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Dexter Hydraulic Drum Brake Assembly - Uni-Servo - 7" - Right Hand - 2,500 lbs

Dexter Hydraulic Drum Brake Assembly - Uni-Servo - 7" - Right Hand - 2,500 lbs

Item # 23-399
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Dexter Axle Trailer Brakes - 23-399
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7" x 1-3/4" Passenger's-side hydraulic trailer brake assembly features a single-plunger design. Mounting flange has 4-bolt pattern. Fits 10" to 13" wheels. Call 800-298-8924 to order Dexter Axle accessories and parts part number 23-399 or order online at etrailer.com. Free expert support on all Dexter Axle products. Guaranteed Lowest Price and Fastest Shipping for Dexter Hydraulic Drum Brake Assembly - Uni-Servo - 7" - Right Hand - 2,500 lbs. Accessories and Parts reviews from real customers.
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  • Reviews (11)
  • Q & A (12)
  • Videos (1)
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Dexter Axle Accessories and Parts - 23-399

  • Trailer Brakes
  • Hydraulic Drum Brakes
  • Dexter Axle
  • Brake Assembly
  • 7 x 1-3/4 Inch Drum
  • RH
  • Single Servo
  • 2500 lbs

7" x 1-3/4" Passenger's-side hydraulic trailer brake assembly features a single-plunger design. Mounting flange has 4-bolt pattern. Fits 10" to 13" wheels.


  • Hydraulic drum brake assembly is designed for use with a surge-type trailer brake actuator
  • Periodic manual adjustment required
  • Adjuster plug (included) covers access hole to keep dirt and grime out of the assemblies and off of the shoes
  • Mounting bolts and hardware included
  • Made in the USA


  • Application: most standard hub-and-drum assemblies, including Dexter, Lippert (LCI), and AL-KO
  • Configuration: right hand (passenger's side)
  • Dimensions: 7" diameter x 1-3/4" wide
  • Mounting flange bolt pattern: 4 bolt
  • Wheel size: 10", 12", and 13"
  • Axle rating: up to 2,500 lbs
  • Limited 5-year warranty

K23-399-00 Dexter 7" Single Servo Hydraulic Brake Assembly - RH - 2.5K

Replaces 23-399

Customer Reviews

Dexter Hydraulic Drum Brake Assembly - Uni-Servo - 7" - Right Hand - 2,500 lbs - 23-399

Average Customer Rating:  4.8 out of 5 stars   (11 Customer Reviews)

7" x 1-3/4" Passenger's-side hydraulic trailer brake assembly features a single-plunger design. Mounting flange has 4-bolt pattern. Fits 10" to 13" wheels.

- 23-399

Thanks so much for finding this part for me. I had looked everywhere. 799653

- 23-399

Cheaper than everyone here in Canada, parts are the same ones sold here in Canada New brakes for 30-foot long Houseboat trailer 801221

- 23-399

Easy direct bolt on installation. Great warranty service. 568644

- 23-399

Purchased complete backing plate, shoes, cylinder, and hardware as a single assembled unit for both sides of trailer. They fit my Jayco trailer, with Dexter axle, perfect. The shoe mounting and return springs are the same as car drum brakes. The original Atwood spring system is very inferior to this replacement unit. Parts were delivered fast and worked perfect. As always, I can count on this Companies great parts and service. Thanks, Ken, from snowy Minnesota. 469257

- 23-399

Perfect fit however it does not come with the adjustment plug. My old one was missing so now I have to try to find one locally. Other than that great communication from etrailer and fast shipping. Thank you. 237484

- 23-399

Found what I needed, called in to verify. Quick shipping and most important, as described. 223985

- 23-399

Installed easily, quality was good. Doesn't come with the stud nuts, glad I could reuse the old ones. Also doesn't come with new adjustment hole plug. These are standard parts with auto brake assembly kits. I would buy this again. 219593

- 23-399

I ordered a brake assembly for my dexter axle. It was a perfect match. The shipment was promised In two days and I received it in a day and a half. Thanks again 173153

