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

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

Item # AKFBBRK-35L-D
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etrailer Accessories and Parts - AKFBBRK-35L-D
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Marine-grade, free-backing, driver-side brake won't engage in reverse, even if actuator is activated. Automotive-grade friction pads are long-lasting. Dacromet-coated backing plate is supremely rust resistant. Fits 13" to 15" wheels. Call 800-298-1624 to order etrailer accessories and parts part number AKFBBRK-35L-D or order online at etrailer.com. Free expert support on all etrailer products. Guaranteed Lowest Price and Fastest Shipping for Hydraulic Trailer Brake - Uni-Servo - Free Backing - Dacromet - 10" - Left Hand - 3,500 lbs. Accessories and Parts reviews from real customers.
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  • Reviews (48)
  • Q & A (11)
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etrailer Accessories and Parts - AKFBBRK-35L-D

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

Marine-grade, free-backing, driver-side brake won't engage in reverse, even if actuator is activated. Automotive-grade friction pads are long-lasting. Dacromet-coated backing plate is supremely rust resistant. Fits 13" to 15" wheels.


  • Marine-grade hydraulic drum brake assembly is great for boat trailers
    • Designed for use with surge-type trailer brake actuators
  • 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
  • Dacromet coating on backing plate offers superior corrosion resistance
    • Ideal for use on a boat or snowmobile trailer
    • Durable enough for saltwater applications
  • Stainless steel springs are durable and rustproof
  • Aluminum hydraulic cylinder resists rust
  • 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: left hand (driver'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.

12-805 AxleTek 10" X 2-1/4" LH Hydraulic Brake Assembly - Free Backing - Drivers Side - 3.5K Axles - Dacromet Coat

Customer Reviews

Hydraulic Trailer Brake - Uni-Servo - Free Backing - Dacromet - 10" - Left Hand - 3,500 lbs - AKFBBRK-35L-D

Average Customer Rating:  4.7 out of 5 stars   (48 Customer Reviews)

Marine-grade, free-backing, driver-side brake won't engage in reverse, even if actuator is activated. Automotive-grade friction pads are long-lasting. Dacromet-coated backing plate is supremely rust resistant. Fits 13" to 15" wheels.


Replaced my left and right brake assemblies on my 2000 Jayco Eagle UDK 16, popup camper. No problem removing the 4 nuts I sprayed with penetrating oil the day before, or the hydraulic line. I used new mounting hardware BIK-00 and installed the new units without any issues. I did bleed the lines and cylinders, and the brakes really didn't need more then a few clicks to adjust, best the brakes have every worked since I owned the camper, I am the second owner. I also replaced the hitch coupler / master cylinder with a new unit from etrailer AT82543, Jayco used 4 bolts to secure it, super easy to change. Parts arrived when expected and in great condition! Thanks etrailer.com!


Parts are as described, well wrapped and arrived in great condition. Very happy with fit and product.

Very well. Fit well, easy to install
Earl R - 07/13/2020


These brakes seemed to work fine. Installation wasn’t too bad. It didn’t seem to totally solve my problem. I suspect that the surge brake actuator was what was causing the problem. I’ll never know because I sold the trailer.


I was disappointed that the new brake assy was delivered w/o the 7/16"-20 nuts and lockwashers needed for installation. My original brake assy had different size nuts. The new assy had permanently installed studs, so I had no choice, but to go to a hardware store to figure out what size nut I needed.


Perfect fit and simple to install. Pre installed studs are a great idea however the 4 nuts for those studs should be included as well. Also there is no hole to plumb a break flusher into if your trailer has one. Couple minor things but I still am extremely happy with the purchase.


The fit of these was perfect. My trailer is a 2002 so it had seen quite a few miles since it was new and I can't imagine the brakes were ever replaced given the condition. I highly recommend purchasing the hardware that goes with this and reading the instructions on proper adjustment. Along with a new actuator this has my trailer braking like new!


Stripping down a 16 year old 21 ft. salt water use trailer - from end to end. The folks @ etrailer were very knowledgeable, and helpful in my decision making. From placing the order, to tracking the order, to the way the items were packed for transit. Other distributors could learn from these people; in regards to customer service, following up, both office and warehouse. Unloaded the products last night, nothing short, all quality in regards to their products, with great pricing. The installation videos are a big bonus, and something I'll be taking advantage of, during the restoration. Will follow up with picture, (before and after) when I'm done


All in all I am happy with the package. The master cylinder hangs up sometimes which makes for some sketchy braking. If I had to do it again I would have gotten the better master cylinder.


I got a complete rebuild parts order for the surge brakes on my boat trailer. The parts are excellent quality, the shipping was prompt, the prices were great and the help and service was super. I would certainly order from etrailer again!


Ordered brake assembly, fast response & delivery time. One year later,parts are working great! Highly recommend ordering from etrailer!


Excellent product and good customer service. Shipping was fast and free. Disappointed because it did not come with the required locking nuts.


Made my trailer like-new. Etrailer support was fantastic; user friendly and professional. I'll continue doing business here.


