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 - 12" - Left/Right Hand Assemblies - 5.5K to 7K

Hydraulic Brake Kit - Uni-Servo - Free Backing - 12" - Left/Right Hand Assemblies - 5.5K to 7K

Item # AKFBBRK-7
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Our Price: $196.45
Trailer Brakes
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etrailer 12 x 2 Inch Drum Trailer Brakes - AKFBBRK-7
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Free-backing, driver's-side and passenger's-side 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 14.5" to 16.5" wheels. Lowest Prices for the best trailer brakes from etrailer. Hydraulic Brake Kit - Uni-Servo - Free Backing - 12" - Left/Right Hand Assemblies - 5.5K to 7K part number AKFBBRK-7 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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etrailer by AxleTek Trailer Brakes - AKFBBRK-7

  • 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
  • Free Backing
  • Brake Set
  • etrailer

Free-backing, driver's-side and passenger's-side 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 14.5" to 16.5" 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 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-51 AxleTek 12" X 2" LH Hydraulic Brake Assembly - Free Backing - Drivers Side - 5.2K, 6.0K, 7.0K Axles - E-Coat

B12H-52 AxleTek 12" X 2" RH Hydraulic Brake Assembly - Free Backing - Passengers Side - 5.2K, 6.0K, 7.0K Axles - E-Coat

Customer Reviews

Hydraulic Brake Kit - Uni-Servo - Free Backing - 12" - Left/Right Hand Assemblies - 5.5K to 7K - AKFBBRK-7

Average Customer Rating:  4.9 out of 5 stars   (100 Customer Reviews)

Free-backing, driver's-side and passenger's-side 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 14.5" to 16.5" wheels.


Thank you the review is they Bolt right up I was about to buy Wheel cylinders, shoes and hardware! STOP! Buy the complete units you're going to be happy you did! etrailer you Rock!


They installed easily and worked perfectly after some miles I adjusted them and they stop confidently.


The order was delivered in a timely manner and product was as expected...thanks.


My trailer brakes arrived on schedule completely assembled and ready for installation. In 2 hours I had new trailer brakes on my boat trailer working great. Thanks for the great service!

My trailer brakes are still working great. Havent had to give this repair a second thought. Thanks
David V - 11/01/2018


Got the 12" backing plates, have yet to install them. My past experience with Etrailer has been excellent! I am rebuilding a large boat trailer and they have had everything I needed to complete the job with great videos on how to install each component. They are the gold standard for an online business!


This brake kit has not been used yet. We are building up a trailer. The mechanic looked them over and says they are great. Thank you!!!


12" hydraulic drum brakes arrived protected in a well packaged box. Brakes were just as described and very easy to install. I have no hesitation ordering from etrailer again.


The product was very good with minor shipping damage. I believe it would be better to ship in one box per axle instead of four backing plates in one box, that is where the damage came from. Your people were very friendly,& easy to work with. The product was exceptional quality.


Brake parts were awesome quality.Web site was easy to navigate.Shipping was fast. I highly recommend and will do business again!


Ordering was simple, shipping as promised, fit was perfect and products are still in use. Couldn't ask for more.


Very good products no problems thanks for everything


Worked perfectly.


Quick delivery, good price, perfect match and fit. Thank you!


Great service


perfect fit


Very helpful on the phone and everything ordered fit perfectly! Thanks for all the help.









