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  1. Trailer Brakes
  2. Kodiak
  3. Disc Brakes
  4. 8000 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 - 13" Rotor - 8 on 6-1/2 - Stainless - 5/8" Bolts - 8K Dexter Axle
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Kodiak

Kodiak Disc Brake Kit - 13" Rotor - 8 on 6-1/2 - Stainless - 5/8" Bolts - 8K Dexter Axle

Part Number: K2R858DS
$1,808.31
Trailer Brakes
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Stainless steel rotors, calipers and mounting brackets are included with this 2-wheel-assembly disc brake kit. Designed for 8,000-lb Dexter axles and 16" and larger wheels. Requires 5/8" wheel bolts. Great Prices for the best trailer brakes from Kodiak. Kodiak Disc Brake Kit - 13" Rotor - 8 on 6-1/2 - Stainless - 5/8" Bolts - 8K Dexter Axle part number K2R858DS can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Kodiak Trailer Brakes - K2R858DS

Highlights

  • Stops Smoother and Faster: Disc design gives consistent braking even at highway speeds for shorter stops.
  • Built to Resist Corrosion: All-stainless rotors, calipers, and brackets stay rust-free even in marine use.
  • Bolts Right On: Slip-on rotors fit over standard idler hubs and hold in place with wheel bolts for easy setup.
  • Runs Cooler Under Load: Vented 13" rotors and low-drag calipers dissipate heat to prevent fade or damage.
  • Stays Strong Over Time: Stainless mounting brackets with side-support design keep calipers tight and secure.
  • Rated for Heavy Duty Use: Fits 8,000-lb Dexter axles with 5/8" wheel bolts and 4-bolt brake flanges.

Features to know about

Upgrade to Disc Braking Power: Stainless Steel Kit for 8,000-lb Dexter Axles

If you’re ready to step up from drum brakes or replace worn units, this Kodiak kit delivers smooth and consistent stopping. The 13" stainless steel rotors slip right over standard idler hubs and are held in place by your wheels and 5/8" wheel bolts. You get better high-speed braking torque, even stops, and shorter braking distances – all with fewer moving parts to maintain or replace.

Built for Salt, Spray, and Years of Use: All-Stainless Construction

Rust and corrosion are no match for this setup. Every major component—rotors, calipers, and mounting brackets—is made from stainless steel. The kit carries a 1,000-hour salt-spray rating, so it’s ready for extended use in wet or marine environments. The calipers, piston, and brackets won’t flex or corrode over time, keeping braking power strong season after season.

DIY-Friendly Conversion: Slip-On Rotors and Bolt-On Brackets

Swapping to discs doesn’t have to be complicated. These rotors simply slip over your existing hubs, and the 4-bolt stainless mounting brackets bolt in place securely. Because the rotor and hub are separate pieces, you can replace one without having to change both. It’s a straightforward upgrade that saves time on installation and future maintenance.

Keeps Cool and Stops Strong: Vented Design with Self-Adjusting Calipers

Long downhill grades and heavy loads can heat up brakes fast. The vented rotor design sheds heat efficiently to prevent fade and protect against heat-related damage. Each caliper is self-adjusting for smooth, equal braking while a low-drag design helps them run cooler. The stainless steel piston measures 2-1/4" in diameter—about 30 percent larger than standard—for more braking torque when you need it most.

Complete Two-Wheel Kit with Long Warranty

The kit includes two stainless rotors, two calipers, two caliper-mounting brackets, and four caliper-mounting bolts. It fits 8,000-lb Dexter axles with a #42 spindle, 16" or larger wheels, an 8 on 6-1/2" bolt pattern, and a 4-bolt brake flange configuration. Hydraulic lines and actuator (rated at least 1,500 psi) are sold separately. Backed by a 6-year warranty for lasting peace of mind.

