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  1. Trailer Brakes
  2. etrailer
  3. Hydraulic Drum Brakes
  4. 5200 lbs Axle
  5. 6000 lbs Axle
  6. 7000 lbs Axle
Hydraulic Brake Kit - Uni-Servo - Free Backing - Dacromet - 12" - Left/Right Hand - 5.2K to 7K

Hydraulic Brake Kit - Uni-Servo - Free Backing - Dacromet - 12" - Left/Right Hand - 5.2K to 7K

Item # AKFBBRK-7-D
Our Price: $206.29
Trailer Brakes
Shipping Weight: 29 lbs
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Marine-grade, free-backing hydraulic drum brakes won't engage in reverse, even if your actuator is activated. Automotive-grade friction pads are long-lasting. Dacromet-coated backing plates resist rust. Fit 14-1/2" to 16-1/2" wheels. Great Prices for the best trailer brakes from etrailer. Hydraulic Brake Kit - Uni-Servo - Free Backing - Dacromet - 12" - Left/Right Hand - 5.2K to 7K part number AKFBBRK-7-D can be ordered online at or call 1-800-940-8924 for expert service.
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etrailer by AxleTek Trailer Brakes - AKFBBRK-7-D

  • Hydraulic Drum Brakes
  • 5200 lbs Axle
  • 6000 lbs Axle
  • 7000 lbs Axle
  • 12 x 2 Inch Drum
  • 14-1/2 Inch Wheel
  • 15 Inch Wheel
  • 16 Inch Wheel
  • Marine Grade
  • Free Backing
  • Manual Adjust
  • Single Servo
  • etrailer

Marine-grade, free-backing hydraulic drum brakes won't engage in reverse, even if your actuator is activated. Automotive-grade friction pads are long-lasting. Dacromet-coated backing plates resist rust. Fit 14-1/2" to 16-1/2" wheels.


  • Marine-grade hydraulic drum brake assemblies are great for boat trailers
    • Designed for use with surge-type trailer brake actuators
  • 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
  • Dacromet coating on backing plates 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 cylinders resist rust
  • 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 and right-hand (passenger's-side) brake assembly included
    • Mounting bolts and hardware (BRKH12) sold separately
  • QAI and CSA certified


  • Application: most standard hub-and-drum assemblies, including Dexter, Lippert (LCI), and AL-KO
  • Dimensions: 12" diameter x 2" wide
  • Mounting flange bolt pattern: 5 bolt
  • Wheel size: 14-1/2", 15", 16" and 16-1/2"
  • Axle rating: 5,200 lbs, 6,000 lbs, and 7,000 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.

B12H-73 AxleTek 12" X 2" LH Hydraulic Brake Assembly - Free Backing - Drivers Side - 5.2K, 6.0K, 7.0K Axles - Dacromet Coat

B12H-74 AxleTek 12" X 2" RH Hydraulic Brake Assembly - Free Backing - Passengers Side - 5.2K, 6.0K, 7.0K Axles - Dacromet Coat

Customer Satisfaction Score:

Customer Reviews

Hydraulic Brake Kit - Uni-Servo - Free Backing - Dacromet - 12" - Left/Right Hand - 5.2K to 7K - AKFBBRK-7-D

Average Customer Rating:  4.9 out of 5 stars   (201 Customer Reviews)

Marine-grade, free-backing hydraulic drum brakes won't engage in reverse, even if your actuator is activated. Automotive-grade friction pads are long-lasting. Dacromet-coated backing plates resist rust. Fit 14-1/2" to 16-1/2" wheels.


I bought these new for less than the local brake materials shop quoted me to rebuild the old brakes. They have a nice coating that should resist rust for awhile. They seem to slow the trailer well. I would buy them again.



They are working like they should. I ran 800 miles in one day about a month ago, no worries on the trailer end. With the surge brake, just hit the truck brake a little harder and the trailer starts braking also.


Very helpful staff. I did all 4 breaks and bearings complete. Glad I checked things out, seals were gone and one wheel had bearings that failed and I was lucky I made it home. Also put on new brake lines and master cylinder, all good now. Tnks



Working great! Dont overgrease your bearing buddys!


