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  1. Trailer Brakes
  2. Kodiak
  3. Disc Brakes
  4. 12000 lbs Axle
  5. Rotor
  6. 16 Inch Wheel
  7. 16-1/2 Inch Wheel
  8. 17 Inch Wheel
  9. 17-1/2 Inch Wheel
Kodiak Disc Brake Kit - 11" Rotor - 8 on 6.5 - E-Coat - Leaf Spring - 12K - Dexter/Lippert

Kodiak Disc Brake Kit - 11" Rotor - 8 on 6.5 - E-Coat - Leaf Spring - 12K - Dexter/Lippert

Item # K2R1258L12
Our Price: $1,018.93
Trailer Brakes
This item qualifies for Free Shipping
Shipping Weight: 123 lbs
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Machine-finished rotors and e-coated calipers and mounting brackets are included in this 2-wheel-assembly disc brake kit. Designed for 12,000-lb standard duty Dexter and Lippert axles with leaf springs. Fits 16" dual wheels. Great Prices for the best trailer brakes from Kodiak. Kodiak Disc Brake Kit - 11" Rotor - 8 on 6.5 - E-Coat - Leaf Spring - 12K - Dexter/Lippert part number K2R1258L12 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (16)
  • Q & A (0)
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Kodiak Trailer Brakes - K2R1258L12

  • Disc Brakes
  • 12000 lbs Axle
  • Rotor
  • 16 Inch Wheel
  • 16-1/2 Inch Wheel
  • 17 Inch Wheel
  • 17-1/2 Inch Wheel
  • Camper
  • Car Hauler
  • Utility Trailer
  • 8 on 6-1/2
  • Kodiak

Machine-finished rotors and e-coated calipers and mounting brackets are included in this 2-wheel-assembly disc brake kit. Designed for 12,000-lb standard duty Dexter and Lippert axles with leaf springs. Fits 16" dual wheels.


  • Brake assemblies make it easy to change from an idler axle to a disc brake axle
  • Disc brakes deliver better performance than drum brakes
    • More consistent stopping, even at highway speeds
    • Dramatically shorter stopping distance
  • Maintenance costs are lower than for drum brakes
    • Fewer moving parts to maintain, repair and replace
  • Slip-on, cast iron, over-the-hub rotors
    • Fit over idler hubs and are held in place by included bolts
      • Rotor spacers ensure proper positioning
    • Prevent heat-related damage with vented design that effectively dissipates heat
  • E-coat finish on calipers and brackets provides corrosion resistance for freshwater and limited saltwater use
  • Cast iron calipers are self-adjusting for smooth, equal braking
    • Cast iron construction does not flex like aluminum
    • Low-drag design retracts piston farther than other calipers for a cooler-running brake
    • Stainless steel piston is 2-1/2" in diameter - 30 percent larger than other brands
      • More braking torque than the competition
    • High-performance, ceramic brake pads
  • Ductile iron mounting brackets provide strength and durability
    • Side-support design ensures that load is placed on bracket, not bolts
    • Extra embossing for additional thread contact ensures tight, secure mounting for caliper guide bolts
    • 7-Bolt brake flange mounting configuration - weld-on flange available (sold separately)
  • Kit includes 2 full brake assemblies
    • 2 Cast iron rotors
    • 2 Rotor spacers
    • 2 E-coated, cast iron calipers
    • 2 E-coated, ductile iron caliper-mounting brackets
    • 4 Stainless steel caliper-mounting bolts
  • Hydraulic brake actuator and lines (sold separately) are required for brakes to be activated
    • Requires psi rating of at least 1,500


  • Fits:
    • Axle capacity: 12,000 lbs
    • Axle type: Standard-duty Dexter and Lippert
    • Wheel size: 16" dual wheels
  • Bolt pattern: 8 on 6-1/2"
  • Wheel bolt diameter: 5/8"
  • Rotor diameter: 11"
  • Brake flange configuration: 7 bolt
  • 3-Year warranty


  • Not for use on 12K HD axles
  • These kits will not fit Dexter axles that came from the factory with Dexter disc brakes. They will only fit axles that come with drums or idler hubs.