Specs

Weight and Capacity

  • Axle capacity: 8,000 lbs

Axle and Spindle Information

  • Spindle type: #42 Spindle
  • Axle type: Dexter

Wheel Compatibility

  • Wheel size: 16" and larger
  • Bolt pattern: 8 on 6-1/2"
  • Wheel bolt diameter: 5/8"

Brake Components

  • Rotor diameter: 13"
  • Brake flange configuration: 4 bolt

Warranty

  • Warranty period: 6-Year warranty

2/R-133-8D-5-SSS Kodiak Disc Brakes - 2 Wheel Set - Rotor Only - Stainless Steel - 5/8" Wheel Bolts - 8,000 lbs - Dexter Axle

Replaces 2/RCM-133-8D-10-SS-K

Installation Details K2R858DS Installation instructions



Video of Kodiak Disc Brake Kit - 13" Rotor - 8 on 6-1/2 - Stainless - 5/8" Bolts - 8K Dexter Axle
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for All You Need to Know About the Kodiak Disc Brakes

Speaker 1: Today we're going to be taking a look at the Kodiak line of Disc Brake Kits. Now, these kits are available in multiple configurations to fit multiple size axles. They're also available in several different finishes.A disc brake kit like this one from Kodiak is an excellent solution to give us good braking force. Typically, for this kit anyway, you're looking at like a 3500-pound axle. A lot of boat applications, you're hauling a boat sometimes miles and miles and miles, and without brakes on your trailer, you put a lot of unnecessary stress and strain on your truck. A braking kit like this allows us to take the stress, the strain off the braking system on our truck but also gives us a safer ride.In this application we've got a surge coupler at the front of the trailer, so as the truck slows it applies the hydraulic fluid pressure, squeezing our caliper together giving us excellent stopping abilities.

The rotors, calipers, and the ceramic pads are all automotive grade, so they're going to be made to the highest standards being sure we get excellent braking capabilities.Now when we compare a disc brake kit like this to a hydraulic drum-style brake, there are several advantages. Of course, we all know disc brakes tend to work better than drum brakes. They lock up less. We typically don't have the moisture being held inside. Especially in a marine application, that hub fills up with water, that moisture stays inside, causes some corrosion issues.

In this situation, once we bring these out of the water, everything's going to drain away. Air can get to it very readily and dry everything up.Another advantage we're going to get with this particular kit over the other disc brake kits available, the material composition is very corrosion-resistant. Our rotor, caliper, all stainless steel, plus they take that a step further, put a Dacramet finish all the way around. So that's going to work out really well, especially in a marine application like this, but also just on a utility trailer, keeping everything nice, corrosion-free. It's also going to be an excellent, excellent choice if you use it in a saltwater-type application.Something else you'll notice, pretty common on automobile applications, not usually on trailers, is going to be the ventilated rotor here.

So you've got two wear surfaces here and here. Those are going to be separated to allow air to flow freely in there and get everything cooled off to give us premium braking performance every time we hit those brakes.All right. With the bracket installed, we can move onto installing our rotor. That's one of the big benefits I like about this kit. You don't have the whole disc with the hub assembly in it.

So if you ever need to replace the disc, you're just replacing the disc, not your entire hub. This is going to fit right on our idler hub just like that, very common on automobile applications. They call this more like a top hat rotor where it it slides over your lugs, and then your wheel is actually going to hold that in and flush.Next, we'll move on to getting our caliper installed. Now the calipers can go either side. You don't have to have a left and a right. You can see we've got a bleeder screw on both sides. We want, of course, for our hydraulic connection to be facing in. Our slide bolts are going to come in this way just like that, and then these two portions are going to go on the back side of our bracket. So we slide that over, bring it in, and then we'll just push our bolts in, line them up with our holes and get them started. Now those do have loctite on them, so you'll just get them started a little bit, and then we'll use a 13mm socket and snug them on down.Now that we've got those snugged down, we'll use our torque wrench and we're going to torque them down to the specifications listed in the instructions. With our brake assemblies in place, it's time at this point to install our tire back on. Now, we do recommend using a torque wrench and torquing these down properly per the 1/2" stud application. Something we've seen, especially in the automobile industry, if you tighten these lug nuts down too much, you might cause that rotor to warp a little, decreasing your performance. That's going to complete our look at the Kodiak line of Disc Brake Kits.

