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Dexter Electric Trailer Brake Assembly - 12" - Left Hand - 6,000 lbs

Dexter Electric Trailer Brake Assembly - 12" - Left Hand - 6,000 lbs

Item # 23-105
Our Price: $92.23
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Shipping Weight: 15 lbs
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23-105 - LH Dexter Trailer Brakes
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12" x 2" Driver's-side electric trailer brake assembly fits 6,000-lb axles. Mounting flange has a 5-bolt pattern. Fits 14-1/2" to 16" wheels. 1-800-940-8924 to order Dexter accessories and parts part number 23-105 or order online at Free expert support on all Dexter products. Great prices and Fastest Shipping for Dexter Electric Trailer Brake Assembly - 12" - Left Hand - 6,000 lbs. Accessories and Parts reviews from real customers.
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Dexter Accessories and Parts - 23-105

  • Trailer Brakes
  • Electric Drum Brakes
  • Brake Assembly
  • 12 x 2 Inch Drum
  • Dexter
  • LH
  • Manual Adjust
  • 6000 lbs

12" x 2" Driver's-side electric trailer brake assembly fits 6,000-lb axles. Mounting flange has a 5-bolt pattern. Fits 14-1/2" to 16" wheels.


  • Electric brakes are easier to install and offer more user control than hydraulic brakes
    • Requires only an electric brake controller (sold separately) - no actuator or hydraulic lines necessary
  • Adjuster plugs (included) cover access holes to keep dirt and grime out of the assemblies and off of the shoes
  • Mounting bolts sold separately
  • Made in the USA


  • Application: most standard hub-and-drum assemblies, including Dexter, Lippert (LCI), and AL-KO
  • Configuration: left hand (driver's side)
  • Dimensions: 12" diameter x 2" wide
  • Mounting flange bolt pattern: 5 bolt
  • Wheel size: 14-1/2", 15" or 16"
  • Axle rating: 6,000 lbs
  • Limited 5-year warranty

Exploded Electric Brake Assembly

K23-105-00 Dexter Electric Brake Assembly, LH - 6,000 lbs

Replaces 23-105

Customer Satisfaction Score:

Customer Reviews

Dexter Electric Trailer Brake Assembly - 12" - Left Hand - 6,000 lbs - 23-105

Average Customer Rating:  4.9 out of 5 stars   (156 Customer Reviews)

12" x 2" Driver's-side electric trailer brake assembly fits 6,000-lb axles. Mounting flange has a 5-bolt pattern. Fits 14-1/2" to 16" wheels.


Quality product and strainer staff are knowledgeable and answered all of my questions


Parts all fit properly and worked great. Good product.

The brakes have been in for a year and work great. Installation was really easy. They came well packaged and with everything needed.
Al - 09/25/2021


Wonderful service, exact replacement, delivered promptly!


Superb service. All items were packaged and shipped shortly after order was confirmed. Parts were received on time and well packaged. Currently at shop to be installed.


East to install and adjust. Once on the road broke in easily and they do a great job stopping my toy hauler.


First shipment of two 23-105, and two 23-106 arrived with grease contamination soaked into the lining on two assemblies and impact damage to the lining on a third. etrailer shipped three replacements promptly. Sticker on carton said "quality checked by Alex G. Perhaps Alex should find another line of work.
My major issue however is that after installing these I had to crank the power on my controller to maximum to achieve any helpful braking and can't even come close to wheel lockup which you need to adjust properly. I noticed that the new magnets were oval shaped unlike my old ones which were longer and flat on top and bottom (like the magnets pictured on the 7000lb assemblies). I assumed the style had simply changed since my magnets were made and I had no reason to look at 7000lb brakes as my axles are tagged 4400lb. All instructions on etrailer site state to select the brakes by the weight of your trailer which in my case is 9000lbs. Surely four 6000lb brake assemblies would be overkill..WRONG! My axles are 7000lb "de-rated" to 4400 but they obviously had 7000lb brakes. This caveat has caused me to install the wrong brake assemblies! If you are replacing your brakes and wish to duplicate your stopping power, do NOT listen the the "expert" answers on here. Compare the shape of the magnets. These small oval magnets are not as strong and braking will suffer. I still feel as though I should be able to achieve wheel lockup with these but not the case and since they have now been used, I can not return them.