Purchase these units as part of my trailer overhaul. These bolt on in the original holes without a problem, very easy to install, added new kodiak brake lines and new drums, very pleased thus far with the product. like it's all one easy set up. I was going to buy new brakes and associate parts but after seeing these and the price I chose this route after than busting my knuckles trying to mess with springs and stuff. highly recommend


Items were correct! Two boxes to ship the items. First box was damaged and required tape to keep the contents in tack. Second box was not damaged and contained two assembled backing plates. The right plate was missing parts (found in bottom of box) and the pin holding one of the shoes on was bent in two different directions. Had to straighten the pin in order to reassemble the plate and brakes.

Etrailer Expert

Katrina B.


I am sorry to hear that your item arrived missing some parts. I see that our customer service department has sent you out some replacements. They should be arriving some time this next coming week. Once you have received your replacement order, we would love to hear your feedback.


After the old backing plate was removed from my 20 year old boat trailer, the installation of the new backing plate and break assemble took less then one hour . The drum with the bearings installed slid right on .


I Purchased hydraulic drum Brakes - Uni-servo backing plates form Lisa D at etrailer. I could not be more pleased. The items arrived when they were supposed to and were exactly what they were supposed to be. Lisa was very professional and knowledgeable, and followed up through email. I needed the items fast, and even after priority shipping, the cost was less than i could have found elsewhere. I will use etrailer again should the need arise.

Jeff B.


I am very pleased with the brake system. It is installed and functioning very well on a heavy duty equipment trailer which is often called upon to haul in excess of 10,000


Had an issue with a bolt loose in 1 of the brakes but entire assembly was quickly replaced by etrailer and it turned into a great experience.


Delivery was on time and correct application. Packing could be better as parts shifted and tore through box.


Time will tell, have had issues with them right away. Not sure if it is something I did wrong or faulty components. Have a scheduled service to determine cause of issue.

Etrailer Expert

Jenny N.


I can understand that you would want the brakes to work right away. Can you tell me more about the issues that you had with them? Was the service company able to determine what was going on?


Great on phone help….. OK was very impressed that the 2 ladies I talked with on 2 different calls really knew their STUFF. Very impressed and ordered on Sat. del. on Wed. with tracking sent to me. Will be back when I break these in with new salt water.


Great product easy installation very happy with product


As far as I can tell, everything will work. The box holding the left & right backplates looked like it had been dropped. I checked the box and found that one of the plates springs had broken loose. My husband fixed it. Maybe they should put into bigger box.


Fit perfectly and great price!



Good quality product at a good price. Also very helpful


Just one of the many satisfied customers with the company etrailer. I have used this on line site to refurbish my used boat trailers over the last 10 + years. During this pandemic I sort of let my trailer sit around and just wait until the end is near to react and make the trailer road worthy. After 3 years in out of salt water (mostly in) you might get this. After acquiring new brakes and drums from etrailer it’s back to the salt water again. Thanks for the essential workers at etrailer George, Savanna, and Carol. Cheers


First time order with and can't say enough about the experience. The website is top-notch, from excellent product description video presentations, easy order process and even visuals to provide shipping progress. Excellent assistance on product application and great follow-up customer service. Will not hesitate to order from etrailer in the future. Brakes are excellent quality and build and perfect fit.


Good quality parts and materials and/or coatings that will resist the salt water corrosion. Easy swap in for the old parts. I was replacing a set where one brake pad was cracked (the new ones are bonded instead of riveted) and one where the hydraulic cylinder had blown out and drenched everything in brake fluid. Well worth the cost and well worth the additional cost for corrosion resistance if you launch in salt water.


I have been using eTrailer for two years, Customer service is great, I could also easily reach technical support for issues with installation. They also respond to emails!


I was initially concerned about finding the right parts as the trailer was fairly old. etrailer had just what I needed. The website is so elegant. I was able to find the right parts quickly and with comparative options to make a final selection. The how-to videos are great. This made installation a little more comfortable. Especially when you do not perform this type of work every day. The parts were of high quality and are working as expected. I highly recommend etrailer for any of your trailer needs.