  • Disc Brakes

    More and more people are switching their trailers over to disc brakes, and with good reason. Disc brakes deliver consistent braking - even at highway speeds - unlike drum brakes, which often show a substantial drop in braking torque at higher speeds. In addition, disc brakes offer a substantially shorter stopping distance than drum brakes.

    Disc brake calipers have only one moving part, rather than the many found in drum brakes. This means that there are fewer parts to maintain, fewer parts to get damaged and fewer parts to have to repair or replace, thus reducing maintenance costs.

    Over-the-Hub Rotor

    Kodiak's slip-on, cast iron rotor makes it easy to convert an idler axle to a disc brake axle. Simply place the rotor over your hub. It is most often wheel bolt piloted for a loose fit and then held in place by the wheel itself. With a separate rotor and hub, you can easily repair or replace one element of your brake system without having to junk the whole thing.


    Kodiak calipers are constructed of cast iron to prevent flexing. Less flex means more braking torque, resulting in smooth, even braking every time. The corrosion-resistant stainless steel piston is 30 percent larger than standard pistons, ensuring shorter stopping distance and increased torque. In addition, the unique low-drag design of Kodiak's calipers allows the piston to retract farther than in most standard models, giving you a cooler-running brake.

    Mounting Brackets

    Designed for axles with 7-bolt brake flange configurations, the included mounting brackets are made of heavy-duty ductile iron that is embossed to provide additional threading for guide bolts. The added thread strength ensures a tighter, more secure connection between the caliper and bracket. Another unique feature of Kodiak's brackets is the side-support angle, which guarantees that the load is carried by the bracket, rather than the bolts.

2/R-11-12D-HD-REER Kodiak Disc Brakes - 2 Wheel Set - Rotor Only - E-Coat - 12,000 lbs - Dexter / Lippert Axles

Replaces 2RCMS-11-12L-KIT, 2/RCMS-11-12L and 2/RCMS-11-12D-HD-KIT

Installation Details K2R1258L12 Installation instructions

Customer Satisfaction Score:

Customer Reviews

Kodiak Disc Brake Kit - 11" Rotor - 8 on 6.5 - E-Coat - Leaf Spring - 12K - Dexter/Lippert - K2R1258L12

Average Customer Rating:  4.3 out of 5 stars   (16 Customer Reviews)

Machine-finished rotors and e-coated calipers and mounting brackets are included in this 2-wheel-assembly disc brake kit. Designed for 12,000-lb standard duty Dexter and Lippert axles with leaf springs. Fits 16" dual wheels.


Excellent product, easy install, all parts fit as they should. I put appx 150000 miles on the system.
It performs outstanding. Major improvement over
electric drum brakes.


I called first to see if a brake kit would fit my trailer. They told me yes. I ordered the brake kit. When I received the kit it was missing pieces so I called Angela W. She was very rude, arrogant, and clearly doesn't know what she's talking about. NO HELP. Turns out the brake kit was not compatible with my trailer like they said it was. I called and told them I needed to send back the kit that came in three boxes and they sent me a label for 1 box. While at the ups store I waited for over 45 minutes on hold and ended up having to pay to ship one of the boxes. $200! I called them early the next day and they told me they would not be reimbursing me for the shipping. Horrible customer service and horrible service. I wouldn't recommend them to anyone.


Unfortunately the kit i purchased did not fit the axles i specified in the order. The mechanic was not able to let me know until August. The boxes deteriorated while at the shop and I am not sure it is possible to ship them back in their current condition.

It is very unfortunate that this has happened. I have sent this information over to our customer service department for them to assist you.
-- Etrailer Expert Katrina B - 04/11/2022


What I needed, when I needed it.



Just down right AWESOME!!!!