Double check the adjuster down at the bottom of the brake assemblies. That adjuster should be used when the brakes are first installed. Use the adjuster to open the assemblies so that theyre putting a slight and even amount of drag on the wheel as you spin it by hand. If you have used the adjuster as outlined above and the brakes still will not engage properly, give us a call at 800-298-8924 and our Techs will help diagnose.
-- Etrailer Expert Patrick B - 10/14/2015


I checked here locally on the cost of trailer brake shoes and magnets and found the price of etrailers' complete brakes and magnets assembled on a new backplate was by far less expensive. After removing the drum, this meant near zero labor, just five nuts to remove and replace the backplate then splice the wires. And another BIG plus, free shipping on an over thirty pound shipment. Wow so easy...And now I have all new brakes, magnets and all the other parts too, just seems to good to be true. I will continue to tell everyone about this labor saving and great priced product. Thank you

Now a year later and 3,500 miles without any problem or issues. Looking back I am very pleased with my purchase and the excellent service provided by eTrailer. Thanks so much. Stay safe...
Edward S - 04/12/2020


The product is good but the packaging was insufficient and it arrived damaged. I was able to source a replacement from elsewhere and just never had time to follow up...


I bought a used toy boxa and quickly found out that the breaks were mowed down. I had trip planned to Yellowstone so, I needed these fast. They showed up on time and were the right part. I put them on drive from SoCal to Yellowstone which is 1500 miles. I re-adjust the break one morning in Yellowstone and haven’t looked back. Thank you!!!! Here is a picture of my trailer in Idaho. We camped here one night before we got to Yellowstone.


This was just what I needed to upgrade the brakes on my trailer and very easy instructions


Great replacements


I was replacing the brakes on a 72 Airstream Argosy and needed a magnet but found out I could get whole new assemblies for $2.00 more! That's a deal! Just make sure if your backing plates have attached studs that you pick up the necessary grade 5 or 8 bolts, nuts and lock washers too.

Worked just fine. Sold the trailer
-- comment by: Terry N - 04/10/2014


I replaced the electric brakes on my dump trailer, and bought the Dexter 6000 lb set, fully assembled and ready to bolt on. They fit perfectly and are of the quality that I expected for American made products. I am very happy with my purchase.


Been a year, so far so good!


The new brakes work well on my trailer. However, when I replace them next time I will spend the extra $$ to get the self adjusting version.


I am writing this very favorable review of my online shopping experience with etrailer. Recently I had to replace the brakes, hubs, wheels and tires on my travel trailer. Please keep in mind that I am a 65 year old man without a lot of experience with online shopping. Never-the-less, I decided to give it a try in hopes of saving some money. To my surprise, etrailer made the experience very easy and painless. Before I placed my order on line, I had a question about one of the items on my shopping list, so I placed a call to them. I spoke with a very lovely and patient Customer Service Representative by the name of Michelle S. She was very helpful in answering my questions and encouraged me to call her back directly when I was ready to place my order; and so I did. During the shipping process, she kept me informed through emails the status of my order and everything arrived on time and in great shape. I truly appreciate the personalized services I received doing business with etrailer. They truly removed all of the uncertainty and nervousness of shopping online.


Best value for genuine Dexter parts


Less work than buying all the parts separately. Parts came in good physical condition. However, on 1 of the 4 assemblies, the adjuster and adjuster spring was loose in the packaging but was easily made whole.


EXCELLENT...... START TO FINISH. Fantastic service, great prices, quality products. Here's a before and after picture. It only took 30 minutes and basic tools to make the replacement. So much better than trying to clean up the old rusty one. Thanks again, Bill Borland in Michigan


These parts were made by Dexter and were an exact replacement for my Dexter axles.


Well built not goodvto put everything in one box ups destroyed the box parts were all there . Yea


Easy assembly...


Good quality material and excellent ser vice


Could bot be happier with the service in getting the right brakes. Better service than my local trailer shops. Thank you!


Good price, great quality, easy install ation.

After a cross country trip, I have to say I am very pleased with the product performance. I would recommend etrailer and its products to everyone I know.
Bill - 09/25/2021