by: 02/23/2021


Detailed description and fast delivery


Show More Reviews

Ask the Experts about this etrailer Trailer Brakes

  • Recommended Brake Assemblies For 5,200lb Axles On A 22' Express EZ Load Boat Trailer
    No, 5200lb - 7000lb brakes are 12" diameter while 3500lb brakes are 10" diameter. You'll need to go with some brakes like the Hydraulic Brake Kit - Uni-Servo - Free Backing - 12" - Left/Right Hand Assemblies - 5.5K to 7K # AKFBBRK-7 if you have hydraulic brakes or the Electric Trailer Brake Kit - Self-Adjusting - 12" - Left and Right Hand Assemblies - 5.2K to 7K # AKEBRK-7-SA for electric brakes.
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  • Replacement 12 inch x 2 inch Hydraulic Trailer Brakes with Parking Brakes
    While we do have a parking brake solution for you, unfortunately you can't add parking brakes to a set like the Hydraulic Brake Kit # AKFBBRK-7 that doesn't come with parking brake levers. Instead you need the kit # T2351300-200 that has parking brake levers included.
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  • How To Determine If Your Trailer Has Free-Backing Brake Assemblies When Replacing a Surge Coupler
    To find out if you have free backing brakes, there are really only two ways I can think of to test. First, if your coupler works, you can push your surge coupler to move your trailer in reverse. If the brakes apply, then you know you do not have free backing brakes. If you can move it easily, then your brakes are free backing. If your coupler is broken and thus the reason you are replacing then you will need to go to the second testing option. You will need to pull one of your hubs...
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  • Recommended Electric Over Hydraulic Conversion for Dutchmen Voltage 3818 Toy Hauler Triple Axle
    We do have the ability to convert your Dutchmen Voltage 3818 to Electric over Hydraulic brakes. First you will want the brake assemblies and for those, I recommend the Hydraulic Brake Kit - Uni-Servo - Free Backing - 12" - Left/Right Hand Assemblies - 5.5K to 7K # AKFBBRK-7 (one kit per axle). Then you will need brake lines like the Deluxe Hydraulic Line Kit - Tandem Axle - Drum # 9579-2 along with the Hydraulic Line Kit, 3rd Axle - Drum and Disc # 9579-01. Then I recommend the HydraStar...
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  • 12 inch Brake Assembly Recommendation for Trailer with Hydraulic Brakes
    We carry 12 inch trailer brake assemblies for hydraulic setups. For a set that includes both sides we have the # AKFBBRK-7 which will be a great option. This kit is designed for axles with capacities between 5.5k and 7k.
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  • Adding Electric Over Hydraulic Drum Brakes to a Trailer
    With 6,000 pound axles they must take 12 x 2 inch assemblies. For a left and right side pair of assemblies you can use # AKFBBRK-7. We do not have an option for self-adjusting brakes in this size with a single-servo design. For an actuator I recommend the Hydrastar # HS381-9066. This unit is rated to 1,200 psi so it provides a little extra kick above the 1,000 psi units. Since you have a couple of 6,000 pound axles you're going to want the best to slow the loaded trailer down. It also...
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  • Recommended Hydraulic Brake Assemblies, Actuator, And Brake Lines For Dual Axle RV
    For your conversion to hydraulic brakes on your 7,000 lb dual axle RV, I recommend the Hydraulic Brake Kit - Uni-Servo - Free Backing - 12" - Left/Right Hand Assemblies - 5.5K to 7K # AKFBBRK-7. These assemblies are side specific and are labeled for you. These will work with your current hub and drum assemblies. For installation and adjustment, you will want the Brake Adjustment Spoon for Drum Brakes # W80630. If you need the mounting bolts for these assemblies, I recommend # BRKH12. If...
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  • Free-Backing Uni-Servo Hydraulic 12 x 2-inch Brakes for Military Trailer
    The Hydraulic Brake Kit # AKFBBRK-7 is a set of left and right free-backing uni-servo hydraulic brakes rated for use on axles with weight capacities from 5200 to 7000-lbs. These 12 x 2-inch brakes use a 5-bolt mounting pattern to bolt to your brake flanges. You'll want to confirm that the axle rating falls within the range noted, that the mounting pattern matches too and that your wheel diameter falls in the compatible range of 14-1/2 to 16-1/2-inches.
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  • Recommended Hydraulic Brake Assembly for Trailer with 5 Bolt Mounting Flange and 15" Wheels