Ratings & Reviews

4.7

101 reviews
5 Stars
(86)
4 Stars
(9)
3 Stars
(3)
2 Stars
(1)
1 Star
(2)
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by:
Package arrive with very damaged appearance. Incorrect/noncompatible hardware for a Dexter 8k axle. After waiting an extra delay period for additional inventory to arrive it was disappointing.
by:
HUGE improvement over the stock drum brakes on my 2013 EZ Loader boat trailer which had completely rusted out. With launching exclusively in saltwater the stainless steel disc's are far superior and much easier to rinse/wash clean. They look almost new after a full year of use. Rather easy install after removing the hub assembly and cleaning up the spindles.
Kate F. profile picture
Etrailer Expert

Kate F.

12/3/2025

Glad you make the switch to disc brakes Todd, and went for the stainless especially since you are launching into salt water. What body of water are you mainly going out in? We are located in Missouri so I am out on the Lake of the Ozarks and Mark Twain Lake when I can. I dabble in some local bass tournaments as well.

by:
Now my wheels don’t drag!! They bolted right on very easily and they don’t seize like my old disk brakes! Now they just work. No longer any question whether my trailer will move when I come back to it in the spring. Money well spent!
by:
I know they were costly because I went the extra step and also installed stainless hubs and lugnuts but going with Kodiak stainless breakes was they way to go. They look and perform amazingly.
Michael profile picture

Michael

8/31/2024

Still working great and looking good.

by:
Perfect fit and great price! Service from Etrailer was great, they even processed a price match for me a few weeks after delivery of my order. The service has been fantastic and I’m very pleased with the quality of these Kodiak Stainless Steel Brakes, Rotors and Hubs for my boat trailer after removing old leaf springs and upgrading to torsion axels. I’m also eliminating the surge brake actuator and going to electric over hydraulic for better performance and braking power and replacing all brake lines with Kodiak brake lines. I’ve included some before and after pics of the install for reference.
by:
Retrofit on my ez loader trailer using these and ez loader oil hubs. Everything fit great and looks awesome. Went from intergel rotors to these. The customer support was great, ordered in between tornado warnings, they call right back.
by:
If you want trouble free brakes in a marine environment this is the only way to go. I have them on another trailer of mine for 10 years and no issues. Quinn was great to work with doing a sanity check on my selection to make sure I was ordering the right parts. Half of the order got missing within the UPS system, not etrailer's fault but several people worked well with me to get me a replacement set of parts. Was able to get concerned and knowledgeable help on the phone quicky in the several call I made. Amazing, they all speak English!!! Everyone can be great to deal with when there are no hiccups. The real test is to see how people deal with adversity and etrailer was great.
by:
I did not realize that the brakes are actually made by Dexter axel. The fit is great. The parts are great and they could not be more pleased.
by:
These brakes are excellent! And so is the service/technical support provided by George J of etrailer and others. This was the first time I ever replaced trailer brakes and I also bled the brake system for the first time. Everything went very smooth. I live in Florida and all of use of the trailer is in salt water. The brakes have held up very well.
Gregory profile picture

Gregory

3/28/2025

These Kodiak SS brakes are working fabulous. The boat trailer they are installed on is used in salt water only and they still look like new and function like new.

Jesse M. profile picture
Etrailer Expert

Jesse M.

3/28/2025

@Gregory Awesome! Glad to hear the brakes are still holding up. It really is worth investing in stainless parts if you are boating in salt water. Feel free to come back anytime you need anything!
by:
The kit I installed was a perfect match and upgrade to the original brakes I had. I did opt to replace the bracket bolts with stainless steel as well which weren’t included in the kit but were easily sourced from the local hardware store. My application called for 3/8 by 24 pitch bolts 1 inch long with 3/8 stainless lock washers. Maybe that information would be helpful for someone else. Be sure to get the 24 pitch. My sales representative Jacob K. Was knowledgeable about the product and went the extra step to help me locate one of my packages that didn’t arrive with the rest. I will definitely be using etrailer in the future.
Victoria H. profile picture
Etrailer Expert

Victoria H.

