bing tracking image
  1. Trailer Brakes
  2. Dexter
  3. Hydraulic Drum Brakes
  4. 9000 lbs Axle
  5. 10000 lbs Axle
  6. 12000 lbs Axle
Hayes/AL-KO Hydraulic Brake Kit - Duo Servo - 12-1/4" - Left Hand/Right Hand - 9K to 12K

Hayes/AL-KO Hydraulic Brake Kit - Duo Servo - 12-1/4" - Left Hand/Right Hand - 9K to 12K

Our Price: $711.36
Trailer Brakes
This item qualifies for Free Shipping
Shipping Weight: 42 lbs
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Need help with installation?
Locate installers near me
12-1/4" x 3-1/2" Hydraulic trailer brake assemblies feature a dual-plunger design. Mounting flanges have 5-bolt pattern. Fit 16" or larger wheels. Great Prices for the best trailer brakes from Dexter. Hayes/AL-KO Hydraulic Brake Kit - Duo Servo - 12-1/4" - Left Hand/Right Hand - 9K to 12K part number K23-524-00-2 can be ordered online at or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (4)
  • Q & A (0)
  • Photos
  • Why etrailer?

Dexter Trailer Brakes

  • Hydraulic Drum Brakes
  • 9000 lbs Axle
  • 10000 lbs Axle
  • 12000 lbs Axle
  • 12-1/4 x 3-1/2 Inch Drum
  • 16 Inch Wheel
  • 16-1/2 Inch Wheel
  • 17 Inch Wheel
  • 17-1/2 Inch Wheel
  • Boat Trailer
  • Camper
  • Car Hauler
  • Snow Trailer
  • Utility Trailer
  • Dual Servo
  • Dexter

12-1/4" x 3-1/2" Hydraulic trailer brake assemblies feature a dual-plunger design. Mounting flanges have 5-bolt pattern. Fit 16" or larger wheels.


  • Hydraulic drum brake assemblies are designed for use with surge-type trailer brake actuators
  • Dual-plunger design delivers same amount of braking when driving either forward or in reverse
  • Mounting bolts and hardware included
  • Made in the USA


  • Application: most standard hub-and-drum assemblies including Dexter, Lippert (LCI), and AL-KO/Hayes
  • Configuration: left hand (driver's side) and right hand (passenger's side)
  • Dimensions: 12-1/4" diameter x 3-1/2" wide
  • Mounting flange bolt pattern: 5 bolt
  • Wheel size: 16" or larger
  • Axle rating: 9,000 lbs to 12,000 lbs

K23-524-00 Hayes / ALKO 12-1/4" x 3-1/2" Hydraulic Brake Assemblies - Left Hand and Right Hand - 9K to 12K

Item # K23-524-00-2

Customer Satisfaction Score:

Customer Reviews

Hayes/AL-KO Hydraulic Brake Kit - Duo Servo - 12-1/4" - Left Hand/Right Hand - 9K to 12K - K23-524-00-2

Average Customer Rating:  5.0 out of 5 stars   (4 Customer Reviews)

12-1/4" x 3-1/2" Hydraulic trailer brake assemblies feature a dual-plunger design. Mounting flanges have 5-bolt pattern. Fit 16" or larger wheels.


etrailer as always has what I need, ships fast, and product is "as advertised"!
A pleasure to talk to the tech's when I have questions and even go as far as calling manufacturer to verify equipment selections.
Keep up the GREAT work.