Easiest brake job I ever did! Complete assembly bolted to the trailer in the original position. No fussing around. Connected brake line, bled brakes and was rolling again. With free shipping, I couldn't go wrong.


The brake arrived kit sooner than I expected. Christen was very helpful with the order. I mounted them on the trailer this weekend and I will try them tomorrow


I received some great advice and help from Leeza in selecting the correct product for my needs. Without serial numbers or identifiable model numbers on my existing trailer parts, she was able to determine the correct parts for my particular trailer needs (on a 25 year old trailer.whose manufacturer is no longer in business).
I received the parts in the time span indicated upon ordering, and they fit perfectly.
A good experience all around.


The crew over etrailers work their butt off I ordered the wrong 12 inch backing plate with shoes it was already loaded on the truck they went out and pulled it from the truck and did not charge me and reordered and sent the right product it a ride fast


real nice fast service. the parts are great, like everything


They have been working great since inst all.



Brakes are still functioning well.

Show More Reviews

See what our Experts say about this etrailer Trailer Brakes

  • Availability of 12 inch Surge Brake Assemblies
    We do have 12 inch drum brake assemblies that are designed for surge brakes like the part # AKFBBRK-7-D that is Dacromet coated and comes with a left and a right hand assembly.
    view full answer...
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  • Selecting Replacement Free-Backing Hydraulic Brakes for Tandem 6K Trailer
    Trailer brakes are left- and right-hand specific but not front and back. So for a tandem 6K axle setup you'll use two left-hand and two right-hand 12 x 2-inch free-backing hydraulics brake assemblies. For a high value-for-the-dollar option I like the AxleTek brake pair # AKFBBRK-7-D. All choices are shown on the linked page. We label our brakes left and right, but you can always use the rule that the shorter of the two brake pads on the assembly should face forward.
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  • Availability of 7k Trailer Brake Assemblies that are Free-Backing
    We have 7k rated brake assembly sets like the part # AKFBBRK-7-D which are free-backing but none that have the hand brake option.
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  • Are New Hubs/Drums Required To Use the Hydraulic Brake Kit AKFBBRK-7-D
    If you replace the braking assemblies with the same size you currently have then you won't need new hubs and drums as well. The Hydraulic Brake Kit part # AKFBBRK-7-D measures 12" diameter x 2" wide which is standard for a 5,200 lb - 7,000 lb axles so as long as that is what you have then you won't need to replace the hubs and drums as well.
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  • Is It Worth It To Convert Surge Brakes On 1999 Jayco Eagle To Electric, Or Get New Surge Brakes?
    It's definitely way less work to keep what you have, surge brakes, than it is to convert everything to electric. Personally I'd just stick with surge brakes, as the only benefit you really get to electric brakes is the adjustability of the brake controller, and I don't think you'll see a big enough benefit to justify the cost. You'll need to know what size brakes your hubs take by either getting a part number from the hub, or measuring the inside dimensions shown below. The most common...
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  • What is Difference Between Uni Servo and Duo Hydraulic Brake Assemblies for Trailer
    Uni servo and duo servo is basically the style of wheel cylinder. It basically puts pressure on either side of the cylinder. The styles are interchangeable so if you have one style over the other you can go with either style. As long as your drum size is 12 inch and your axles are 5.2k to 7k the part # AKFBBRK-7-D would fit and work well.
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  • Why Does Trailer with Surge Brakes Lock Up Brakes When Reversed
    This is one of the quirks of surge brakes which is why they make reverse lockouts to allow the trailer to be reversed. If you had a Titan actuator for example you'd want the lock out solenoid part # T4748800. If you have a different brand let me know. If the brakes are drum there might be a set of free-backing plates you could swap to that would allow the trailer to be backed up as well. If you had 12 inch drums you'd need the set part # AKFBBRK-7-D or if you had 10 inch part # AKFBBRK-35-D.
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  • 12" Hydraulic Brake Replacement for Karavan US-4100-78-SSB-ST Trailer
