7" x 1-3/4" Passenger's-side hydraulic trailer brake assembly features a single-plunger design. Mounting flange has 4-bolt pattern. Lowest Prices for the best trailer brakes from Dexter. Dexter Hydraulic Drum Brake Assembly - Single Servo - 7" - Right Hand - 2,500 lbs part number 23-399 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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Trailer Brakes > Hydraulic Drum Brakes > Brake Assemblies > 7 x 1-3/4 Inch > 2500 lbs Axle > Right Hand Side > Single Servo > Dexter

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

Dexter Trailer Brakes

(7 reviews)

Code:   23-399



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Shipping Weight: 4.49 pounds


Dexter Trailer Brakes - 23-399

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


  • Hydraulic drum brake assembly is designed for use with surge-type trailer brake actuators
  • Single-plunger design
  • Mounting studs included


  • Configuration: right hand (passenger's side)
  • Dimensions: 7" diameter x 1-3/4" thick
  • Mounting flange: 4 bolt
  • Axle rating: up to 2,500 lbs

Dexter Hydraulic Brake

23-399 7" x 1-3/4" Hydraulic Brake Assembly - RH

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Video of Dexter Hydraulic Drum Brake Assembly - Single Servo - 7" - Right 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 7" x 1-3/4" Right Hand Hydraulic Trailer Brakes Review

Today were going to take a look at the Dexter 7 inch hydraulic brake assembly part number 23-399. This assembly is a hydraulic brake assembly with a single servo meaning it has one piston that comes out of our wheel cylinder, pressing the shoe linings out against our drum surface. Couple this right hand side with the left hand side and its got a 2500 pound braking capacity. The reason we know this is the right hand side is because the leading shoe will always be smaller than the trailing shoe. The reason we know this is a 7 inch brake setup is you can measure across the shoe linings and see that its 7 inches.We measure the width of the shoe linings, well see its 1 and , so we have a 7 inch by 1 and inch setup. The installation is setup on a 4 bolt flange, you can see the heads of the stud go through the backing plate and come out the back, those mount to your flange on your axle.

When you initially setup, youll need to make a manual adjustment with the star wheel so that your shoe linings come out against the drum. Youll also need to maintain this which can be done through the access hole in the backing plate. As the shoe linings wear down, youll want to adjust the star wheel adjuster out so that you dont have to take up so much clearance when you hit the brakes. This will need to be done as general maintenance. And there you have it for our 7 inch Dexter hydraulic brake assembly for the right hand side, part number 23-399..

Customer Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (7 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.

- 23-399

by: PeteS08/16/2015

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

by: Scott02/10/2016

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

by: randy d02/10/2015

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

by: 7 inch overhaul09/04/2015

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

- 23-399

by: Joe H.06/10/2012

They were an exact fit! Perfect. 43581

- 23-399

by: Kevin S.07/06/2014

Complete, easy to install 139554

- 23-399

by: Hugh R08/27/2014

Great !! 148918


Ask the Experts about this Dexter Trailer Brakes
Do you have a question about this Trailer Brake?

  • 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...

  • 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...

  • Looking for a Spring Kit For Atwood Brake Shoes Part # bp04-060
  • I spoke with our technical contact with Atwood and he informed me that the springs that fit the Atwood Hydraulic Brake Shoe # bp04-060 are no longer available. Dexter has a complete hydraulic assembly that will fit your 7 x 1-3/4 requirement. The Dexter 7 x 1-3/4 Hydraulic Brake Assembly # 23-398 is for the left hand and the Dexter right hand side is # 23-399.
    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...

  • 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...

  • 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...

  • 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...

  • 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...

  • 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...

  • Replacement Brake Assemblies for a 1994 Jayco Pop Up
  • Since you have the Dexter hubs part # 8-276-5 your brake assemblies are 7 by 1-3/4 inches. The best solution I can recommend for you would be to replace the entire assemblies with the part # 23-399 for the right hand side and part # 23-398 for the left hand side. Unless you can verify that your current assemblies are Atwood I can't recommend the part # bp04-060.
    view full answer...

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Information for this part was:

Updated by:
Lindsey S
Expert Research:
Robert G
Expert Research:
Michael H
Updated by:
Laura H

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Info for this part was:

Updated by:
Lindsey S

Expert Research:
Robert G

Expert Research:
Michael H

Updated by:
Laura H

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