4/11/2025

Thanks for the great feedback Ryan! Glad the kit was a perfect upgrade, and we appreciate you sharing the bolt specs, that is super helpful for others. I'll let Jacob know you gave him a shout out!

by:
Just installed, which was very easy; everything fit nicely!
My only complaint concerns the bleed nipples, the neck is too short.
Having a heck of a time getting an air tight seal with the bleeder hose.
Will update after a few dips in the ocean; will see how well they hold up.
Semper Fi
by:
Great product and replacement for my rusted out old brakes.
by:
Thanks for the quick delivery but the box barely made it.
by:
These Kodiak stainless brakes - FANTASTIC ! This older Northriver Seahawk trailer brakes work perfectly now ! Thank you guys ! ??
Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

3/10/2025

Hey Lee! I'm glad to hear everything is working so well! When do you get to launch your boat for the season?

by:
Seeing how quickly high end boat trailers rusted out from salt water when I was a kid in the 1960s, I built a trailer for myself using heavily galvanized junk yard steel and took the springs apart, slathering each leaf with a very viscous grease. This trailer lasted for over twenty years of salt water use. My current triple axle aluminum trailer has needed new hubs, calipers and rotors about every 4 years due to corrosion even with good flushing after each use, so I ordered Kodiak SS 12" rotors, SS calipers and SS caliper mounting flanges. On previous brakes the actual brake pad material had been separating from their metal backing plates after maybe 4 years due to corrosion, so I was very pleased to test the new brake pads and find the pad material is bonded to what seems to be SS backing plates!! The kit however, did not comes with SS bolts to attach the caliper mounting flanges to the wheel bearing hub mounting flanges. Finding 1.25' long by 3/8" diameter SS bolts and SS nylock nuts was a time consuming nuisance so I suggest including them with the Kodiak kits. I have 12 trailers and tow a couple of boats including a 32' twin 300 hp boat rig between the Florida Keys and Chesapeake Bay seasonally and the conversion from surge brakes to electric over hydraulic using a progressive brake controller has been a MAJOR safety improvement.
Robert J. profile picture

Robert J.

7/10/2023

No signs of corrosion - good. Even though I am a tight wad, I just bought and installed a second set of Kodiak SS brakes on another trailer axle. The disc brake pad backing plates on this set are SS which is a big deal

by:
Kodiak brakes are great. I paid for the high quality stainless steel brakes and wheel assemblies that were well worth it. It’s been a year of use and several road trips with salt water boat launches on the ramps. So far all is well with a end of year service to ensure a good next season. I use Timkin bearings as well.
Cheers to Kodiak for the build for the product and etrailer for the discounted price supply.
etrailer is a wealth of talent with good knowledge on the products I have purchased so far for my trailer renovations.
Thanks to them
Jbuilt profile picture

Jbuilt

1/25/2021

Well after about a year on the the boat trailer all is well. It gets used on long and short trips and dunked in salt water. I’ve had it serviced to see how it looks inside and due to the fact that the Kodak hub is stainless steel there’s been no rust show up to destroy the bearings or damage the shaft spindle either. I’d recommend it to have a longer life system. BTW I have two braked axels that are all Kodiak brake and wheel components on them. In addition I chose to put electric over hydraulic on the trailer and I’m also happy with that too.

by:
Brakes went on easy, high quality. Installed stainless hubs also. Everything shipped and arrived quickly, in good shape.
by:
nice kit, as advertised
by:
It fit perfectly and was easy to install. Customer service was excellent.
Dwight profile picture

Dwight

3/7/2025

working well

Jon G. profile picture
Etrailer Expert

Jon G.

