1. Trailer Brakes
  2. Dexter Axle
  3. Hydraulic Drum Brakes
  4. 2500 lbs Axle
  5. 7 x 1-3/4 Inch Drum
  6. 10 Inch Wheel
  7. 12 Inch Wheel
  8. 13 Inch Wheel
Dexter Hydraulic Trailer Brake Kit - Uni-Servo - 7" - Left and Right Hand Assemblies - 2.5K

Dexter Hydraulic Trailer Brake Kit - Uni-Servo - 7" - Left and Right Hand Assemblies - 2.5K

Item # 23-398-399
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Trailer Brakes
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Dexter Axle Trailer Brakes - 23-398-399
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7" x 1-3/4" Driver's-side and passenger's-side hydraulic trailer brake assemblies feature a single-plunger design. Mounting flanges have a 4-bolt pattern. Fit 10" to 13" wheels. Lowest Prices for the best trailer brakes from Dexter Axle. Dexter Hydraulic Trailer Brake Kit - Uni-Servo - 7" - Left and Right Hand Assemblies - 2.5K part number 23-398-399 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (13)
  • Q & A (17)
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Dexter Axle Trailer Brakes - 23-398-399

  • Hydraulic Drum Brakes
  • 2500 lbs Axle
  • 7 x 1-3/4 Inch Drum
  • 10 Inch Wheel
  • 12 Inch Wheel
  • 13 Inch Wheel
  • Dexter Axle
  • Single Servo
  • Brake Set

7" x 1-3/4" Driver's-side and passenger's-side hydraulic trailer brake assemblies feature a single-plunger design. Mounting flanges have a 4-bolt pattern. Fit 10" to 13" wheels.


Features:

  • Hydraulic drum brake assemblies are designed for use with a surge-type trailer brake actuator
  • Periodic manual adjustment required
  • 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, right-hand (passenger's-side) brake assembly, mounting bolts, and nuts included
  • Made in the USA


Specs:

  • 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


23-398 Dexter 7" Single Servo Hydraulic Brake Assembly - LH - 2.5K

23-399 Dexter 7" Single Servo Hydraulic Brake Assembly - RH - 2.5K





Video of Dexter Hydraulic Trailer Brake Kit - Uni-Servo - 7" - Left and Right Hand Assemblies - 2.5K

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




Video Transcript for Dexter Axle Trailer Brakes - Hydraulic Drum Brakes - 23-398-399 Review

Male speaker: Today, we're gonna take a look at the Dexter 7-inch hydraulic trailer brake kit, with the left- and right-hand brake assemblies for 2500-pound axles. Now, hydraulic drum brake assemblies are designed to use with surge-type trailer brake actuators. These assemblies are manual adjustment brakes, so they do require a periodic manual adjustment. Right down here is your adjustment gear, where you'd adjust them. On the backing plate, there's an access hole at the bottom that you put your tool through to do your adjustment. What's nice on these brakes, if you notice, they have an adjuster plug that goes in there when you're not using it, so that hole's covered up.

It keeps any dirt and grime from getting into your brake assembly and off your brake shoes. This part number will include both the left-hand driver's side, right-hand passenger's side brake assemblies. You can notice all the mounting nuts are included to install it. The dimensions on these assemblies is 7-inch diameter by 1 3/4-inches wide, and the size on that, the 7 inches of diameter would be from this shoe all the way over to that shoe. So if we put the ruler on, there's your 7-inch diameter. The 1 3/4-inch width would be the width of the pad on the shoe.

There's the 1 3/4 inches. If you notice on the back, there's the four bolts. That's the mounting flange bolt pattern, is a four-bolt mounting flange, and again, there's your nuts that you'd install them with. Now, these assemblies do require the use of a 7-inch brake drum. The wheel size that'll fit on these is 10-inch, 12-inch, and 13-inch.

Again, these are designed for axles rated up to 2500 pounds. The last thing I wanted to show you is, how to tell the difference between the left-hand driver's side and right-hand passenger's side. On a new assembly of course, there'll be a sticker that'll tell you that, but if that sticker wasn't there, the easiest way to tell is you look at the length of the pad on the shoes. So this pad goes from here to here, this one's from here to here. This is a shorter pad, that's the longer pad. Shorter pad always faces the front of the trailer.

