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  1. Trailer Brakes
  2. Dexter
  3. Hydraulic Drum Brakes
  4. 3500 lbs Axle
  5. 10 x 2-1/4 Inch Drum
  6. 14 Inch Wheel
  7. 14-1/2 Inch Wheel
  8. 15 Inch Wheel
Dexter Hydraulic Trailer Brakes - Uni-Servo - 10" - Left/Right - 3.5K
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Dexter

Dexter Hydraulic Trailer Brakes - Uni-Servo - 10" - Left/Right - 3.5K

Part Number: 23-312-313
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$239.40
$219.40 after $20.00 Mail-In Rebate
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Dexter Hydraulic Drum Brakes - 23-312-313
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Hydraulic drum brakes offer more powerful, controlled, and smoother braking compared to electric brakes. Works with surge-type actuators. 10" x 2-1/4" Assemblies fit 14" to 15" wheels. Made in the USA. Great Prices for the best trailer brakes from Dexter. Dexter Hydraulic Trailer Brakes - Uni-Servo - 10" - Left/Right - 3.5K part number 23-312-313 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (174)
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Dexter Trailer Brakes - 23-312-313

Highlights

  • Smooth, Controlled Braking: Hydraulic drum design delivers stronger, more consistent stops.
  • Fast Bolt-On Swap: Left and right assemblies fit 4-bolt flanges and 10" x 2-1/4" drums.
  • Long Pad Life: Bonded brake pads stay quiet and last longer than riveted shoes.
  • Clean, Reliable Operation: Adjuster plugs keep dirt and debris out of internal parts.
  • Easy Manual Adjustment: Star wheel lets you fine-tune pad contact for optimal braking.
  • Rated for 3,500-lb Axles: Works with 14"–15" wheels for standard trailer setups.
Made in USA

Features to know about

Restore Stopping Power and Smooth Control: 10" Uni-Servo Hydraulic Drum Assemblies

If your trailer brakes are dragging or weak, this Dexter kit brings them back to proper working order. The 10" x 2-1/4" hydraulic drum assemblies deliver stronger, more controlled braking than electric setups and work with surge-type actuators rated for 3,500-lb axles. Each kit includes left- and right-hand assemblies with a 4-bolt mounting pattern that fits 14" to 15" wheels.

Built for Long Service Life: Bonded Brake Pads with More Contact Area

These pads are fully bonded to the shoes instead of riveted, so there are no rivet holes cutting into the friction surface. That means more pad contact, more braking torque, and no metal scraping noise as they wear. The bonded design extends pad life and helps keep braking smooth and consistent mile after mile.

Keeps Dirt Out and Components Protected: Sealed Adjuster Plugs

Road grime and dust can shorten the life of any brake assembly. Dexter includes adjuster plugs that seal the backing plate openings, keeping the inner parts clean and free from debris. It’s a simple feature that pays off in longer service intervals and fewer maintenance issues down the road.

Dependable Operation You Can Trust: CSA-Certified Safety Testing

Each assembly meets the Canadian Standards Association certification requirements for real-world braking performance. This confirms that the brakes have been tested for consistent stopping under load, giving you confidence every time you tow.

Easy Manual Adjustment When Needed: Straightforward Star Wheel Setup

When it’s time to service your brakes, the standard manual adjuster makes it simple to fine-tune pad clearance using a brake adjustment tool or flathead screwdriver. With periodic adjustment, these assemblies stay responsive and maintain proper braking force trip after trip.

Close-up image showing how to manually adjust a trailer drum brake assembly using a screwdriver on the star wheel adjuster screw through the backing plate opening.

Specs

Dimensions

  • Dimensions: 10" diameter x 2-1/4" wide
  • Mounting flange bolt pattern: 4 bolt
  • Wheel size: 14" to 15"

Weight and Capacity

  • Axle rating: 3,500 lbs

Warranty

  • Limited warranty: 5-year

Note

  • Important: The brakes will be very hot after doing this, so after every 10 stops you'll want to wait about 10 minutes to let the brakes cool off before continuing. If you don't, you might cook and crack the pad material.

23-312 Dexter 10" Single-Servo Hydraulic Brake Assembly - LH - 3.5K

23-313 Dexter 10" Single-Servo Hydraulic Brake Assembly - RH - 3.5K





Customer Satisfaction Score:

Ratings & Reviews

4.7

174 reviews
5 Stars
(151)
4 Stars
(10)
3 Stars
(5)
2 Stars
(4)
1 Star
(4)
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by:
Great fitment and great price.
Steven
at etrailer hooked me up. They should build a statue of this man!!
by:
quick order and delivery
by:
Solid product. Great price. Incredibly fast shipping.
by:
It was quick and easy to order and love the fast delivery
by:
Excellent service.
by:
Excellent product. Bolted right up, still working fine after 1 year. Easier and cheaper than cleaning and replacing brake shoes and brake cylinders. Brake shoes were pre-adjusted!
by:
Looks like exactly what I wanted. Waiting for the snow to melt so I can install. I didn't need the extra bolts or grease caps because they were included in the backing plate and drum packages. No problem it's good to have spares. Thanks
P.S. The box with the money must have been misplaced!! HaHa
Thanks for all your help Angela
by:
I needed to replace my trailer brakes at the lake because I didn't have time to do it before I left. I ordered on a Saturday night, it shipped on Sunday, and I received it on Wednesday. Outstanding shipping service!
by:
From initial telephone call, confirming I had selected the right parts, shipment was on its way within hours, tracking the shipment was very easy, delivery in 3 days. Couldn't be happier with the service, shipping or product. Received early afternoon, both installed by 6 pm.
by:
These make changing your trailer brakes a breeze!! Thank you for the quick shipment and very easy transaction!
by:
These brake assembly arrived fast and they're exactly what I needed for my boat trailer. THANKS!
by:
well packed and fast shipping
by:
Made in USA and great quality!
by:
Everything looks great. And even early delivery. The left hand break is missing one of the 4 mounting bolts. It is a pressed in bolt that is missing. I d have all the nuts.
Katrina B. profile picture
Etrailer Expert

Katrina B.

4/8/2022

I have sent this over to our customer service department to better assist you.

by:
The correct parts and pieces, arrived ready to install. It gets no simpler!
by:
Works fine!
by:
Product worked perfectly
by:
2026 Chevrolet Colorado
by:
Great products and support is excellent. Complete purchasing process was excellent!
by:
Went together perfectly! Couldn’t have asked for any better.
by:
Exactly What I wanted
by:
Fast shipping.
by:
Quick delivery ! Love it !!!
by:
0 0
fast shipping good product
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See what our Experts say about this Dexter Trailer Brakes