Show More Reviews

See what our Experts say about this Dexter Accessories and Parts

  • What is the Difference Between Dexter Trailer Brake Assemblies # 23-105-09 and # 23-105
    The difference is the mounting pattern. The Dexter # 23-105-09, brake assembly that you have referenced will mount to either an AL-KO/Hayes 4 bolt or a standard 5 bolt mounting flange. The # 23-105 just fits the standard 5 bolt pattern. Otherwise the specs are the same: 12 inch by 2 inch 6,000 pound axles Manual adjust Left hand side
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  • Comparing Trailer Brake Assembly # 23-105 and # 23-105-09
    Trailer brake assembly # 23-105-09 is specifically designed to fit AL-KO/Hayes axles which are not as common as other axles. Brake assembly # 23-105 fits Dexter axles and other more common axles. If you have an AL-KO/Hayes axle, then I would go with them.
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  • How to Adjust Electric Drum Trailer Brakes
    You are correct. On drum brakes that do not self-adjust, you would manually adjust the brakes using the star wheel on the assembly. Once you cannot turn the wheel, you turn the star wheel the other direction until the wheel can spin and you hear a slight constant drag on the brakes. If the brakes are not constantly dragging it could indicate wear on the shoes or drum. I have included a link to a video and at about the 4:39 mark our installed begins adjusting the brakes.
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  • After Replacing Trailer Brakes, Worn Parts, and Brake Controller the Trailer Brakes are Weak
    One possibility is that you have a weak ground for the brake magnets. Check the grounds and make sure they are attached to clean and corrosion free bare metal surfaces. Do the same with the main trailer connector and vehicle side grounds. You will need to adjust the brakes since you have replaced the old ones. I have included a link to a video that should help. At about the 4:24 mark, our installer adjusts the brakes. They should be adjusted so that they drag lightly but constantly when...
    view full answer...
  • How Often Should Electric Trailer Brake Shoes be Changed
    You cannot really go by miles when determining when brakes should be replaced. You would know to replace them the same way you would know with a vehicle. If performance is suffering and adjusting the brakes does not help and there are no other issues causing the poor performance it is probably time to change the brake shoes. Different applications, loads, driving styles and other factors have an effect on how quickly brakes will need replaced. Adjust the brakes every 3,000 miles or when...
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  • What is the Difference Between Dexter 6k and 7k Electric Drum Trailer Brake Assemblies
    Electric drum brake assemblies for 6k and 7k axles both use the same 5 bolt mounting pattern. The 7k brakes will have a stronger magnet and will provide more braking. If used on a 6k axle a 7k brake assembly can be too aggressive but it could be used. The literature for the trailer should indicate the axle capacity somewhere. There may also be a sticker or plate on the axle with the capacity. It might also be stamped into the metal of the axle. I have included links to the 12 x 2 inch...
    view full answer...
  • Troubleshooting Electric Trailer Brake Assembly That is Running Hot
    I would recommend completely ruling out the bearings by closely examining them and the spindle for discoloration caused by overheating. If you have determined that it is the brakes that are hot, and not the hub itself, I would recommend readjusting the brake assembly. What you are experiencing could certainly happen if the brake assembly was out of adjustment. To adjust the brake assembly, jack up trailer and secure on adequate capacity jack stands. Check that the wheel and drum rotate...
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  • How Long Should it Take to Remove and Install a 6,000 Pound Trailer Axle
    The axle should be held on to the suspension with u-bolts so unbolting those should not take long and the axle should come right off. This is if the leaf spring stack is on top of the axle and I imagine, barring any unforeseen problems, that it would take no more than a half hour including putting the new on on. This would be if you had an assistant. If the leaf spring stack is below the axle then it will take a little longer because you will need to also remove the leaf spring stack so...
    view full answer...
  • Recommended Torque Value For Installing Brake Assembly to 3500# Axle
    My contact at Dexter Axle tells me that when installing a brake assembly to the backing plate of a 3500 lb axle, the bolts should be tightened in a criss-cross pattern to between 45-70 foot lbs.
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  • How to Determine the Size Electric Drum Brakes are Needed on a 2012 Montana
    In order to determine the size of the brakes on your Montana you will have to pull off the wheel and the hub and drum assembly. Then you will measure the inner diameter of the drum and the width of the surface the pads make contact with in the hub. I have included a picture showing the measurements in question. You may be able to look at the back of the brake assembly for the make and model number stamped into it. With that information I may be able to determine what brakes you have.
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    Image 1 for
  • Finding Reason For Brakes to be Seized Up When Removing Trailer From Storage
    If no power is being sent to the trailer brakes, either by the brake controller or the break away system, the brakes should not be applied. The fact that the trailer isn't plugged into a tow vehicle and the break away battery has been removed completely rules out any electrical reason for the brakes to be locked. This leaves mechanical causes. You'll need to pull the wheels and hubs anyway, as they really should be repacked yearly. At this time you can inspect the brake assemblies to make...
    view full answer...
  • Troubleshooting Low Brake Output Voltage
    First thing I would check is the blue wire that is at the rear of your vehicle for voltage when you apply the brakes and when you slide the manual override of this controller. You could also try sliding the manual override a few times and adjusting the gain knob up and down to help clear the contact points. If all this checks out it sounds like the problem is in the trailer somewhere. I would first check all the grounds of the trailer and make sure they are making solid corrosion-free...
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  • Which Way Should Star Wheel Turn When Adjusting Dexter Electric Brakes