- 23-399

Great !! 148918

- 23-399

Complete, easy to install 139554

- 23-399

They were an exact fit! Perfect. 43581


Ask the Experts about this Dexter Axle Accessories and Parts

  • Availability of Replacement Wheel Cylinder for Atwood Hydraulic Brakes
    As you probably noticed Atwood is no longer in the actuator and brake assembly business so any spare parts are becoming extremely difficult to find. We do not currently have any replacement wheel cylinders that would work with your existing Atwood assemblies. The Dexter RH Wheel Cylinder # 54-80-4 that you referenced would unfortunately not be compatible. The only option I can offer, and really your best solution, is to replace the brake assemblies themselves. Even though your current...
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  • Options to Add Brakes to Personal Watercraft Trailer
    The parts needed to add hydraulic surge drum or disc brakes to a trailer are covered in the two linked articles, one for drum brakes and one for discs. Among the parts needed is a surge coupler that will compress under the pressure of the trailer's forward momentum and push hydraulic fluid through the brakes lines to the drum or disc brakes. These articles will give you a good sense of the scope of the project and its cost. I linked our main page for surge couplers, both types, and your...
    view full answer...
  • 7 x 1-3/4 Hydraulic Brake Assembly Replacement
    You can replace the Atwood hydraulic brake assembly with the Dexter hydraulic brake assembly as long as the mounting bolt pattern on the assembly matches. I went to the warehouse and measured the Right and left Dexter, 23-399 and 23-398, Hydraulic Brake Assemblies and they have a 2-7/8 inch on center four bolt pattern.
    view full answer...
  • How To Determine Right and Left Side of Dexter Hydraulic Drum Brake Assemblies
    If you look at the wheel cylinder of the brake assemblies part # 23-399 and # 23-398 you'll see the letters L and R stamped on them. The R means right hand side and L means left. I attached a picture that points out the letter. Right side means passenger Left side means driver.
    view full answer...
  • Can Dexter Hydraulic Drum Brakes be Used in Place of Atwood 7 x 1-3/4 Inch Brakes
    There should be no problem going with Dexter hydraulic drum brakes # 23-399 and # 23-398 in place of the Atwood brakes. You just have to make sure that you have the correct mounting pattern for the Dexter brakes. The Dexter brakes mount on a 4 bolt flange. The holes are 2-7/8 inches apart on center. The center hole is 1.64 inches in diameter. If this matches your flange then you can use the Dexter brakes.
    view full answer...
  • Hub and Drum and Bearing Kit to go with 7 x 1-3/4 Inch Hydraulic Brake Assembly 23-399
    I believe that in the question you are referring to the 1.64 measurement is on the brake mounting flange, # 4-34. The center hole of the brake assembly, # 23-399, is larger than this and that is normal so it doesn't sound like you have anything to worry about for that. The matching left hand brake assembly is # 23-398. For a hub and drum assembly you can use # 8-276-5 which has a 4 on 4 bolt pattern and you would use bearing kit # BK1-150. For a 5 on 4-1/2 bolt pattern you can use hub...
    view full answer...
  • Aluminum Car Trailer Restoration and Replacement Brake Recommendations
    Thanks for the feedback, and I am glad that you are finding our website helpful! For your 1989 Trailex CT-7031 all aluminum trailer with the specifications that you provided there are three options for restoring or replacing the brakes for this trailer. The three options are similar to what you mentioned, and are: 1.Hydraulic Drum, which is the most cost effective. 2.Hydraulic Disc, which is more expensive, but provides better performance. 3.Electric drum, which is most cost effective...
    view full answer...
  • Can 7 Inch Hydraulic Trailer Brake Drums be Used with Electric Brakes
    The Dexter hubs for hydraulic brakes # 23-399 and # 23-398 indicate that they are for use with hydraulic brakes only so you would not use them with electric brakes. The inside surface where a brake magnet would stick (called the armature surface) is not the correct design for electric brakes. In order to go to electric brakes you would also need to change the hubs. To keep the same bolt pattern you can use hub # 8-173-16UC3. And then you would need brake assembly # 23-48 for the right...
    view full answer...
  • Parts Needed to Change Hydraulic Trailer Brakes Over to Electric Brakes on a 1997 Jayco Tent Trailer
    You will need two of the 7 inch electric brake assemblies, one right hand, # 23-48, and one left hand, # 23-47. You will also need an appropriate length of 10 gauge wire, item # 10-2-1, for running the wires to the trailer connector at the trailer coupler. Next, you will need a trailer connector to match the wiring on your vehicle, or the wiring you will need to install on your vehicle, to activate the electric brakes. I would recommend the Pollak trailer connector, item # PK12706, for...
    view full answer...
  • Brake Line Kit Recommendation for Dexter Brake Assemblies 23-398 and 23-399
    Trailer brakes use the same thread size whether they are disc or drum. The Kodiak Hydraulic Brake Line Kit # 20TA-BLKIT that you referenced would work well with the Dexter drums # 23-398 and # 23-399.
    view full answer...
  • Adding Brakes to Acme Car Dolly
    We don't offer parts specific for the Acme tow dolly, but we have the parts you'd need to add either electric or hydraulic drum brakes. I'm assuming your tow dolly doesn't currently have brakes, and that your current hubs use the # L44649 as the inner and outer wheel bearing. If that's the case, to add electric brakes, you'd need the following parts: # 8-257-5UC3-EZ hub drum for EZ lube spindle or # 8-257-5UC3 for standard spindles # 23-47 and # 23-48 electric brake assemblies # H20044...
    view full answer...
  • Installing Hydraulic Trailer Brakes on a Kristi Utility Trailer
    There are two ways to go. Drum brakes and Disc brakes. To determine which assemblies will fit on your spindles we will need to know the inner and outer bearing and seal part numbers. We will also need the Brake Mounting Flange bolt pattern on the spindles and the bolt pattern and size of the wheels that are on your trailer. For the hydraulic actuator we will need the size of the trailer tongue where the actuator will mount. If you will get back to me with your choices and the needed...
    view full answer...

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Info for this part was:

Updated by:
Lindsey S
Updated by:
Laura H
Updated by:
Sarah W
Updated by:
Alexander C
Expert Research:
Robert G
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Installed by:
Jeff D

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