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  1. Trailer Brakes
  2. Dexter
  3. Hydraulic Drum Brakes
  4. 8000 lbs Axle
  5. 12-1/4 x 3-3/8 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 - 8K
Dexter

Dexter Hydraulic Trailer Brakes - Duo Servo - 12-1/4" - Left/Right - 8K

Part Number: 23-402-403
In Stock
$850.46
Trailer Brakes
Dexter 8000 lbs Axle Trailer Brakes - 23-402-403
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Brakes that 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 3-3/8" 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 - 8K part number 23-402-403 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Dexter Trailer Brakes - 23-402-403

  • Hydraulic Drum Brakes
  • 8000 lbs Axle
  • 12-1/4 x 3-3/8 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

Brakes that 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 3-3/8" 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 3-3/8" wide
  • Mounting flange bolt pattern: 4 bolt
  • Wheel size: 16" or larger
  • Axle rating: 8,000 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.



23-402 Dexter 12-1/4" Duo-Servo Hydraulic Brake Assembly - LH - Self Adjust - 8K

23-403 Dexter 12-1/4" Duo-Servo Hydraulic Brake Assembly - RH - Self Adjust - 8K




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Customer Satisfaction Score:

Ratings & Reviews

4.8

88 reviews
Brakes that 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 3-3/8" Assemblies fit 16" or larger wheels. Made in the USA.

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See what our Experts say about this Dexter Trailer Brakes

  • Looking For Drum Brakes That Fit An 8,000 Pound Axle
    To get the correct replacement brake drums for your 8,000 pound axles, you will need a few things to be verified. The first will be if they are are hydraulic or electric brakes. If they are hydraulic, we currently have the Dexter Hydraulic Drum Brake Kit - Duo Servo - 12-1/4" - Left and Right Hand Assemblies - 8K # 23-402-403 that will measure 12-1/4 x 3-3/8 inches. This will also use a 4 bolt pattern to attach to your axle. If you have electric brakes though, you will need a few more...
    view full answer...
  • Bolt Pattern of Mounting Flange of Dexter 9,000 lb Hydraulic Brake Assemblies
    The bolt pattern of the Dexter Hydraulic Drum Brake Assembly # 23-402-403 that you referenced is is 4.92 inch by 4.92 inch and the diameter of the bolt holes are .545 of an inch.
    view full answer...
  • What Brake Assemblies Fit on the Dexter D80 Trailer Axle?
    The Dexter Electric Trailer Brake Kit # 23-434-435 are the assemblies most often found on Dexter D80 axles which utilize electric brakes. If your axle is set up with hydraulic drum brakes they most likely have the Dexter Hydraulic Drum Brake Kit # 23-402-403. If you can locate the axle serial number I can reach out to Dexter to find out exactly what parts were installed from Dexter to verify the correct replacements and what upgrades are available. The serial number will be on the axle...
    view full answer...
  • Replacement Dual Servo Hydraulic Drum Brakes For Dexter 8,000LB Axle With & Without Parking Brakes
    It sounds like you have the Dexter Hydraulic Drum Brake Kit # 23-402-403 on your Dexter P15 8,000lb axle. The Arm on the Dexter Hydraulic Drum Brake Left # K23-171-00 and Right # K23-172-00 is for a parking brake feature. While you will be able to fit both to the same axle I do not recommend using them if they are not attached to any parking brake line. Over time the parts could lead a premature failure since they will not be regularly used. We do have the Kit # 23-402-403 available separately...
    view full answer...
  • What is the Right Drum Brake Assembly that Goes with the Left Assembly # K23-171-00?
    The correct corresponding right hand assembly for the Dexter Hydraulic Drum Brake Kit # K23-171-00 is the # K23-172-00. We also sell both of these parts together with the # 23-402-403.
    view full answer...
  • Can 7K 12 Inch Electric Brakes be Used for 8K Trailer Axles
    The Dexter Electric Trailer Brake Kit # 23-180-181 will work for your 8K axles if indeed your current brakes are electric, have a 12" diameter, and measure 2" wide. Standard 8K brakes like part # 23-402-403 though are hydraulic, have a 12-1/4" diameter, and measure 3-3/8" wide. As long as your specs match the 7K electric brakes you're good to go.
    view full answer...
  • Is Dexter 8-285-11UC3 Brake Drum Compatible with Hydraulic Trailer Brakes
    The Dexter # 8-285-11UC3 brake drums are indeed compatible with either electric or hydraulic brake assembles. Your existing drums would work perfectly with the # 23-402-403 Dexter Hydraulic Drum Brake Kit. I would recommend that you inspect the inside diameter of the drums to make sure they are smooth and in good shape.
    view full answer...
  • Availability of Electric Over Hydraulic Drum Brake Kit for 8,000 lb Dexter Axle
    Hi Josh; we don't have a kit but I can get you the parts you need. I'm assuming you have electric brakes right now so you're going to need the EOH actuator along with the brakes and hydraulic lines. I recommend the following: -Dexter Hydraulic Drum Brake Kit - Duo Servo - 12-1/4" - Left and Right Hand Assemblies - 8K # 23-402-403 -Hydrastar Electric Over Hydraulic Actuator for Drum Brakes - 1,200 psi # HBA-12 (the 1,200 psi model is required for 8k axles) -Hydrastar Hydraulic Brake Line...
    view full answer...

Do you have a question about this Trailer Brake?


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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