    Based on my research, your Karavan US-4100-78-SSB-ST trailer uses standard 12" x 2" drums, so for a set of hydraulic brakes, I recommend the Hydraulic Brake Kit - Uni-Servo - Free Backing - 12" - Left/Right Hand Assemblies part # AKFBBRK-7 (black powder coat finish) or part # AKFBBRK-7-D (dacromet finish). These are compatible with 5,200 lb, 6,000 lb and 7,000 lb axles. For the mounting bolts and hardware, you can use part # BRKH12.
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  • 12 inch Free Backing Hydraulic Brake Assembly
    Brake Assemblies like the Hydraulic Brake Kit - Uni-Servo - Free Backing - 12" - Left/Right Hand Assemblies - 5.5K to 7K item # AKFBBRK-7 will have the description in the title that the brakes are free backing. We also offer the same size free backing brakes in different finishes. Demco Hydraulic Brake Kit - Free Backing - Galvanized - 12" - Left/Right Hand Assemblies - 7K item # 42029-28. Hydraulic Brake Kit - Uni-Servo - Free Backing - Dacromet - 12" - Left/Right Hand - 5.2K to 7K...
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  • Can Hydraulic Drum Brake Kit # AKFBBRK-7-D be Used with Electric Over Hydraulic Actuator
    Yes, the Hydraulic Brake Kit # AKFBBRK-7-D that you referenced will work with electric over hydraulic actuators. For drum brakes the best actuator is the Hydrastar part # HBA-12 as we have found that it reacts very quickly and is very reliable.
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  • Troubleshooting Brake Adjustment Wheel that Wont Adjust with Brake Spoon
    It looks like your adjustment star wheel is fully retracted to the point it might be too tight to adjust with a brake spoon like # W80630. With the hub off see if you can get the star wheel to break free so that it can start to adjust out. Maybe try grabbing the star wheel with a set of channel locks to really get decent leverage on it. You should be able to see the inner threads like in the picture I attached.
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  • Solution for Manually Locking Out Brakes on Actuator With Electric Lockout
    If you have an actuator like the Dexter # T4750620 you looked at, the only way to lockout the brakes is with the electric lockout. If you have a different model it is possible it has a spot for a key on the side like the # DX94FR which would work with an actuator like the # DX56FR. If you do not have this, there is still a solution for your problem. Although you can't manually lockout the actuator, you could add free-backing brakes to your trailer. These eliminate the need for the lockout...
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  • Replacement Drum and Disc Brake Kits for Tandem Axle Boat Trailer Used in Salt Water
    We can help you with new brakes for your tandem-axle boat trailer that is used in a salt water environment. We offer both electric and hydraulic drum brakes. Electric brakes are more and more supplied as the OEM equipment on boat trailers. This is mostly due to their lower cost and generally far simpler installation than hydraulic brakes. However, we do not have any drum brakes of either type with stainless steel construction. We DO have disc brake kits with stainless components and...
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  • 12 Inch Trailer Brakes for 12,000 lb Triple Axle Boat Trailer With Electric Hydraulic Drum Brakes
    For your triple axle boat trailer with electric over hydraulic brakes that is rated for 12,000 lbs I recommend the Hydraulic Brake Kit # AKFBBRK-7-D because they are dacromet coated which means they are going to resist rust, which is perfect for use on a boat trailer. These brakes measure 12" diameter which is the size you said you needed (they are also 2" wide) and will fit a 5-bolt brake mounting flange. The only thing you will need are Mounting Bolts and Hardware for 12" Brake Assemblies...
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  • Recommended Replacement Hydraulic Brake Assemblies for 7000-lbs Axle on Boat Trailer
    To replace the 12"x 2" hydraulic brakes on your boat trailer I recommend using the Hydraulic Brake Kit - Uni-Servo - Free Backing - Dacromet - 12" - Left/Right Hand - 5.2K to 7K # AKFBBRK-7-D, which are Dacromet plated for use on boat trailers and will work on your 7000-lbs axles. These are also free-backing brakes, so you'll be able to back up without worrying about engaging the trailer brakes. These brakes do not come with mounting hardware included, but you can add that with the Mounting...
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  • Determining Boat Trailer Drum Brake Size With an Measurement of 14" Across The Backing Plate
