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  1. Trailer Brakes
  2. Dexter
  3. Hydraulic Drum Brakes
  4. 12000 lbs Axle
  5. 12-1/4 x 5 Inch Drum
  6. 16 Inch Wheel
  7. 16-1/2 Inch Wheel
  8. 17 Inch Wheel
  9. 17-1/2 Inch Wheel
Dexter Hydraulic Trailer Brakes - Duo Servo - 12-1/4" - Left/Right - 12K
Dexter

Dexter Hydraulic Trailer Brakes - Duo Servo - 12-1/4" - Left/Right - 12K

Part Number: 23-408-409
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$855.49
Trailer Brakes
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Dexter Hydraulic Drum Brakes - 23-408-409
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These brakes automatically adjust as you tow so you don't have to crawl around on the ground to do it manually. Dual-plunger cylinder offers great braking power. 12-1/4" x 5" Assemblies fit 16" or larger wheels. Made in the USA. Great Prices for the best trailer brakes from Dexter. Dexter Hydraulic Trailer Brakes - Duo Servo - 12-1/4" - Left/Right - 12K part number 23-408-409 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Dexter Trailer Brakes - 23-408-409

  • Hydraulic Drum Brakes
  • 12000 lbs Axle
  • 12-1/4 x 5 Inch Drum
  • 16 Inch Wheel
  • 16-1/2 Inch Wheel
  • 17 Inch Wheel
  • 17-1/2 Inch Wheel
  • Standard Grade
  • Dual Servo
  • Self Adjust
  • Dexter

These brakes automatically adjust as you tow so you don't have to crawl around on the ground to do it manually. Dual-plunger cylinder offers great braking power. 12-1/4" x 5" Assemblies fit 16" or larger wheels. Made in the USA.


Features:

  • Self-adjusting brakes let you maintain optimal braking power at all times
    • Ensures reliable contact between the brake shoes and drums
    • Prevents uneven wear on brake shoes
    • Allows for the perfect setting thanks to the fine-tooth star gear
  • Smooth, consistent braking
    • Minimizes stuttering and brake lockup thanks to tapered edges on pads
    • Provides more consistent braking compared to riveted pads because pads are fully bonded to shoes
  • Dual-plunger cylinder provides more braking power than uni-servo cylinders
    • Designed for use with surge actuators that have reverse lockouts
    • Reduced chances of uneven pad wear
  • Left-hand (driver's-side) and right-hand (passenger's-side) brake assemblies included
    • Mounting bolts and hardware (BRKH12) sold separately
  • Made in the USA


Specs:

  • Dimensions: 12-1/4" diameter x 5" wide
  • Mounting flange bolt pattern: 7 bolt
  • Wheel size: 16" or larger
  • Axle rating: 12,000 lbs
  • Limited 5-year warranty


Get More Power with Duo Servo Brakes


A close up image of a Dexter hydraulic drum brake showing its duo-servo plunger.

A dual-plunger cylinder, like the one featured in these Dexter brakes, might not seem like much, but it provides more consistent, throttled braking compared to a single-plunger alternative. This is because it pushes out both brake shoes at the same time.


Just keep in mind that, because you'll be getting full braking power when driving in reverse, your actuator should have a reverse lockout on it. Otherwise, you won't really be able to back up without locking up the brakes.


High-Quality Brake Pads

The superior quality of these pads is largely due to the fact that they're bonded to the shoes, not just nailed down. Riveted brake pads will always give you a screeching reminder to replace your brake shoes. That's because the rivets will scrape against your drum as the friction material wears down. You won't have that noisy problem with bonded brake pads. You'll also get a little more friction pad contact because there aren't any cutouts for rivets. And more friction means more stopping power.


A close-up shot of a drum brake shows a tapered brake pad.

These pads are also tapered, which should help to prevent any broken, crumbly bits of material from rotating inside the drum as the pads wear over time. Brakes without these tapers are more likely to create a jarring braking experience that could cause the brakes to stutter and lock up.


Self-Adjusting Brakes Don't Require Routine Maintenance

With typical drum brake assemblies, you need to manually adjust them every now and then to make sure you're getting the shortest stopping distances every time you tow.


A close-up shot of a Dexter self-adjusting brake assembly calls attention to the adjuster cable.

With self-adjusting brakes, though, you'll always have peak stopping power - simple as that! As the brake pads wear over time, a tensioning cable will automatically keep the pads in alignment so they'll consistently make contact with your drum when you brake. You won't have to do tedious manual adjustments anymore.


How to Break In New Brakes

Once you get these assemblies installed, and your lines flushed with fresh fluid, you'll need to break in these brakes. First, find a long stretch of road or a big, empty parking lot. Speed up to about 40 mph and brake to slow to about 20 mph. Repeat this 15-30 times. The goal is to get the brake shoes properly seated into your drum. You'll know you've done that when it feels less jerky (and more consistent) each time you apply the brakes.


Note: 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.