  • Replacement Dexter Hydraulic Brake Assemblies for 023-344-00 and 023-345-00
    For your replacement Dexter hydraulic brake assemblies, you will want the Dexter Hydraulic Trailer Brake Kit - Uni-Servo - 10" - Left and Right Hand Assemblies # 23-312-313. These will work very well with your existing hub/drum assemblies.
    view full answer...
  • Are Dexter Hydraulic Trailer Brakes # 23-312-313 Free Backing
    The Dexter Hydraulic Trailer Brake Kit # 23-312-313 that you referenced are standard uni-servo assemblies and are not free-backing. These will not automatically disengage when going in reverse with the trailer. For 3,500 pound free-backing assemblies I instead recommend the etrailer.com Hydraulic Trailer Brake Kit # AKFBBRK-35. This kit includes both the left and right hand assemblies and they use automotive-grade friction material that's molded to the shoe. I have attached a short...
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  • Troubleshooting Hydraulic Drum Brakes on Boat Trailer Rubbing After Removing Actuator
    With your boat trailer, removing the actuator would not have caused the brakes to apply. It sounds like there is a mis-adjustment with the assembly due to either the springs or adjuster spacer not engaging correctly. I assume the lack of pressure in the wheel cylinder likely meant shifting of the brake shoes and causing misalignment. I recommend removing the hub and then removing the brake shoes, springs, and adjuster. This will remove any braking issues causing rubbing/grinding. I...
    view full answer...
  • Replacement For 3,500 lb Dexter Hydraulic Brakes 23-312 & 23-313
    Hey Tom, Really appreciate that info, and the hub you are referring to is the 3,500 lb Dexter Trailer Hub and Drum Assembly # 8-247-50UC3. We do have the 023-313-00 brake assembly that fits it, which is the right hand (passenger side) Dexter Hydraulic Drum Brake Assembly # 23-313. If you want to replace both brakes it is the Dexter Hydraulic Trailer Brake Kit # 23-312-313. Then for the grease cap bearing kit that fit your hub you'll need Grease Cap # F001518 and Hub Bearing Kit # BK2-100.
    view full answer...
  • Replacement Master Cylinder Kit for Dico Model 60 Coupler/Actuator and 10" Dexter Drum Assemblies
    We had a customer install the Titan Model 60 master cylinder kit part # T4395100 on their Dico model 60 and although the bore was a little bigger they were able to make it fit. Then for Dexter 10 inch brake assemblies we have the part # 23-312-313 for a pair of left and right hand assemblies.
    view full answer...
  • Can the Duo-Servo Demco Hydraulic Brake Kit Replace a Uni-Servo Dexter Hydraulic Trailer Brake Kit
    The Duo-Servo Demco Hydraulic Brake Kit # DMSB18794M-93M fits 10" hub and drum assemblies as well as the same mounting hole dimensions as the Uni-Servo Dexter Hydraulic Trailer Brake Kit # 23-312-313. This means that you definitely can replace them with the Duo-Servo kit. The Demco Duo-Servo kit is perfect if you have a boat trailer. The galvanized backing plates, stainless steel spring hardware, zinc-plated wheel cylinders will do a much better job at ressisting rust and corrosion from...
    view full answer...
  • Are Dexter Trailer Brake Assemblies K23-312-00 And K23-313-00 Available
    Hey James, The # T4423500-400 is slightly different because it's free-backing, has a 3,750lb capacity instead of 3,500lb capacity, and has a Galphorite finish. The K23-312-00 and K23-313-00 can be purchased with part # 23-312-313. If you're wanting a better finish to help fight corrosion since this is a boat trailer I'd go with the Hydraulic Brake Kit # AKFBBRK-35-D. These assemblies are free-backing an come with a Dacromet finish for a superior corrosion resistance.
    view full answer...
  • Is 4-Bolt Brake Flange Needed to Install 3,500 lb Hub & Drum AKHD-655-35-K
    Good question but no, the 4-bolt brake flange is not a requirement to install the Trailer Hub and Drum Assembly - 3,500-lb Axles # AKHD-655-35-K. The hub will still fit your spindle and install just fine, but you will need that 4-bolt brake flange if you were also installing brakes that fit the hub like the Dexter Hydraulic Trailer Brake Kit # 23-312-313 or Dexter Electric Trailer Brake Kit # 23-26-27.
    view full answer...
    Image 1 for
  • Converting from Surge Brakes to Electric Brakes on Trailer
    The 10.06 doesn't indicate anything in particular about your drum size or current brake assemblies. It could be a cast number or a date of some kind. The best way to find out which brakes you need is to know your axle capacity. If you aren't able to find that capacity or information on your axle, you could also measure your drum or the current brakes. For example, your standard 3,500 lb axle will use 10" x 2-1/4" brakes that fit a 4 bolt brake flange pattern like the # AKEBRK-35-SA. You...
    view full answer...
  • Recommended Brakes/Actuator That Allow Single Axle Boat Trailer to Be Pushed in Reverse by Hand
    The Dexter Brake Actuator part # T63FR which is for drum brakes has a manual lockout which means you can engage this at the coupler with a pin and this will then allow for reversing the trailer without free backing braking assemblies. This is done instantly and there should be no take-up to get the trailer to reverse like there is for free backing braking assemblies. The Dexter Brake Actuator would then pair nicely with the Dexter Hydraulic Trailer Brake Kit part # 23-312-313 and Dexter...
    view full answer...
  • What is Needed to Replace Hydraulic Drum Brakes with Disc Brakes?
    You can definitely replace your current brakes with a disk brake set up. However, there are a few things that will need to be checked and upgraded to accomplish this task. First, you will need to determine which inner and outer bearings fit your spindle. As an example, the Kodiak Disc Brake Kit - 10" Hub/Rotor - 5 on 4-1/2 - Dacromet - 3,500 lbs # K2HR35D is designed to fit spindles with an # L68149 inner bearing and # L44649 outer bearing on a 3,500 pound axle. This will also use a 5...
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  • 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...
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  • Which Hydraulic Brakes Fit the Timbren Heavy-Duty Axle-Less Trailer Suspension
    The Timbren Heavy-Duty Axle-Less Trailer Suspension # ASR35HDS02 can be used with hydraulic brakes but they will not work with the Dexter # 23-312-313. The Timbren system is designed to be used with the Dexter Trailer Hub and Drum Assembly # 8-201-9UC3-EZ and has a 5 bolt brake flange configuration. For hydraulic brakes that will fit, I recommend the Hydraulic Trailer Brake - Uni-Servo - 12" # AKUBRK-7R and # AKUBRK-7L. These hydraulic drum brakes are 12" x 2" and also have the same 5...
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  • Dexter Hydraulic Trailer Brake Assembly Mounting Bolt Size (7/16"-20)
    Hi Danny, the Dexter hydraulic brake assembly part # 23-312-313 uses 7/16"-20 mounting bolts like Mounting Bolts and Hardware for 12-1/4" Single Brake Assembly - 10,000 lbs to 15,000 lbs Part # BRKH122510S . This is the standard mounting bolt size for this 10" x 2-1/4" brake assembly. Are you thinking about making the switch to Dexter brakes?
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  • Compatibility of Hydraulic Brake Assemblies on UPF Axles
    The Hydraulic Trailer Brake Kit - Uni-Servo - 10" - Left and Right Hand Assemblies - 3,500 lbs # AKUBRK-35 will work the same as the Dexter Hydraulic Trailer Brake Kit - Uni-Servo - 10" - Left and Right Hand Assemblies - 3.5K # 23-312-313. The difference is mainly in the name brand. Either assembly will work fine on your tandem UPF axles.
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Written by:
Alexander C

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