3/8/2025

@Dwight Thanks for the update!
by:
Used 2 sets on a boat trailer and went electric over hydraulic at the same time. Boat is trailering better then ever. Thinking of going with a similar setup on my toy hauler, I'm that happy with the set up. The install was easer then expected, other then needing to run hydraulic lines, it was as easy as a normal brake job on the trailer.
by:
Ordered Kodiac stainless steel disc brakes. Received timely, no hassels, no damge, good price. Although higher price for SS brakes, was tired of having brakes fail every 2-3 years, always on a trip. Comes with 5 year guarantee if I recall correctly. Excellent product. Perfect fit, easy assembly, good instructions. 1 year later no problems. Boat strictly salt water, although only out 4 times this year.
by:
I upgraded my trailer's totally rusted out (after only two years) brakes with this kit. It's now 8 years later and they still look and work like new.

If you use your trailer in salt water then these should be put on when new!
by:
Greg S and ALL the etrailer staff is top-notch.
The product is awesome, fitment is perfect...I really wish the kit would have come with twelve new stainless bolts and lock washers for the brackets but it didn’t.
by:
Bought and installed all Stainless Steel Disk Brake system on my boat trailer. Appear to still be working good. Will know more in another year.
by:
Great product and outstanding customer service. Our trailer was down in the peak of our fishing season, and Paula was excellent at assisting us in getting this product overnighted. She checked the warehouse status to make sure we would get the product on time. It is so nice to receive that level of customer attention, thank you!!
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See what our Experts say about this Kodiak Trailer Brakes

  • Stainless Steel Slip On Rotor Disc Brake Kit for 8k Axle with 5/8 inch Wheel Bolt Holes
    Hey Steve, yes we do have a version of the Kodiak disc brake kit for 8k axles that is stainless and has 5/8 inch diameter bolt holes for the wheel studs with the part # K2R858DS.
    view full answer...
  • Stainless Steel Disc Brake Kit for 8 on 6-1/2" Bolt Pattern
    Yes, there are all stainless steel disc brake kits that have an 8 on 6-1/2" bolt pattern. The Kodiak Disc Brake Kit # K2R858DS is designed for 8,000 lb Dexter axles with a #42 spindle, 4-bolt brake flange and idler hubs with 5/8" diameter wheel studs. The Kodiak Disc Brake Kit # K2R89DS is the same but fits idler hubs with 9/16" diameter wheel studs. The other kit available with an 8 on 6-1/2" bolt pattern is the Kodiak Disc Brake Kit # K2R712S which is rated for 7,000 lb axles with #42...
    view full answer...
  • Replacement Stainless Steel Disc Brake Kit Recommendation for an 8k Trailer Axle
    If you have an 8k rated Kodiak disc brake kit with 13 inch rotors on your trailer right now and are looking for a stainless kit to replace it the # K2R858DS would fit and replace it easily as long as you use the correct hub. This will come with a new mounting plate that will replace what you currently have. Since this is a slip on kit and you currently have hub/rotors you will need to replace the hubs you have with idler hubs as well. For a hub designed to fit a 8k Dexter axle you would...
    view full answer...
  • Stainless Steel Rotor, Caliper, and Additional Components for 8,000 Pound Dexter Axles
    We have a couple different options for you to upgrade the components on your boat trailer. For a kit that comes with a hub and rotor, you can use the Kodiak Disc Brake Kit, 13 Inch Hub/Rotor with 8 on 6-1/2 Wheel Bolt Pattern for 8,000 Pound Dexter Axles # K2HR89DDS. This kit comes with dacromet-plated, cast iron rotor-and-hub assemblies and mounting brackets, stainless steel calipers, and stainless steel mounting bolts. The bearings, races, and seal measurements you provided match those...
    view full answer...

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Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Kathleen M
Installed by:
Kathleen M
Employee Andy C
Installed by:
Andy C
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Hannah L
Updated by:
Hannah L
Employee Mike S
Updated by:
Mike S

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