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  4. Hydraulic Drum Brakes
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  6. 10 x 2-1/4 Inch Drum
Hydraulic Trailer Brake - Uni-Servo - 10" - Left Hand - 3,500 lbs

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

Item # AKUBRK-35L
Our Price: $68.80
Accessories and Parts
Shipping Weight: 9 lbs
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Driver's-side hydraulic drum brake features a single-plunger design. Automotive-grade friction pads and e-coated backing plate are long-lasting. Fits 13", 14", and 15" wheels. 1-800-940-8924 to order etrailer accessories and parts part number AKUBRK-35L or order online at Free expert support on all etrailer products. Great prices and Fastest Shipping for Hydraulic Trailer Brake - Uni-Servo - 10" - Left Hand - 3,500 lbs. Accessories and Parts reviews from real customers.
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  • Reviews (212)
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etrailer Accessories and Parts - AKUBRK-35L

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

Driver's-side hydraulic drum brake features a single-plunger design. 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
  • 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: 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

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.

Compare to Dexter 23-312

12-785 AxleTek 10" X 2-1/4" LH Hydraulic Brake Assembly - Drivers Side - 3.5K Axles - E-Coat

Customer Satisfaction Score:

Customer Reviews

Hydraulic Trailer Brake - Uni-Servo - 10" - Left Hand - 3,500 lbs - AKUBRK-35L

Average Customer Rating:  4.8 out of 5 stars   (212 Customer Reviews)

Driver's-side hydraulic drum brake features a single-plunger design. Automotive-grade friction pads and e-coated backing plate are long-lasting. Fits 13", 14", and 15" wheels.


One was off center some. One had a bolt on the back keeping the assembly from flush to the axel plate. I had to cut part of the edge of the bolt to fit. The off center may not have a serious effect on braking. I got them to work and they were only $10 more than the shoes I was going to put one and got all new braking system.



Very good...


These hydraulic surge brake backing plates bolted right up and work great, I purchased both sides. I can now tow knowing that my brakes are working at 100%.


ordered about 10:30 wednsday evening and it was at my door friday afternoon. very fast shipping and great prices on it. quality was very good and install video was a big help. great purchase all the way around. i have bought from here before and has always been great service and quality products. thank you.


Appears to be a quality product, though haven’t yet driven the trailer to determine functionality. Easy install. However, was quite disappointed to have to make a special trip to the hardware store to purchase the nuts to complete the install as none of the assemblies came with them


I gave the product a 4-star review only because it did not come with lock nuts which meant that I needed to make a quick trip to the hardware store for (8) self-locking fine thread 7/16" nuts. It would be nice to include these with the brakes because the "old" nuts from the original brakes were not fine thread and would not work. The bolts in these are "pressed" in so I couldn't use the old bolts. Pressed in is better, but please consider including the nuts. As for the product assembly, quality and install, it couldn't be simpler. The videos for the install are very thorough and complete. Add the nuts and I would give these a 5-star. I have puchased other items from etrailer and they are a very good source of trailer parts.

Paul T.


Great, still working just fine

by: 04/24/2023

Great fit and quality of materials.


I have been using those complete brake assemblies on my boat trailer and think they are great! What amazed me was how easy it was to replace the old assemblies with the new ones!
I owned and operated a tire and auto store for about 40 years and have lots of experience with brakes on cars, truck, motorhomes, etc., but never used a complete brake assembly like this on a trailer. Anyone can do this and I send you a big
THANK YOU for such a great product! Keep up the good work!


Quick shipping.
I'll definitely be back
next need


As advertised! Was able to unbolt old assembly and put on new one. The old assembly had bolts that came through the back plate and nuts on the brake pad side. New assembly had bolts pressed onto the brake assembly facing inward so the nuts were on the inside. Top bolts were close to the axle, but no issues as the nuts went on with no problem. Had to use an open end wrench to tighten, as I did not have a thin wall socket.


I purchased more than just the indicated brake wheel assembly. It was a quick install and has performed well. The boat trailer doesn't get used often enough, but when it is used to tow in up to 120 degrees across the So. Cal. deserts it's comforting to know all new parts won't leave me stranded


Ordered new hydraulic brake system for trailer product was exactly as ordered extremely fast shipping and great competitive price.


Exact replacement for my trailer with 3500lb. axle. Fit and finish are great, and easy to adjust and bleed the brake cylinder. Would recommend, and would definitely buy products from again.


Fit right on my axles.
Much cheaper
than rebuilding old brakes!
Now I need to repair brake lines.
Picture of old brake.