See what our Experts say about this Kodiak Trailer Brakes

  • Kodiak Disc Brake Kit for 12,000 lb Axles
    The Kodiak Disc Brake Kit # K2R1258L12 you referenced is a fit for 12,000-lb Dexter and Lippert axles with leaf springs. Keep in mind your current idler hubs need to have an 8 on 6-1/2" bolt pattern and a 7-bolt brake flange. If you are not sure what bolt pattern you have I've added a link on this page to a help article that explains how to determine your bolt pattern. I have also added a link to a help article on adding disc brakes which you may find useful.
    view full answer...
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  • Will Kodiak Disc Brake Kit # K2R1258L12 Fit 12 Dexter Axle
    As long as your Dexter 12k axles have idler hubs installed on them Kodiak Disc Brake Kit # K2R1258L12 is a confirmed fit that would work well. An idler hub is a hub that does not have a brake drum or rotor built into it.
    view full answer...
  • What Size Flange Bolts are Needed for 12k Kodiak Disc Brakes
    Those are the flange mounting bolts you're asking about and they are not included with kits like part # K2R1258L12 so they'll need to be sourced separately. I talked to Kodiak and the bolts you need are 1/2-20 UNF x 1-3/4 inch hex bolts.
    view full answer...
  • Identifying Dexter Axle Over 10,000 lbs
    If your axle was produced after April 2001 there should be a lot number on the axle. Go to the rear side of the axle beam about 18 inches from the curb side of the vehicle (passenger side). If you see "DEXTER AXLE" the lot number should be directly below that. If it is somewhat rusty, grab some sand paper to clear things up, wipe it down and then you can use chalk or smear paint on it to help reveal the numbers. Once you find the numbers we can identify exactly what axle you have. If you...
    view full answer...
  • Determining if Kodiak Disc Brake Kit # K2R1258L12 Fits 12k Axle
    On the label for your axle there will be the capacity listed. If you see just 12k or 12,000 lb axle then the # K2R1258L12 would work. If you see 12k HD or heavy duty then it would not.
    view full answer...
  • Replacement 12K Dexter Axle Brake Kit
    For your Dexter 12K axle, you can use the Kodiak Disc Brake Kit # K2R1258L12. This kit includes the assemblies for the left and right hand side, has a 7 bolt mounting pattern, and will fit 16" or larger wheels. As long as you have idler hubs installed on your axle, this kit will work great.
    view full answer...
  • What Components Are Needed To Convert Electric to Hydraulic Disc Brakes On 12K Trailer
    I have attached a link to a helpful article that explains everything that is needed when adding hydraulic disc brakes to your trailer. In addition to a kit like part # K2R1258L12 you will need to make sure you have the right brake mount flange, and you will need to add hydraulic brake lines to your trailer. You will also need a surge brake actuator like part # T4750820 installed on your trailer frame. I have attached links to the brake lines we offer, and to the actuators we offer.
    view full answer...
  • Correct Replacement Brake Pads For Kodiak K2R1258L12
    With the Kodiak Disc Brake Kit # K2R1258L12 having a 12,000 capacity, you will need to use the Kodiak Ceramic Brake Pads # K2250CP. These are rated for Kodiak systems between 8,000 pounds and 14,000 pounds. One order of these will cover both calipers on an axle. If multiple axles need new pads, you will need to get multiple sets.
    view full answer...
  • Replacement Caliper Recommendation for Kodiak Disc Brake Kit part # K2R1258L12
    The replacement calipers of the Kodiak kit part # K2R1258L12 that you referenced is # KDBC2250E. The kit you have does have a 3 year warranty on it that protects it from manufacturer defects. Do you know why yours started to leak?
    view full answer...
  • Replacement 11" Rotor for Kodiak Disc Brake Kit