23-408 Dexter 12-1/4" Duo-Servo Hydraulic Brake Assembly - LH - Self Adjust - 12K

23-409 Dexter 12-1/4" Duo-Servo Hydraulic Brake Assembly - RH - Self Adjust - 12K




California residents: click here


Ratings & Reviews

4.8

87 reviews
These brakes automatically adjust as you tow so you don't have to crawl around on the ground to do it manually. Dual-plunger cylinder offers great braking power. 12-1/4" x 5" Assemblies fit 16" or larger wheels. Made in the USA.

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See what our Experts say about this Dexter Trailer Brakes

  • What is Warranty of 8k Dexter Brake Assemblies
    Hey Amka, the Dexter Brake Assembly set part # 23-408-409 that you referenced have a limited 5 year warranty? Do you have this set currently?
    view full answer...
  • Can I Use Dexter Components on Lippert Axles and Vice Versa?
    You're not going to have any problems mixing Dexter and Lippert components on trailer axles over 10k-lbs in the same manner as below 10k-lbs as long as the measurements on the replacement parts are the same- i.e. bearing sizes are the same, etc.. This happens quite often in our shop repairs where we'll use Dexter Brakes like the # 23-408-409 on a Lippert Axle. When doing this, as mentioned above, you will want to make sure that you're using the correct capacity components with parts that...
    view full answer...
  • Process to Convert Trailer from Air-Over-Hydraulic Brakes to Electric-Over-Hydraulic Brakes
    If the brakes assemblies and hubs/drums on the subject trailers are actually 16-inches in diameter we have no compatible brakes. The largest electric and hydraulic drum brakes we have are 12-1/4 x 5, such as the left/right electric brake set # AKEBRK-12 which is rated for a 12K axle and the left/right hydraulic set # 23-408-409 also rated for 12K axles. We do have electric-over-hydraulic (EOH) actuators like the HydraStar Drum Brake Actuator # HBA-10 and the others shown on the linked...
    view full answer...
    Image 1 for
  • Can I Use Dexter 7,000 lb Brakes On A Lippert 7,000 lb Axle
    Hello Phillip. The brake assemblies rated between 5,200 lbs and 7,000 lbs are all the same size. They use the same 5 bolt pattern for the mounting flange and the brake shoes are 12" x 2". So, yes, you can use Dexter 7,000 lb brake assemblies on your 6,600 lb Lippert axle. I recommend the Dexter Electric Trailer Brakes # 23-180-181.
    view full answer...
  • Converting Electric-Over-Hydraulic Brakes to Electric Brakes on Trailer
    If your trailer is currently equipped with electric-over-hydraulic drum brakes then a good portion of the conversion process to change it to an electric only brake setup will simply be removing existing components that are no longer needed. You will need to replace the hydraulic brake assemblies with electric units such as the etrailer.com # AKEBRK-12 if your Dexter 12K axle currently has 12-1/4 inch x 5 inch drums and re-wire the trailer accordingly. I have attached a great article on...
    view full answer...
  • Are the Brake Shoes from the Dexter Hydraulic Brakes # 23-408-409 Sold Individually?
    I have an answer about the brake shoes on the Dexter Hydraulic Drum Brake Kit - Duo Servo - 12-1/4" - Left and Right Hand Assemblies # 23-408-409. With this hydraulic kit, we do not carry just the brake shoes individually. With that being said, you need to purchase the complete assemblies.
    view full answer...
  • Parts Needed to Convert Trailer from Electric Drum to Electric-Over-Hydraulic Drum Brakes
    To convert your gooseneck trailer from electric drum brakes to EOH (electric over hydraulic) brakes you'll need a few items, all of which are detailed in the linked article on adding an EOH braking system to a trailer. These include the hydraulic brake assemblies, the hub/drums you have, an EOH actuator like the HydraStar # HBA-12, a brake line kit, emergency breakaway kit and a compatible trailer brake controller that will work with an EOH actuator. Not all trailer brake controllers work...
    view full answer...
  • Converting From Dexter 12K Disc Brakes to Dexter 12K Drum Brakes
    The correct Dexter Hydraulic Drum Brake Kit for your Dexter 12K Axle is part # 23-408-409. The Dexter Hydraulic Drum Brake Kit part # 23-406-407 that you referenced is for Dexter 15K Axles and will not work for you. The Dexter Hydraulic Drum Brake Kit uses the same brake mounting flange as your disc brake setup so it will be a direct swap. However, you will still need to obtain the hub and drum. Unfortunately, we do not carry these but the correct part number for the hub is part 8-214-8UC1...
    view full answer...
  • Replacement Brake Assemblies for 12k Trailer Dexter Axle
    Hey Almir, since your trailer has a Dexter 12k axle on it currently the replacement brake assemblies part # 23-408-409 are correct replacements and will work great. We don't sell 12k axles at this time though so we wouldn't be able to help with that. You'd have to find a trailer shop in your area that can order custom axles.
    view full answer...


Info for this part was:

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

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