    The diameter of a drum brake is measured inside the hub so your 14" outer diameter is most likely a 12" drum brake. Depending on the age of your axles on your trailer I may be able to look up what the manufacturer installed on the axle by the serial number. This is generally found on the tag in the center of the axle. If you are only looking for a replacement brake assembly this is generally determined by the weight capacity of the axle. The Hydraulic Brake Kit # AKFBBRK-7-D fits on 5,200-7,000lb...
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  • Replacement Brake Assemblies for Boat Trailer Hub with 6 Lug Bolt Pattern
    Based on what you mentioned it sounds like you are in need of a 12 inch brake assembly set like the etrailer set part # AKFBBRK-7-D. This is a hydraulic drum brake set that is free-backing which means that your surge brakes won't activate when reversing. This is a 7k axle set.
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  • Replacement 12x2 Free Backing Surge Brakes with Part 023-342-00
    Thank you for the photo! Since your current drum brake assembly is part 023-342-00 from Dexter Axle the replacement brake kit for both sides of your axles is part # 23-342-343. You will need one kit for each axle on your trailer. These are free backing 12" x 2" brake assemblies from Dexter Axle. Attached is a review video for you to check out as well.
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  • Replacement 12" Hydraulic Drum Brake Replacements for a 1999 MasterCraft Boat Trailer
    We have a few options to replace your 12" x 2" hydraulic drum brakes which you can see listed below: - Uni-Servo # AKUBRK-7 - Uni-Servo Free Backing # AKFBBRK-7-D - Duo-Servo # 23-336-337 I'm also linking a sample installation video for you to check out.
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    You are correct. Since your boat trailer has an electric lockout solenoid you will not be able to use the Trailer Valet RVR9 Remote-Controlled Trailer Dolly - Wireless Remote - 9,000 lbs # TVRVR9 without the brakes being applied. Instead what you can do is replace your current brakes with free backing brakes which will make it where you do not need the reverse lockout solenoid. To do this you will need to know what size brakes are on your boat trailer. If you have 8-1/2" brakes we have...
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  • Replacing Hydraulic Drum Brakes on 1991 EZ Loader Boat Trailer
    To determine the correct hydraulic drum brakes to replace those on your 1991 EZ Loader two axle boat trailer, you will want to measure the drum behind the wheels. Based on the pictures you sent and the information you provided, the axles on the trailer are most likely either 3,500 or 5,200 pound axles. Using this, along with the the fact that the axle has a 5 bolt mounting flange, the compatible replacement is most likely going to be hydraulic brakes rated for 5,200 pound axles. I recommend...
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  • Parts Needed To Add Hydraulic Surge Brakes To Trailer With Lippert Electric Drum Brakes
    I only see that Dexter/Titan offer an electric lockout # T4853220 or no lockout # T4848600 on their surge brake actuators. Since you have electric drum brakes on his axles those will need to be changed out for hydraulic. You should consider then using free backing brakes like the Hydraulic Brake Kit # AKFBBRK-7-D then you will not need any lockout as the brakes will not engage when driving in reverse. If you can give me the axle serial numbers and length to coupler I can determine what...
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  • Hydraulic Drum Brake Actuator and Brakes for Dexter 8-201 Hub and Drum on Boat Trailer
    I have added a link to a help article on everything you need to replace (or add) hydraulic drum brakes, but let's start with the actuator. What you need to know is the weight capacity you need, the hitch ball size you are coupling to, and the size of your channel to mount the coupler (though there are also couplers for A-frames, though it doesn't sound like that's what you have). For example, the Titan Zinc-Plated Brake Actuator - Drum Brakes # T4079200 has an 8,000 lb capacity, couples...
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  • Replacement Backing Plates and Brake Lines for an EZ Loader Boat Trailer
    Thanks for the photo! I called EZ Loader and they were able to give me the information I needed based on your VIN. In order to replace the backing plates you are going to want to use the Hydraulic Brake Kit part # AKFBBRK-7-D. In order to replace the drums you are going to want to call EZ Loader directly as we do not carry the correct ones for your trailer. However, if you just need the bearings you can use part # LM67048 for both the inner and outer. If you are also looking to replace...
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Written by:
Alexander C

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