    You should be turning the star wheel up to tighten your electric brakes, as you mentioned. This could mean they are improperly mounted and I recommend taking a look at your brake assemblies to see how they were put on. You will need to disassemble your hub to do this but you'll want to make sure your brakes were correctly put on. I've added a link to a video which shows how 12" Dexter brakes should be installed for you to use as a reference.
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  • Troubleshooting Trailer Brakes That Will Not Disengage
    It sounds like you may be having some wiring issues; but first, start by checking your connectors to see if there is any corrosion that may be hampering their functionality and keeping your brakes engaged. To disengage your brakes, cut the power wire and that should disengage them. Then go over the wiring to try and look for any that are crimped, broken, or otherwise damaged. If you cut the wires that are feeding your brakes power and they still do not disengage, you will need to go to...
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  • Why Would Electric Trailer Brakes Lock Up When Hub is Spun Backwards
    There's something mechanically wrong with the brake assemblies or you have a drum that needs to be replaced or turned. Electric trailer brakes should not lock up when turned in reverse. Especially if there's no current involved on any of the wiring. That means it's a mechanical problem. Something in the linkage much be catching as the hub turns which is then pushing the shoes apart and activating them.
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  • Troubleshooting Trailer Brakes that Lock Up When Brakes Are Touched
    Sounds like your trailer wiring connector on your Ford F550 has the brake output and stop light circuit shorted together and when you apply the brakes the full 12 volts that is supposed to go to your trailer lights is going to your brake assemblies and locking them up. What you will want to do is clean the pins of the connector on your truck and then check the wiring of the connector looking for any cut or exposed wire and fix as necessary.
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  • Troubleshooting Integrated Brake Controller that Only Works With Override Lever
    Sounds like the stoplight circuit signal isn't making it's way to the integrated brake controller of your truck so it's stopped working with the brake pedal. Since this is an integrated controller most likely the problem is a blown third brake light fuse. Replacing the fuse should fix the problem.
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  • Bolt Torque for Installing 12 inch Brake Assemblies on 6k Axle
    I spoke with my contact at Dexter and she informed me that you will need to tighten the attachment nuts to 30-35 ft-lb when installing 12 inch Electric Brake Assembly, part # 23-105, on your Dexter 6000 lb axles.
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  • Electric Trailer Brakes Just Started to Lock Up when the Trailer is Connected to Tow Vehicle
    Since the brakes are locking up when the trailer is connected and release when the trailer is not connected then the brake magnets have to be wired to something. My guess is that the 5-Pole was not original on the trailer and the previous owner used some alternate wiring for everything. First we need to get the wiring right as far as which wires does which function. I have included a link to our help article on trailer wiring with diagrams that show the functions of vehicle and trailer...
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  • Troubleshooting New Electric Trailer Brakes That Engage Only Weakly
    Brand new electric (and hydraulic) trailer brakes, even adjustable types, can take some time to settle in after installation. In general it is best to do several test runs at 40 mph before adjusting the brakes. You will want to hook up your truck and trailer, drive around and apply the manual override from your in-cab brake controller. Set the controller power and/or boost to maximum. You will want to start around 40 mph and use ONLY the manual override to slow down the truck and trailer....
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  • How to Pick Out Trailer Hubs for a Boat Trailer with Surge Brakes and Unknown Hubs
    In order to pick out the correct hub assembly for a trailer you are going to need know a few key pieces of information. The first thing you will need to know is the bolt pattern of your hubs. This is so you get a hub that is compatible with your wheels. I attached an FAQ article on determining bolt pattern for you to check out. Next thing you will need to know is what spindle you have on your trailer. In order to do that you can either get the inner and outer bearing numbers from a hub...
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  • Troubleshooting Weak Trailer Brakes Where One Magnet Does not Activate
    Since you ordered new brake assemblies I would think that once you install those and properly set the brake tightness you would be good to go. If the one magnet wasn't getting any voltage to it then that would explain why that assembly wouldn't activate. The voltage you tested for at the trailer connector would be normal if your controller was set for 5.25 volts as the max gain. For proper initial trailer brake assembly setup check out the video (see link). Beginning at the 4:23 mark,...
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  • How to Measure 5 Lug Trailer Wheel to Determine Bolt Pattern
    You most likely have a 5 on 4-1/2 inch bolt pattern but you would want to re-measure to be certain. The following dimensions from one stud center to the other will tell you which you have: 2-5/8" - the bolt pattern is 5 on 4-1/2 2-3/4" - the bolt pattern is 5 on 4-3/4 3" - the bolt pattern is 5 on 5 3-1/4" - the bolt pattern is 5 on 5-1/2 It also doesn't look like you have a standard trailer tire size on your trailer either. The closest we have is the 205/75-15 which I attached a link...
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  • How to Determine Proper Brake Assemblies for Chaparral Lite 5th Wheel
    I don't have a reference source that would tell me what brake assemblies were used on your fifth wheel, so to determine the correct brake assemblies needed, we'll need to do a bit of detective work. The brake assemblies you need will depend on the diameter and depth of your brake drums, the number of bolts the existing brake assembly uses to mount to the brake mounting flange and the axle's capacity. To get the correct size (10 x 2-1/4 or 12 x 2 inch are the most common) you would measure...
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