It tells you that this is the right-hand passenger's side assembly. If you go over to the other one, the pad goes from here to here. This one's from here to here. This is the shorter pad, this is the longer pad. Shorter one faces the front of the trailer. This is the left-hand driver's side assembly. That should do it for the review on the Dexter 7-inch hydraulic trailer brake kit with left- and right-hand brake assemblies for 2500-pound axles.


Customer Reviews

Dexter Hydraulic Trailer Brake Kit - Uni-Servo - 7" - Left and Right Hand Assemblies - 2.5K - 23-398-399

Average Customer Rating:  4.8 out of 5 stars   (13 Customer Reviews)

7" x 1-3/4" Driver's-side and passenger's-side hydraulic trailer brake assemblies feature a single-plunger design. Mounting flanges have a 4-bolt pattern. Fit 10" to 13" wheels.

- 23-398-399
by:

Seem well built bolted up nice. Would of liked some lock washers with the kit but I had some laying around. Installed quick. 844714



- 23-398-399
by:

Everything was delivered in 2 days during covid 19 lock down. I got exactly what I ordered and happy about the free shipping. Customer service Was great and Alex went out of his way to find exactly what I need and also made other options that he thought would be best for my situation. 799456



- 23-398-399
by:

#Everything was great! 760652



- 23-398-399
by:

Product came right on time and fit perf ectly 746754



- 23-398-399
by:

After trailing for a year, I have found real peace of mind. The brakes work perfect in the city and on long trips through the mountains. No more sliding through red lights. I am trailing a 21' pontoon boat.tandum axle. I highly recommend. 710982



- 23-398-399
by:

Great service and price. Fastest shipping ever experience! Thanks! I will be back! 615651



- 23-398-399
by:

Parts were exactly as I ordered, and came with good instructions. I will definitely use etrailer for any future towing needs. 614899



- 23-398-399
by:

parts fit as expected and are of a good visual quality. made installation of rebuilt trailers a breeze 608969


Comments
Trailers are going strong no issues at all with the parts
Dave - 03/02/2020

70613

- 23-398-399
by:

as always timely deliveries. All items were correct and in good shape. 574852



- 23-398-399
by:

The replacement brakes were used on a pontoon boat trailer. Installation was fairly simple. The only problem encountered was difficulty bleeding the brake lines due to tight spacing between the new brake bleeder and the existing flexible brake line. Brakes work great . 571710



- 23-398-399
by:

Great product, easy installation, no is sues. 505817



- 23-398-399
by:

All parts fit great and delivered promptly . Hard to find 7” trailer brakes but they have a good selection of all sizes 492615



- 23-398-399
by:

Bought these for my snowmobile trailer. The studs lined up perfectly onto the brake plates. However, no lock washers were included, and the nuts were not locknuts. Further, when I added lockwashers the studs were too short and did not protrude beyond the tightened nut but instead were short by over 1/16 inch. Should work ok, but not ideal. Finally, the bleeder valves needed a 10mm socket or wrench, but the cap screw and the brake line were too close to allow access with either a socket or a wrench. Had to change them to bleeder valves with an 8 mm head. 459834


