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

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

Item # 23-398
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23-398 - Hydraulic Drum Brakes Dexter Axle Trailer Brakes
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7" x 1-3/4" Driver'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 23-398 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" - Left Hand - 2,500 lbs. Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (12)
  • Q & A (13)
  • Videos (1)
  • Photos
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Dexter Axle Accessories and Parts - 23-398

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

7" x 1-3/4" Driver'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: left hand (driver'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

K23-398-00 Dexter 7" Single Servo Hydraulic Brake Assembly - LH - 2.5K

Replaces 23-398

Video of Dexter Hydraulic Drum Brake Assembly - Uni-Servo - 7" - Left Hand - 2,500 lbs

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Dexter Axle Trailer Brakes 23-398 Review

Today we're gonna take a look at the Dexter seven inch left=hand driver side hydraulic drum brake assembly for 2500 pound axles. The hydraulic drum brake assemblies are designed for use with a serge type trailer brake actuator. These happen to be a uni-server design, which means it's a single plunger design. These are also manual adjustment breaks so they do require periodic manual adjustment. Right down here is the adjustment here where you'll turn the gear to adjust them in or out. Now, on the very back here, there is a access hole that they have in the backing plate that allows you to put your tool through there to adjust your brakes and, what's nice about this assembly, if you notice they have a plug in there. They do include these adjuster plugs, which will cover those access holes to keep dirt and grime out of your assembly and off the brake shoes. Now, this part does include the left-hand driver side break assembly and the mounting nuts to install it.

The dimensions on this is seven inches by one-and-three-quarter inches. The seven inches would be the diameter from this shoe to this shoe so, if we put a ruler on it, there's your seven inches. The one-and-three-quarter inches is the width of the pad on the shoes so there's your one-and-three-quarter inches. If you notice, it has the four bolts on the back so it does use a break mounting flange bolt pattern of four bolts. I've mentioned the four nuts are included to install it. This does require the use of a seven inch break drum.

The wheel size that'll fit on this assembly is the 10 inch, 12 inch and 13 inch and, again, it's inaudible 00:01:22 designed for axles rated up to 2500 pounds and this is a left-hand design and the way you can tell that . now on a new assembly it'll have this sticker there but, if that sticker wasn't there, the easiest way to tell is look at the length on the pad of the shoes. This pad goes from here to here. This one's from here to here. This is the shorter pad.

This is the longer pad. The shorter pad is always your primary shoe. That faces the front of the trailer so that tells you it goes this way. That means this is the left-hand driver side assembly but that should do it for the review on the Dexter seven inch left-hand driver side hydraulic drum break assembly for 2500 pound axles.

Customer Reviews

Dexter Hydraulic Drum Brake Assembly - Uni-Servo - 7" - Left Hand - 2,500 lbs - 23-398

Average Customer Rating:  4.9 out of 5 stars   (12 Customer Reviews)

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

- 23-398

good product worked great 909986

- 23-398

I Purchased these brakes to use On a Kimball Hauler UTV, they worked great. 884668

- 23-398

Drum brake assembly is exactly what I needed to replace some old and really worn brakes on a 1982 tent trailer. I was a bit skeptical as to if they would fit as there is no OEM parts out there but it turns out these were perfect!! 828118

- 23-398

Cheaper than everyone here in Canada, parts are the same ones sold here in Canada New brakes for 30-foot long Houseboat trailer 798327

- 23-398

One of the best projects I ever did. Love the results. Everything worked, fit and preforms as expected. The customer service helped me order the correct parts, the first time. Replaced lines, hubs, bearings, drums, brakes, everything. First Rate. 721023

Everything worked great and still does. Thanks to the help from the etrailer Team
Nathan B - 11/18/2020


- 23-398

Excellent price, came with everything needed to install, and good quality. 601307

- 23-398

No problem on installing the new backing plate. Just one two three and your done. My grandson did half the work and hes is only 11 years old. 391107

Excellent I have then on both axels on my boat trailer
Tim - 06/09/2018


- 23-398

The easiest method for repairing trailer brakes. etrailer was great will back again 181556

- 23-398

Etrailer is the best !! 153908

- 23-398

Lighting fast shipping..great product. 148917

- 23-398

Installed this on my 1995 Jayco 1206 tent trailer. Went on easily, and worked great. Had to file the edges of the shoes alittle as it was rubbing the drum but other than that was great. Once the drum is off just 4 bolts and disconnect the brake line, then adjust the pads. Easier than just changing pads alone. 141879

- 23-398

Complete, easy to install 139552


Ask the Experts about this Dexter Axle Accessories and Parts

  • Do You have a 1-Inch Hydraulic Wheel Cylinders Dexter Single-Servo Type for 7-Inch Brakes
    The correct replacement wheel cylinders for a 7-inch Dexter brake assembly would be # 54-80-4 (right hand). We don't currently have the left hand cylinder.
    view full answer...
  • Replacing Hydraulic Brake with a 7 inch Electric Brake Assembly for 2K Axles
    We do offer 7 inch electric brake assemblies that should work with your 7 inch hub/drums. They are the Electric Brake Assembly for 2K Axles for Left Side, item # 23-47 and the Electric Brake Assembly for 2K Axles for the Right Side, item # 23-48.
    view full answer...
  • Can a 1985 Palamino Trailer be Switch From Hydraulic Brakes to Electric Brakes
    If your spindle has wear, I recommend replacing it with a new spindle. The wear can become worse, not provide a good surface for the bearing/seal, and lead to other problems down the road. Better to take care of it ahead of time before it becomes a problem. I have included a link to our spindle main page for you to view. The outside diameter of a drum will be larger than the inside and larger than the measurement we use. A 7 inch diameter listed will have a 7 inch inside diameter. To...
    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...
  • 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...
  • 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...
  • Dimension Of Brake Mounting Flange For 7 Inch Electric Or Hydraulic Brakes
    It sounds like you need the brake mounting flange that needs to be welded to the axle. You will need to know the diameter of your axle to make sure you choose the correct brake mounting flange. If you have a 1-3/4 inch round 2,000 lb axle, the brake flange you need is part # 4-34. This has a 4-bolt mounting pattern with a center hole that measures 1.64 inches diameter. This will work with 7 inch brake assemblies like part # 23-398 for hydraulic and part # 23-48 for electric brakes. If...
    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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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
Installed by:
Jeff D

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