    Because you have a 5 bolt brake mounting flange on the axle, you will most likely have a 12" brake assembly on there. For an axle with a capacity of 5000-lbs to 7000-lbs I recommend using the Hydraulic Brake Kit - Uni-Servo - Free Backing # AKFBBRK-7. These will give you a reliable, free-backing 12" brake assembly that will work well and will be appropriately sized based off the information you've mentioned. These brakes do not come with mounting hardware so you will also need # BRKH12...
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  • Recommended Brakes for 4300-lbs Axle with 5 Bolt Mounting Flange and 15" Wheels
    Yes. The Hydraulic Brake Kit - Uni-Servo - Free Backing - 12" - Left/Right Hand Assemblies - 5.5K to 7K # AKFBBRK-7 will work for you since they're designed to work with a 5 bolt brake mounting flange and your 15" wheels. This is a free backing set of brakes and will fit inside your existing drums.
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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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  • Is It Better To Replace 12 x 2 Trailer Brake Shoes Or Replace The Entire Assembly?
    The difference between the Titan Replacement Brake Shoes # T4798400 and # T4807700 is which brake assemblies the kits fit on. The # T4798400 fits brake assemblies # T4489600-500 where the # T4807700 fits discontinued braking assemblies T4203000. Both of the kits are per wheel and in general there is not a large cost difference between the replacement shoes and complete replacement braking assemblies. Due to that we recommend going ahead and replacing the entire braking assemblies...
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  • Replacement Trailer Brakes and Drums for a 5,200 lb Axle
    Your 3 inch axle is likely a 5,200 lbs axle based on the bearing sizes you referenced. The Trailer Hub and Drum Assembly - 5.2K and 6K E-Z Lube Axles - 12" - 6 on 5-1/2 - Pre-Greased # AKHD-655-6-EZ-K or the Trailer Hub and Drum - 5,200-lb to 7,000 lb E-Z Lube Axles - 12" - 8 on 6-1/2 - Galvanized # AKHD-865-7-G-EZ-K depending on the bolt pattern needed. If you will use electric brakes, I recommend the Electric Trailer Brake Kit - Self-Adjusting - 12" - Left and Right Hand Assemblies...
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  • Replacement Axle and 5 Spoke Utility Hubs for Older Triple Axle Trailer
    The Dexter Trailer Hub and Drum Assembly - 6,000-lb and 7,000-lb Axles - 12" - 5 Spoke Utility # 8-174-5UC3 are the only hubs we have with that bolt pattern to fit your wheels. Based on the measurements you gave, you will then use the Dexter Trailer Axle Beam with E-Z Lube Spindles - 89" Long - 6,000 lbs # 8327830. From the sound of where you measured to the center of your tire, any offset if you have one won't be much and will work with this combination. Then if you have electric...
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  • Parts Needed to Change a Triple Axle Kaufman Trailer from Electric to Electric Over Hydraulic Brakes
    To change your electric brakes on your Kaufman trailer to an electric over hydraulic (EOH) system you will need to hydraulic brakes, brake lines, an EOH actuator, a breakaway kit (which you should already have), and a brake controller (which you should already have). I highly recommend going with the HydraStar EOH Actuator # HBA-12 which is one of the best options out there and has received great reviews from other customers. We hardly ever see any troubleshooting questions about these...
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  • Recommended Replacement Surge Coupler for ATWOOD 82541 and Brake Assemblies
    The Atwood 82541 you referenced was discontinued a while back. The replacement I recommend is the Brake Actuator with Manual Lockout - Bolt On - Drum - 2" Ball - 7,500 lbs # T63FR. Then for your EZLoader drum brakes I recommend the Hydraulic Trailer Brake Kit - Uni-Servo - Dacromet # AKUBRK-35-D if you have 10 inch drums or the Hydraulic Brake Kit - Uni-Servo - Free Backing # AKFBBRK-7 for 12 inch drums.
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  • How to Find Replacement Drum Brake Assembly for Boat Trailer
    I can tell you exactly how to find compatible drum brake assemblies, though I took a look and could not find any type of reference to Dico 40511. To determine the brake assemblies that will fit your 2002 Escort boat trailer, you need to know your axle's weight capacity, your mounting flange bolt pattern and the inside diameter and depth of your drum. For example, Hydraulic Brake Kit # AKFBBRK-35-D are rated for 3,500 lb axles, have a 4-bolt mounting flange pattern and measure 10"...
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  • Which Hubs Fit the Timbren Heavy-Duty Axle-Less Trailer Suspension # TASR35HDS06 with 2" Lift
