger weight capacity. You will also need to note...
    view full answer...
    Image 1 for
  • Proper Way to Adjust Brake Assemblies of Hydraulic Brake Kit # AKFBBRK-35-D
    The adjustment procedure you mentioned of tigthening the adjustement till you can't turn the wheel by hand and then backing off 10 clicks is the standard way to adjust brakes and would be the correct way to adjust the Hydraulic Brake Kit # AKFBBRK-35-D that you referenced. If you follow that procedure with these assemblies you'll be good. I also attached a video that shows how to adjust brakes as well. At about the 4:39 mark our installer begins adjusting the brakes.
    view full answer...
  • Replacement Hydraulic 10 Trailer Brakes for 1999 Jayco Eagle Pop Up
    I do have an option for you but we don't carry replacement brake servos for Atwood Hydraulic Trailer Brakes as they have been discontinued by the manufacturer. Therefore, you will need to replace the entire assemblies and for this I recommend the Hydraulic Brake Kit part # AKFBBRK-35-D. These brakes are free backing so you can reverse without a lockout solenoid and they have a dacroment finish which will hold up well to the elements.
    view full answer...

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