Product quality was very good for price,
quoted delivery ($xx.xx) for three days took 6 days, had it come on time or shipping cost been adjusted, would have rated higher.


Parts arrived in excellent condition,fast shipping and I found the pricing was very reasonable. Looking forward to assembling. Will go to Etrailer first for all my needs.


parts came within 3 days. fit right on my boat axle. would use them again+++++


After I order the parts it took a long time to ship. After it was shipped I got them quite


Good God..reliable products, fast service and great people...why would you go anywhere else???


Part almost fit as received. Had to pull two studs and reverse them to make it fit as there wasn't enough room for the nut on the inside. Not an issue with other RH side. Works fine.


Right stuff at the right price


Very easy install the left side was a little tight with studs included


My items came very quickly and were reasonably priced, making my brake rehabilitation project affordable and completed already.


Came in as on time. Great condition and fits great. Thank you I will always get my parts from you.



arrived a day early than expected! parts fit perfectly! awesome!

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See what our Experts say about this etrailer Accessories and Parts

  • Hydraulic Brake Assembly Recommendation for Trailer with 10 inch Diameter Drums
    Yes, the hydraulic brake assembly part # AKUBRK-35L is the correct assembly you need for the left side of the trailer. For a set that includes both sides of the axle what you need is the part # AKUBRK-35. These assemblies are for the standard 10 inch brake assemblies that are found on 3,500 lb axles.
    view full answer...
  • Is There Left and and Right Hand Version of Trailer Brake Assembly # AKUBRK-35R
    The brake assembly part # AKUBRK-35R is a right hand assembly. If you wanted the left hand version you'd want the part # AKUBRK-35L as these are not ambidextrous.
    view full answer...
  • Do Hydraulic Brake Assemblies Come with Bleeder Valves
    The bleeder valve is already installed on the # AKUBRK-35L that you referenced. You would remove the orange cap off of it, unscrew when needed when bleeding, and then tighten back down once the bleeding is over.
    view full answer...
  • Free Backing Hydraulic Brakes for a 3,500 Lb. Axle
    The Hydraulic Trailer Brake Kit part # AKUBRK-35 (part # AKUBRK-35R + part # AKUBRK-35L) does not have a free backing design. They have a single servo design which means you would need a reverse lockout on your trailer coupler in order to reverse the trailer. Instead, you will want to use the Hydraulic Trailer Brake Kit part # AKFBBRK-35 which does have a free backing design and will allow you to reverse without a reverse lockout.
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  • Solution for Needing New Brake Pads for 1996 Stratos Duel Axle Boat Trailer
    To pick out replacement brake pads I'll need to know the brand of the brake assemblies you have to see if we can get you setup with replacements. Or if you'd be willing to replace the assemblies I would just need the size of the assemblies or the axle capacity and we can pick them out much easier. Due to the age of your trailer it will probably be easier to go by assemblies. Often times they assemblies aren't that much more than the shoes/pads too we've found. You will want to measure...
    view full answer...
  • For Dual Axle Trailers Does it Matter Which Assembly Goes on Front Axle or Rear Axle?
    No. There won't be a difference in the # AKUBRK-35R from front to back, but there is a difference between the Left and Right Hand assemblies. This particular brake is for the right hand side (passenger) of the trailer. The corresponding brake for the driver's side would be # AKUBRK-35L or you can buy the complete set with # AKUBRK-35. For dual axle trailers you'll need 2 of each assembly as well as 2 sets of mounting hardware (lock washers and nuts) # BRKH10B since these brakes do not come...
    view full answer...
  • How To Determine Your Trailers Axle Capacity
    In order to determine your trailer's axle capacity, you will need to do 1 of 3 things. The first option you have is located on the manufacturer's sticker or etched into the center of the axle. The next option you have is to remove the hub assembly and locate the bearing numbers on the inner diameter of the bearings. I have attached a help article to assist you with this. The last option would be to call the trailer manufacturer with your VIN. For a general rule of thumb, 3,500 lb. and...
    view full answer...
  • Mounting Bolt Spacing and Center Hole Size for etrailer 10 Inch Hydraulic Trailer Brake Assembly
    I went out to the warehouse to take some measurements of brake assembly # AKUBRK-35R-D. The bolts are spaced 2-7/8 inches apart on center (side to side and up and down). The center hole is approximately 3 inches in diameter. The matching left side brake assembly is # AKUBRK-35L-D.