    According to Kodiak, the correct replacement rotor for the Kodiak Disc Brake Kit - 11" Rotor - 8 on 6.5 - E-Coat - Leaf Spring - 12K - Dexter/Lippert # K2R1258L12 is the # KR1110Q. The outer diameter for this rotor is 11.35".
    view full answer...
  • What Do I Need To Convert A 2012 Big Tex Trailer Model From Drum Brakes To Disc Brakes
    If you have 8 on 6.5 wheels, you will need the Kodiak Disc Brake Kit - 11" Rotor - 8 on 6.5 - E-Coat - Leaf Spring - 12K - Dexter/Lippert, part # K2R1258L12. This conversion kit was designed specifically for converting a trailer's brakes from Dexter/Lippert drum brakes to disc brakes. You will also need the HydraStar Electric-Hydraulic Actuator w/ Line Kit for Disc Brakes - 1,600 psi, part # CAR-HBA16-2. This disc brake actuator has a maximum output pressure 1,600 psi. You will need an...
    view full answer...
  • Replacement Disc Brake Kit for a Dexter 12K Axle
    The correct Kodiak Disc Brake Kit for a Dexter 12K Axle is part # K2R1258L12, not part # K2R1058D11E. I spoke with Dexter and they stated the latter would only work if you have a Dexter Hub 008-430-03. It looks like the brake mounting flange bolt pattern, rotor diameter, and calipers are the same between the above two kits but I again would not be able to confirm direct compatibility unless using the Dexter Hub 008-430-03.
    view full answer...
  • Differences Between Kodiak K2R1258L12 and K2R1058D11E Disc Brake Kits
    There difference between the Kodiak # K2R1258L12 and # K2R1058D11E disc brake kits is the application and the capacity. Both kits provide E-coated calipers and caliper mounting brackets. The # K2R1058D11E is meant for a 10K dexter axle, the # K2R1258L12 is compatible with a 12K Dexter or Lippert standard (not HD) Axle.
    view full answer...
  • Recommended Conversion from Electric Drum Brakes to Electric Over Hydraulic Disc Brakes
    The Kodiak Disc Brake Kit - 11" Rotor - 8 on 6.5 - Raw Finish - Leaf Spring - 12K - Dexter/Lippert # K2R1258L12 is the option for dual wheel axles and will use idler hubs compatible with your axles for mounting the wheels. Then I recommend the HydraStar Electric Over Hydraulic Actuator Kit for Disc Brakes - 1,600 psi # HBA16-252-82. If you need help in getting the correct idler hubs for this conversion, you can pull one of your current brake drum hubs and get the bearing numbers off...
    view full answer...
  • Is Dexter DX Series Actuator Compatible With Kodiak Hydraulic Disc Brake Kit
    The Dexter DX Series brake actuator # K71-650 is for drum brakes with 1,000psi while the Dexter DX Series Electric Over Hydraulic Brake Actuator for Disc Brakes # K71-651 has 1,600 psi so that is the actuator you'll need to go with the Kodiak hydraulic disc brake kit # K2R1258L12. Disc brakes will require a higher psi than drum brakes. Included are additional video resources for more information.
    view full answer...
  • Parts Needed to Add Disc Brakes to Trailer with Dexter 12K Axles w/ Electric Drum Brakes
    The Kodiak # K2R1258L12 Disc Brake Kit is compatible with a 12K Dexter axle with a 7-bolt brake mounting flange. Your current wheels/hubs should have an 8 on 6-1/2 inch bolt pattern. You'll also need an electric over hydraulic brake actuator, a brake line kit, a break away system and a brake controller that's compatible with electric over hydraulic brake systems. For the electric over hydraulic actuator, I'd recommend going with the Hydrastar # HBA16. Our install techs have found it to...
    view full answer...
  • How to Remove the Rotor on 12k Dexter Disc Brake Kit
    When removing the rotor on your 12k Dexter disc brakes, all you need to do is pull it off of the hub assuming you have already removed the caliper. The only thing that secures it to the studs is the wheel and lug nuts when you put the wheel on. It is possible that yours is giving you some difficulty if dirt or rust has built up in some way, but you should still be able to take it off. Just be careful to not damage anything else when trying to break it loose. I have attached a video from...