13
13

Ask the Experts about this Dexter Axle Trailer Brakes

  • How To Find the Correct Braking Assemblies and Hubs for a 1995 Jayco Eagle 10 ST
    Possibly, if there is an axle tag on your 1995 Jayco Eagle 10 ST then I can use this to determine the correct hubs and braking assemblies. If you know your axle capacity then that can be used as well but the axle tag is preferred. Based on the weight of your trailer, the Dexter Hydraulic Trailer Brake Kit part # 23-398-399 could work if your existing braking assemblies measure 7" x 1-3/4". The Dexter Trailer Hub and Drum Assembly part # 8-257-5UC3-EZ would then be a match for these and...
    view full answer...
  • Replacement Hydraulic Brakes for Pop-Up Camper
    Brakes like the Dexter # 23-398-399 that are rated for 2,500 lbs have the capacity to work with 1,800 lb axles, but to get the right brakes you'll need to know your brake's mounting flange bolt pattern as well as your drum diameter. The aforementioned Dexter brakes will work if your trailer has a 4-bolt mounting flange and your drum is 7" diameter x 1-3/4" wide. I have added a link to a help article for you to check out what you need to know to add hydraulic drum brakes to your trailer...
    view full answer...
  • Is It Possible to Add Brakes to a Trailer that Never Had Them
    Sounds like you are looking to upgrade a trailer from having idler hubs to one that has brakes. There are several things to consider and determine to do this. If you check out the FAQ article I attached you will see exactly how to add brakes to a trailer that didn't have any. You will need to remove your hubs to either get the bearing numbers or spindle dimensions so that you can determine what hubs would fit your spindle. They aren't all the same.
    view full answer...
  • Can Replacement Parts Still Be Had for Atwood Hydraulic Braking Assemblies 84210
    The Atwood Hydraulic Braking Assemblies 84210 are no longer made so replacement parts for them are not easily found. If you wanted, you could scour the internet and you might have luck finding someone with replacement parts for these in stock. That said, I would have my doubts of this since they are very old and no longer produced so the best option would be to replace the assemblies for which we have the Dexter Hydraulic Trailer Brake Kit part # 23-398-399. If you were able to find the...
    view full answer...
  • Recommended Dexter Brake Kit for 2500 lbs Dexter Axle
    For your 2500 lbs Dexter Axle you will want the Dexter Hydraulic Trailer Brake Kit # 23-398-399. These brake assemblies measure 7 inch x 1-3/4 inch, mount to a 4 bolt mounting flange, and are compatible with 10 inch, 12 inch, and 13 inch wheels. I have attached a review video that you can check out for more information. If your brakes are 10 inches x 2-1/4 inches, if you could let me know whether you have electric or hydraulic brakes I can look into those options as well. If you need...
    view full answer...
  • Recommended Brake Kit For Fishing Holdings Single Axle Boat Trailer
    For your Fishing Holdings Trailer, I recommend the Dexter Hydraulic Trailer Brake Kit - Uni-Servo - 7" - Left and Right Hand Assemblies - 2.5K # 23-398-399. These can be used with the Dexter 4 on 4 Complete Hub-and-Drum Assembly - for Hydraulic Brakes - 2,200-lb Axles # 8-276-5UC3. This assembly is for spindles with measurements of 1.063 inches for the inner diameter of both the inner and outer bearing. I've attached an article to help you measure your spindles to confirm a bearing fit....
    view full answer...
  • 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...
    view full answer...
  • Correct Replacement Brakes and Hub/Drum Assembly for '97 Jayco Popup
    The difference between part # 8-276-5UC3 and part # 8-173-16UC3 is that the 5UC3 works with a 7" x 1-3/4" brake assembly while the 16UC3 works with a 7" x 1-1/4" brake assembly brake assembly. Other than that they use # L44649 inner and outer bearings and a 10-9 grease seal that has the 1.5" inner diameter. You definitely want to go with assemblies that match your bearings so if you're able to confirm that you have L44649 bearings then I'd use one of the options mentioned above. The...
    view full answer...
  • Replacement Brakes, Hub and Drum Assembly with L44649 Inner and Outer Bearings on 2000lbs Axle
    I have a solution for you, but the # AKUBRK-35-D are 10" brakes and will be too large for the hub/drum assemblies that fit on your axle. Instead you'll want to use the Dexter # 23-398-399 which are a 7" brake assembly that can be used with wheels between 10" and 13" diameter. It sounds like you also need new hubs, so you can use the etrailer Axle Tech # AKHD-545-2-2K which are a 2000-lb capacity and have # L44649 inner and outer bearings to match your specifications. This hub and drum assembly...