    view full answer...
    Image 1 for
  • What is the Hole Spacing for Mounting etrailer 10 Inch Hydraulic Trailer Brake # AKUBRK-35L-D
    The mounting holes on trailer brake assembly # AKUBRK-35L-D are spaced 2-7/8 inches on center left to right and top to bottom which is the standard for 4 bolt 10 inch brake assemblies and flanges. I have included a link to a video review of this brake for you. The matching right side is # AKUBRK-35R-D
    view full answer...
    Image 1 for
  • Will the 10" Hydraulic Trailer Brakes Fit a 2004 EZ Loader Tandem Axle Boat Trailer
    In order to determine if the Hydraulic Trailer Brake part # AKUBRK-35R for right hand side or part # AKUBRK-35L for left hand side will fit your 2004 EZ Loader Boat Trailer you will first want to confirm that you have hydraulic brakes which is more than likely the case. Then, you will want to know your axle capacity which can be found on the centerline of the axle. These assemblies are rated for use on axles up to 3,500 lbs. Once the axle capacity is confirmed you will then want to measure...
    view full answer...
    Image 1 for
  • Replacement Brakes For A Boat Trailer With No Salt Water Use
    Yes, The Hydraulic Trailer Brake # AKUBRK-35R can be used on your boat trailer and will give you no problems when submerged. The # AKUBRK-35R is the right hand side. The left hand side # AKUBRK-35L is the matching set needed. The mounting bolt spacing is a 4 bolt and has 2-7/8 inches between each bolt. The brakes are 10 inch in diameter and 2-1/4 inches wide, and have an axle rating of 3,500 pounds. Nuts and lock washers # BRKH10BS are sold separately. I attached a review video link below.
    view full answer...
    Image 1 for
  • What Are Mounting Bolt Hole Sizes For Replacement Hydraulic Trailer Brakes
    The hydraulic trailer brake you referenced, Item # AKUBRK-35L, fits 4-bolt flanges with a 2-7/8-inch hole spacing and is suitable for use on a 3500-lb axle. It fits the driver's side and brake mounting bolts are included. For the passenger side, use Item # AKUBRK-35R. Nuts and lock washers are sold separately and are available in brake mounting hardware kit Item # BIK-00 (one kit needed per wheel). I recommend the Brake Adjustment Spoon Item # W80630 as well. Links with additional information...
    view full answer...
  • Replacement Hydraulic Brake Assemblies and Bearings for 3,500 lb Trailer Axle
    The trailer brake assembly part # AKFBBRK-35R that you referenced is a correct option for your trailer based on what you mentioned. It would work even though you don't have free-backing plates currently but if you didn't want that option you could use the # AKUBRK-35R instead with the matching left hand side # AKUBRK-35L. Then for a bearing kit that would have the correct bearings and seal you'd want the part # BK2-100.
    view full answer...
  • Parts Needed to Add Hydraulic Drum Brakes to 3,500 lb Axle
    The only solution that's a slip on brake system for a trailer idler hub would be a disc brake setup. So to go to a hydraulic drum setup you'd have to get new hub drums and brake assemblies. Which for that you'd need the # AKHD-5475-35-K with the brake assemblies # AKUBRK-35L and # AKUBRK-35R.
    view full answer...
  • Replacement 10 inch Trailer Brake Assemblies for Bayliner Boat Trailer
    For ten inch trailer brake assemblies we have the etrailer pat # AKUBRK-35R for the right hand side and part # AKUBRK-35L for the left hand side. Regardless of what brand assemblies you have installed currently these will replace them and work great.
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  • Replacement Brake Assemblies for Escort Boat Trailer
    You need to measure the inside portion of your hub drum. You need the width and depth like in the picture I attached. I can almost guarantee that you have 10 inch assemblies based on the 4 bolt mounting pattern though. So for free backing assemblies you would want the part # AKFBBRK-35R-D for the right hand side and part # AKUBRK-35L-D for the left.
    view full answer...
    Image 1 for Image 2 for
  • 3,500 lbs. Axle with Hydraulic Drum Brakes Kit
    I have a solution for you but unfortunately we do not carry any axles that come with hydraulic brakes. What you will need to do is buy the parts separately, but I have all the parts you will need. First, for an axle, you will need the Dexter Axle Beam with EZ Lube Spindles # T3584F-EZ-8974. This axle is 89" long with a weight capacity of 3,500 lbs. which is the same as the # e43SR Axle you were looking at. For your Hydraulic Trailer Brake Assemblies you will want the etrailer Left Hand...
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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C

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