    The hubs that fit the Timbren Heavy-Duty Axle-Less Trailer Suspension # TASR35HDS06 use inner bearing # 25580, outer bearing # 15123, and a grease seal with a 2-1/4" inner diameter. For regular hub use part # AKIHUB-655-6-EZ-K but if you are wanting to incorporate brakes then you want hub and drum part # AKHD-655-6-EZ-K with the brakes # AKEBRK-7-SA for electric or # AKFBBRK-7 for hydraulic. I have attached some installation videos that you can reference as well.
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  • Troubleshooting Brakes Locking Up When Backing on New Tandem Axle Trailer
    It sounds like your new tandem axle trailer has a surge brake coupler. You will need to use the manual lockout on the coupler if there is one or add a Replacement Solenoid Valve for Titan Brake Actuators with Reverse Lockouts # T4748800. This electric lockout connects to a 5-way trailer plug like # HM47890, and an adapter like the Tow Ready 4 Pole to 5 Pole Trailer Wiring Adapter # 20036 will connect to the reverse light circuit at your tail light to send a signal to that solenoid to...
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    Image 1 for Image 2 for
  • Replacement Hubs, Brake Assemblies, and Tire/Wheel Combination for Old Trailer With Dexter Axles
    I have replacement hub, brake, and tire/wheel options to replace what you have on your Dexter axle. They will fit the spindle measurements that you sent me of: A is 3" B is 2.125" C is 1.75" D is 1.25" E is 1" The replacement hub and drum assembly that fits that spindle is the Dexter Trailer Hub and Drum Assembly # 42866UC3. With this assembly you will need to purchase the grease seal # GS-2125DL which has the smaller I.D. of 2.125 inches. If you have E-Z Lube spindles on your...
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    Image 1 for Image 2 for Image 3 for Image 4 for
  • Recommended Trailer Axles for 83 Inch Wide Car Trailer
    With an 83 inch frame, the spring locations could be at multiple points. If you are replacing axles, you will need to know your dimensions for the hub face to hub face length, the spring locations center on center, and the weight capacity you need. We do not carry any through axles that will fit your application, but we do have an Axle-less system that will work for you and you don't need the dimensions listed above. If 7,000 lb axles work for your application, I recommend the Timbren...
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  • Recommended Electric Lockout or Free Backing Brake Assemblies for Surge Brake Actuator
    The Titan Zinc-Plated Brake Actuator - Drum - 2-5/16" Ball - Bolt On - 8,000 lbs # T4079200 does not have a manual lock-out. Because of this, it is recommended to use an electric lockout like # T4748800 or free backing brakes so that you can back your trailer without activating the trailer brakes. You can use the Hydraulic Brake Kit - Uni-Servo - Free Backing # AKFBBRK-35-D for 10 inch assemblies or # AKFBBRK-7 for 12 inch assemblies.
    view full answer...
  • How Do I Determine Which Hydraulic Brake Assemblies to Use on My Trailer
    If you can check the specs on your axle and determine the capacity, that's going to be the easiest way to find out what brakes you need. If you've got a 3500-lbs axle (or smaller) you'll likely have 10" brake assemblies and can use something like the # AKFBBRK-35, which are a free backing hydraulic brake assembly. Since these assemblies do not come with mounting hardware you'll need mounting hardware # BRKH10B. If you've got a 5000-lbs or larger axle you'll need a 12" brake assembly...
    view full answer...
  • Can One 7K Timbren Axle-Less Suspension System Replace Two 3.5K Torsion Axles
    As far as capacity goes you could switch out two 3,500 pound axles for one 7K Timbren Axle-less system such as # TASR7KS01. You would have to place the Axle-Less system right in the middle of where the two axles used to be to make sure the trailer load is properly supported. You will also need different hubs, wheels, and tires since everything will need to be rated high enough on just the one axle. The hub and drum assembly that is compatible is # 42866UC3-EZ. If the trailer has hydraulic...
    view full answer...
  • 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...
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  • Best Parts to Convert a Trailer with 7k Drum Electric Brakes to Electric Over Hydraulic Disc Brakes
    We have a really great kit for converting a trailer with electric brakes to electric over disc brakes with the Hydrastar # HSE7K-T1. This comes with the best components for converting your trailer to electric over hydraulic disc brakes. I also attached a link to a page on converting a trailer to this style of brakes for you to check out as well.
    view full answer...

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Info for this part was:

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