    view full answer...
  • Replacement Brakes for Unknown Dexter Axle on 1987 Fleetwood 5th Wheel Trailer
    For your braking assembly you will simply need to measure your hub diameter or the backing plate on your brake assembly and the thickness of your hubs. You will either need the Dexter Electric Trailer Brake Kit - 10" - Left and Right Hand Assemblies - 3,000 lbs # K23-472-473-00 that are 10 x 1-1/2 inches or the wider brake shoe assemblies # 23-468-469 that are 10 x 2-1/4 inches. If you have 7 inch assemblies, you will want # K23-103-104-00. If you have hydraulic brakes, you will either...
    view full answer...
  • Wheel Cylinder Assemblies for 7 Dexter Brakes
    The matching wheel cylinder for 7" brakes that pairs with the # 54-80-4 is the Wheel Cylinder Assembly Kit -LH # DA24FR. These are both of the parts you need to change both of the wheel cylinder assemblies on your 7" Dexter brakes. These cylinders will fit 7" brakes like the # 23-398-399.
    view full answer...
  • Flexible Hydraulic Hose For Replacement Right-Hand Uni-Servo Wheel Cylinder 54-80-4
    The Dexter Replacement Right-Hand Uni-Servo Wheel Cylinder Assembly for 7" Brakes part # 54-80-4 is a replacement for Dexter Hydraulic Trailer Brake Kit - Uni-Servo - 7" - Left and Right Hand Assemblies part # 23-398-399. The Demco Hydraulic Brake Hose with Fittings has 1/8" fittings so they would not be compatible with the Dexter brakes. For the Dexter brakes you will need Dexter Hydraulic Flex Hose part # 18018-SF with a 3/8" fitting.
    view full answer...
  • Replacement Brakes and Hubs for 1987 Moody Boat Trailer with 7 x 2-1/4 Hydraulic Brakes
    The 4-bolt mounting pattern of 7-inch brakes is the same as for 10-inch brakes; both use bolts/holes spaced apart by 2-7/8-inches on center. Moving to larger brakes will naturally require new hubs and these new hubs must use the same set of bearings and the same wheel bolt pattern as your current ones. Also note that larger brakes and drums will be compatible with different wheel diameters than your 7-inches brakes were. The free-backing 10-inch hydraulic brakes you referenced, kit #...
    view full answer...
  • Replacement Axle with Hydraulic Drum Brakes on a 2,200 Lb Boat Trailer
    I have the perfect replacment trailer axle for your boat trailer. For this, I recommend using the Dexter Trailer Axle part # T20BTR-7258. The Dexter trailer axle measures 72" from the face of each hub and 58" from the center of each spring seat. The measurements you gave are likely the same as what is listed above because the start of each measurement could vary slightly from person to person. The outside diameter of this trailer axle is 1.75" which should be what is on your trailer...
    view full answer...
  • How to Determine Weight Rating of Dexter Trailer Axle
    The Dexter axle code P29 refers to the plant where it was made, plant 29, but this does not include capacity information. If you can find the complete serial number for the axle we can contact Dexter to find out more about it, particularly its weight rating. The 7 x 1-3/4-inch hydraulic brakes we offer, all shown on the linked page, are typically intended for axles rated for 2500-lbs, such as left- and right-hand brake kit # 23-398-399 from Dexter. For a new hub/drum we have 7 x 1-3/4-inch...
    view full answer...
  • Will 7 Inch Electric Brakes Replace 7 Inch Hydraulic Drum Brakes
    Yes, the Dexter Electric Trailer Brake Kit - 7" - Left and Right Hand Assemblies - 2,000 lbs # 23-47-48 will absolutely work as a replacement for the Dexter Hydraulic Trailer Brake Kit - 7" - Left and Right Hand Assemblies - 2,500 lbs # 23-398-399. The electric brakes measure 7" diameter x 1-1/4" wide so they are narrower than the 7" diameter x 1-3/4" wide hydraulic drum brakes, meaning they will fit in the drum; they also use the same 4-bolt mounting flange so you are set! Along with...
    view full answer...
  • Hub and Drum and Brakes for Trailer With 2,000 lb Axles & Bearings L44649
    Thanks for that great information we have exactly what you need for your 2,000 lb axles. The number you gave of 1.063 inches in diameter where your bearings ride on the spindle corresponds to Bearing # L44649. Knowing that, we can get you the correct hub and drum, which is the Trailer Hub and Drum Assembly - 2K Axles # AKHD-545-2-2K. These hub and drums work with 7" brake assemblies and for hydraulic brakes the correct assembly is the Dexter Hydraulic Trailer Brake Kit # 23-398-399....
    view full answer...




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Info for this part was:

Edited by:
Lindsey S
Installed by:
Jeff D
Expert Research:
Jameson C
Written by:
Alexander C

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