    view full answer...
  • Disc Brake Kit and Hubs For 12,000LB Dexter General Duty Trailer Axles
    The Kodiak Disc Brake Kit # K2R1258L12 specifically is made for 12,000lb standard duty Dexter and Lippert axles. Each kit provides the rotor and caliper for one axle. This brake kit will mount to your Dexter Trailer Idler Hub Assembly # 8-214-8UC1. If you can provide me with additional information about your trailer and the brakes you have I can help you identify any other parts such as disc brake actuator or brake lines that you may also need.
    view full answer...
  • Disc Brake Kit that Can be Used on Rockwell 12k Trailer Axle
    Since Dexter owns Rockwell now the correct parts you'd need to install disc brakes on a 12k Rockwell axle is the idler hub part # 8-214-8UC1 and the disc brake kit # K2R1258L12. The disc brake kit is sold per axle whereas the hubs are sold individually.
    view full answer...
  • Will Kodiak Disc Brake Kit K2R1258L12 Fit a 12K Rockwell Axle on PJ Trailer
    I am assuming that one of the axles has brakes and the other does not. If that is the case and the axle that does not have brakes has idler hubs then you can use Kodiak kit # K2R1258L12 provided that the hub has an 8 on 6-1/2 bolt pattern and brake mounting flanges on the axle. You will also need some addition brake line and related parts such as what is included in kit # 15SI-BLKIT. Or it may be more beneficial to go ahead and replace all the lines with a tandem axle kit # HS496-252.
    view full answer...
  • Kodiak Disc Brake Kit Recommendation for Trailer with Dexter Torflex 3,500 lb Axles
    Depends on the size of your wheels what Kodiak disc brake kit you'll need is. If you have a 14 inch or larger diameter wheel I would recommend the Dacromet and Stainless kit part # K2HR35DS or if you have smaller wheels than that you'd want the part # K2HR35D-8. These are totally compatible with Dexter Torflex axles also.
    view full answer...
  • How To Convert Trailer with 12K Axles from Drum to Electric Over Hydraulic Disc Brakes
    Yes, we do offer disc brakes for trailers with 12,000 lbs axles. I recommend the Kodiak Disc Brake Kit, part # K2HR12A11-120DW for AL-KO or part # K2R1258L12 for Dexter/Lippert (Most Common) axles. If you don't know what axles you have you'll need to crawl under the trailer and find the tag on the beam which will list the axle manufacturer. In order to complete your setup you'll just need the Hydrastar Marine Electric Over Hydraulic Actuator Kit part # CAR-HBA16-2. This works for single...
    view full answer...
  • Replacement Hub And Drums For Dexter 12K Axle
    We have the perfect idler hub set up for you! The Dexter Trailer Idler Hub Assembly for 12,000-lb Axles # 8-214-8UC1 has an inner bearing # 3984 and an outer bearing # 28682. The idler hub has a bolt pattern of 8 on 6-1/2 inches. The hub has an oil bath system that allows for easy maintenance. The Drum and Mounting Bolts # 7-103 are sold separately. The Kodiak Disc Brake Kit # K2HR12A11-120DW will not work with your 12K Dexter axle because this kit is only for a 12,000 ALKO axle. The...
    view full answer...
  • Disc Brake Assemblies For Changing A 12,000LB Dexter Axle To Hydraulic Disc Brakes
    We have the Kodiak Disc Brake Kit # K2R1258L12 that is designed to fit your 12,000lb Dexter axle. You will need to ensure that you have the Standard Duty 12,000lb axle as this kit will not fit if its a Heavy Duty 12,000lb axle. If you need help determining which you have please let me know your axle serial number that is on the information sticker for the axle or can also be found stamped in the axle tube on the rear of the axle on the passenger side. The Kodiak Disc Brake Kit # K2HR12A11-120DW...
    view full answer...

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