See what our Experts say about this Dexter Trailer Brakes

  • Correct Braking Assemblies for Haynes Axle with 6 Bolts
    The larger Haynes Axles did in fact have a 6 bolt brake mounting flange but the braking assemblies actually only uses five bolts to attach. Therefore, the Hayes/AL-KO Hydraulic Brake Assembly part # K23-524-00 is very what you need. That said, you would need to order a quantity of two in order to cover both sides of the axle as the above part is one for one assembly. If you want to buy both you can simply order two of the above or go with the Hayes/AL-KO Hydraulic Brake Kit part # K23-524-00-2. I...
    view full answer...
    Image 1 for
  • Can 12 Inch Hub Drums for Electric Brakes Be Used With Hydraulic Brake Assemblies
    If they're still in serviceable condition, you can indeed continue to use your existing hub/drums. Assuming you have a 5 bolt brake flange, and the inside diameter and depth of your existing brake drums is 12-1/4 inches and 3-1/2 inches respectively, the Dexter # K23-524-00-2 would work perfectly.
    view full answer...
  • Can the Hubs Be Reused When Switching from Electric to Hydraulic Brakes On An AL-KO 10K Axle
    Generally speaking, you can reuse the hubs when switching from electric to hydraulic brakes or vice versa. There is no difference in the hub but you do need to be sure the braking assemblies are the same size. The Hayes/AL-KO Hydraulic Brake Kit part # K23-524-00-2 is my recommendation for hydraulic drum brakes and should work with your existing hubs no problem just be sure to verify the size of the drum and make sure it's 12-1/4" x 3-1/2". If you can provide more info on the trailer...
    view full answer...
  • Can Hayes/AL-KO Hydraulic Brake Kit be Used with Surge Brakes
    Yes the Hayes/AL-KO Hydraulic Brake Kit # K23-524-00-2 that you referenced will work with surge brake actuators. The diameter of the wheel cylinder is 1-3/4 inches.
    view full answer...
  • Trailer Brake Replacement For Hayes 6 Bolt 10k Axle
    Based on your picture and my research it appears that you may have a 6 bolt pattern mounting flange but will only use 5 bolts to attach. With that being said, a 12 1/4" diameter, 3 1/2" wide hydraulic brake assembly replacement would be the Hayes/AL-KO Hydraulic Brake Kit - Duo Servo # K23-524-00-2. This will fit a 16" wheels or larger, up to 17 1/2".
    view full answer...
    Image 1 for Image 2 for
  • Solution for Needing Replacement Brakes/Trailer Hubs for Trailer with Mobile Home Axles
    Mobile home axle parts are considered one time use and are not able to be replaced with standard trailer parts so you'd be looking at having to replace the axles. I'd need the distance between the spring centers of your current axle as well as the distance from hub face to hub face and I'd be able to pick out the correct axle for your application. You'll also need the bolt pattern of the wheels you have to pick out which I attached a help article on determining. I also attached a link...
    view full answer...
  • How To Determine Correct Brake Assemblies For A Tandem 10K Axle Gooseneck Trailer
    Yes you can absolutely send a couple pictures in, however more importantly you're going to need to know the inside diameter of your hub, and take note of the mounting flange pattern. Since you already know your axles capacity, that takes one variable away, but you'll need to find the other two values as well in order to get the correct assemblies. For instance, the Hayes/AL-KO Hydraulic Brake Kit # K23-524-00-2 are for 9,000 to 12,000lbs axles, measure 12-1/4" x 3-1/2" wide, this would...
    view full answer...
    Image 1 for
  • Recommended Electric Trailer Brakes With Haynes/AL-KO 5 Bolt Brake Mounting Flange Pattern
    You are correct that there are two different 5 bolt brake mounting flange bolt patterns, but I recommend re measuring your drums as they should be either 12" or 12'1/4". You will want to measure your current drums according to the included diagram. The Hayes/AL-KO Hydraulic Brake Kit - Duo Servo - 12-1/4" - Left Hand/Right Hand - 9K to 12K # K23-524-00-2 use the larger 5 bolt pattern as shown in the included diagram, but are designed for 9000-12000lb axles and use a 12-1/4" drum. If this...
    view full answer...
    Image 1 for Image 2 for Image 3 for
  • Will Hayes/AL-KO Hydraulic Brake Kit # K23-524-00-2 Work with EOH Actuator
    Yes, the Hayes/AL-KO Hydraulic Brake Kit # K23-524-00-2 will work with electric over hydraulic actuators like the HydraStar # HBA-12.
    view full answer...
  • Replacement Electric Brakes For A 10,000 Pound Trailer Axle
    There are three different sizes of electric brakes that could work for your 10,000 pound axle. I would need to know the current size of brakes that you currently have on your trailer. The three sizes are listed below: 12-1/4 X 3-3/8 Inch Drum 12-1/4 X 4 Inch Drum 12-1/4 X 3-1/2 Inch Drum The Electric Trailer Brake Kit w/ Dust Shields # AKEBRK-10 have a dimension of 12-1/4 inch diameter X 3-3/8 inch wide. If you could find out your current measurements and get back with me I will...
    view full answer...
  • Will The Hayes/AL-KO Brakes # K23-524-00-2 Work With A Hydrastar Electric/Hydraulic Actuator
    Yes, When installing The Hayes/AL-KO Hydraulic Brake Kit # K23-524-00-2 you can use a hydrastar electric over hydraulic actuator to help operate the brakes. I would recommend The Hydrastar Electric Over Hydraulic Actuator for Drum Brakes # HBA-12. I recommend this kit over the other kits because it has a faster response time and the trailer brakes are triggered when you apply the brakes in the tow vehicle. I attached a review video link below.
    view full answer...
  • Replacement Braking Assemblies for a 10,000 Lb Trailer Axle
    The correct replacement braking assembly for your trailer should be either the Hayes/AL-KO Hydraulic Brake Kit part # K23-524-00-2 or the Dexter Hydraulic Drum Brake Kit part # 23-410-411. If you take a look for a tag on the center of the axle that should tell you the manufacturer and weight capacity. If not you would need to inspect the brake mounting flange and size of the assembly. The Dexter assembly uses a 7 bolt brake mounting flange and is 12-1/4" diameter x 3-3/8" wide (see photo...
    view full answer...
    Image 1 for
  • Replacement Drum Brakes Assembly for 10,000 lb Dexter Axle
    We have drum brake assemblies for your 10K Dexter axles. If you want the electric assemblies, we have the Dexter Electric Brake Kit - Self-Adjusting - 12-1/4" - Left/Right Hand Assemblies - 9K to 10K # 23-450-451 if your hubs are 12-1/4 by 3-3/8 inches. If your hubs are the 4 inch width, then you will use the Dexter Electric Trailer Brake Kit # 23-438-439. If you have hydraulic brakes we have the following: # 23-410-411 for 12-1/4 x 3-3/8 inch drum # K23-524-00-2 for 12-1/4 x 3-1/2...
    view full answer...

Do you have a question about this Trailer Brake?

  • Why

    At we guarantee:
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate trailer brake information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
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

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.