Perfect fit, easy to get on and adjust. Sorry sold the boat and have no photos. Thanks


Easy to deal with and product was exactly what they said. Arrived on time. Will buy other parts from this company as needed


so far all in the box looks good came well packed which is refreshing don't have time at moment to install but all look correct thanks


Brakes fit as advertised. Only problem was finding the 7/16 by 20 nuts.


Just as advertised and easy to install


Just received yesterday but upon visual inspection I am very pleased with both the quality and the price.


Great price, prompt delivery and great product.


Fit on my boat perfectly. Back in actio n.


Working fine. No problems.


Product holding up well


Fast Shipping A+++++++++++++++++++++++++


Very satisfied. Correct product fast de livery.


Great product and arrived on time!

Show More Reviews

Ask the Experts about this etrailer Accessories and Parts

  • Trailer Brakes Recommendations for a 3,500 lbs Boat Trailer Axle
    You have the standard brake mounting flanges on your axle. If you want to get really technical, the bolt holes should actually measure about 1/16 larger than 2-3/4. That is the standard dimension for 3,500 lb axles. If you are looking for hydraulic brake assemblies, I strongly recommend the 10 Inch Free-Backing Dacromet Brake Assemblies, # AKFBBRK-35L-D for the left hand and # AKFBBRK-35R-D for the right hand. Free-backing brakes will not lock up when you are backing up the trailer...
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  • Replacement Boat Trailer Brakes Rated for 3,500 lbs
    Thank you for that info and I definitely recommend replacing your boat trailer's brakes and we have exactly what you need. Based on the Dexter 8-247 number you gave we know you have a 3,500 lb Dexter 10" Hub and Drum Assembly such as part # 84546UC3. For a hub and drum that size the best option is the Hydraulic Trailer Brake - Dacromet because they are designed for marine applications with their corrosion-resistant dacromet coating and mount to a 4-bolt mounting flange such as # 4-35....
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  • New Brake Assemblies, Hub/Drums, Brake Lines, and Bearing Buddy for Trailer with 3,500 lb Axle
    For as trashed as those brake assemblies are I am impressed with how spotless that spindle is! Based on the bearing numbers you mentioned you have a #84 spindle and the hub part # AKHD-545-35-G-K is correct. Since this its galvanized it's a really great option as it will fight corrosion. The flexible brake line kits like the part # 18SI-BLKIT is what I would go with. They are just as durable as anything else and a lot easier to install. The brake assemblies # AKFBBRK-35R-D and # AKFBBRK-35L-D...
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    Image 1 for Image 2 for Image 3 for Image 4 for
  • 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...
    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.
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  • Trailer Brake Actuator for Hydraulic Brakes on a Tandem Axle Trailer
    The Demco Actuator # 8605001 is rated for trailers up to 6,000 pounds regardless of the number of axles. If your trailer is heavier use # DM8608601, rated for trailers up to 8,600 pounds. The # AKFBBRK-35R-D and # AKFBBRK-35L-D brakes you've selected are for 3,500 pounds axles with a 4 bolt brake flange. For a tandem axle brake line kit you can use # DM5428.
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  • Replacement Brake Assemblies for 2003 Prestige Boat Trailer with 10 inch Assemblies
    Well we don't carry Atwood wheel cylinders so nothing we offer is going to work but I may have a better solution for you. I would recommend a 10 inch brake assembly that is free-backing like the part # AKFBBRK-35R-D for the right hand side and part # AKFBBRK-35L-D for the left hand side. These are also Dacromet coated to fight corrosion which would be a great option for you since your trailer is a boat trailer. For the price of replacement parts for brake assemblies it almost always...
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  • Recommended Brake Actuator With Lock Out for 7000 LBS. Boat Trailer
    The standard tongue weight on a trailer is approximately 10-15 percent of the GTW. On a boat trailer it generally stays at 10 percent because most of the weight of a boat is towards the back end of the trailer, reducing the need for more tongue weight. This is why all of our couplers have a tongue weight of 10 percent of the GTW. If you'd like to be more definite in your tongue weight, you can always use a scale like the Sherline Trailer Tongue Weight Scale # 5780. The Titan Zinc-Plated...
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  • Can Free-Backing Brakes Replace Non-Free-Backing Breaks on 2001 EZ Loader Boat Trailer
    You can use free-backing brake assemblies on your trailer in place of the existing non-free-backing brakes. For your 2001 EZ Loader boat trailer I recommend the Demco Hydraulic Drum Brake Assemly, Free Backing, Galvanized, for 10 Inch Brakes # 40715 for the right- hand side and # 40716 for the left-hand side. The galvanized steel will resist rust, making these assemblies great for your boat trailer. I have attached an installation video of these brakes for you. Another great option is...
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  • 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...
  • Recommended 10-Inch Brake Assembly With Aluminum Wheel Cylinder
    We have just what you are looking for. The brake I recommend is part # AKFBBRK-35L-D. This is a 10-inch brake assembly that is 2-1/4 inches thick and has an aluminum wheel cylinder. This assembly is designed for 3,500-lb axles and will work with 13, 14, and 15-inch wheels and it has a 4-bolt brake flange mounting pattern. This assembly is for the left hand(driver side) of the trailer. The brake assembly for the right hand(passenger side) is part # AKFBBRK-35R-D.
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Info for this part was:

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