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Hayes/AL-KO 12" x 2" Electric Brake Assembly LH

Hayes/AL-KO 12" x 2" Electric Brake Assembly LH

Item # 185100
Our Price: $129.78
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Shipping Weight: 16 lbs
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  • Reviews (10)
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  • Videos (1)
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Redline Accessories and Parts - 185100

  • Trailer Brakes
  • Electric Drum Brakes
  • Brake Assembly
  • 12 x 2 Inch Drum
  • Redline
  • LH
  • Manual Adjust
  • 7000 lbs

Hayes / AL-KO 12" x 2" Left Hand Electric Brake Assembly


  • 7,000-lb Capacity per pair
  • Mounts with AL-KO/Hayes standard 5-bolt pattern
  • Mounting bolts included
  • Driver side
  • Uses 12" hub/drums

K23-537-00 Left Side Brake Assembly for Hayes, AL-KO 12" x 2" electric brakes

Replaces 60208712, K568106.2, and K363233.2

Video of Hayes/AL-KO 12" x 2" Electric Brake Assembly LH

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Redline Trailer Brakes 185100 Review

Today we're going to take a look at the Hayes/AL-KO 12" x 2" Electric Brake Assembly for 7000-Pound Axles. This one is the left-hand driver's side assembly. Electric brakes are easier to install and offer more user control than hydraulic brakes. They require only an electric brake controller, which we so sell separately on our website. There is no actuator or hydraulic lines necessary. This assembly is a 12" x 2" driver's side electric trail brake assembly. The driver's side would be the left-hand side.

There's a sticker on it that says "Left hand," so it's marked; but, if that sticker wasn't there, just a quick tip to let you know how to determine what side this goes on. If you look at the length of the brake shoe . See this one It goes from here to here, and this one goes all the way from here all the way up to here. This is the longer brake shoe. This is the shorter brake shoe.

The shorter brake shoe will always face the front of the trailer. With that facing the front, you can see that this is the left-hand, or driver's side, assembly. These brake shoes are lined with an automotive grade friction material. This friction material is fully bonded. It's not riveted to the shoe, so it gives you a lot longer life, more braking torque. The backing plate it's connected to, that's e-coated, so it helps resist wear and corrosion.

Also, if you notice, at the very bottom the 2 adjuster plugs are included. These are nice to have, because it keeps dirt from getting into your brake assembly. If you notice, it is designed to fit the 5-bolt brake mounting flange. If you notice, the hardware is included. The mounting bolts and nuts are all included to install this. Now, a few dimensions on this.

We already mentioned it's brake assembly size 12" x 2". The measurement you're talking about, the 12", would be the diameter straight across. If we put a ruler on that, you can see there's your 12". The 2" would be the width of the shoe itself. If you put a ruler on the shoe, you can see, right at 2", so 12" x 2". The weight capacity is 3500 pounds per assembly; so, when this is matched with one on the passenger side, it would meet your 7000-pound axle capacity. Again, it is for the 7000-pound axles. This is the left-hand driver's side. It does require the use of 12" brake drums. The last thing I want to mention, too . If you notice on the back, there's 2 green wires that come out. You'll need to connect these to get your electric brakes to work correctly. One would go to your brake feed; the other goes to a ground. They're both green, so it doesn't matter. Either wire can be used for either function. That should do it for the review of the Hayes/AL-KO 12" x 2" Electric Brake Assembly for 7000-Pound Axles. This is the left-hand driver's side assembly.

Customer Satisfaction Score:

Customer Reviews

Hayes/AL-KO 12" x 2" Electric Brake Assembly LH - 185100

Average Customer Rating:  4.7 out of 5 stars   (10 Customer Reviews)

Hayes / AL-KO 12" x 2" Left Hand Electric Brake Assembly


I was very impressed with the
quality, shipping, and customer service that I obtained when purchasing my trailer brakes. Rest assure I was guided in the right direction on my purchase making sure that I was ordering the correct product for my trailer. I would recommend everyone who is in need of their trailer brakes to seek this company. They are so very helpful in every way with quality products,
Mahalo for everything..... :)


Very prompt delivery. Purchased two left and two right side assemblies to re-do a 1975 Butler tandem axle equipment trailer. The axle flanges on this trailer had the weird offset 4 hole mounting pattern and these fit perfectly.
If you have the 4 hole setup, you will need to remove the studs from your old backing plates and press them into these replacements. They do not come with replacement studs, the bolts they supply are for the 5 hole mounting and should not be used in the larger holes that require studs.


Easy install. Works well for my trailer. Only complaint is provided mounting hardware is sized for 5 hole mount. Had to go acquire 7/16 bolts for 4 hole install.


Rehabbing a '65 Safari. Breaks and electric brake assembly were shot. Ordered replacements from etrailer. Shipment arrived _ahead_ of promised date. Very happy with both the quality of the product and the service received. We'll definitely be ordering from etrailer again!


Easy to install, worked with my oddball offset bolt pattern. Drove 1,000 miles halfway across the country with no problems.


Product arrived as scheduled and was perfect fit. Thanks Etrailer!


David - 04/26/2022


Great product, it really holds up well under the harsh conditions I put it through


great product, quick shipping



See what our Experts say about this Redline Accessories and Parts

  • Replacement Trailer Brake Assembly that is 12 inch by 2 inch that Has 5 Bolt Mounting Pattern
    We have exactly what you need. You have the 5 bolt mounting pattern so you would want the Hayes/AL-KO 12" x 2" Electric Brake Left and Right hand Assemblies -7000 lbs # 185100-150. This is a 12 inch by 2 inch brake assembly that would work great for you. I attached a review video for you to check out as well.
    view full answer...
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  • Size of Center Hole on Hayes/AL-KO 12 x 2 Inch Electric Brake Assembly # 185100
    The center hole diameter on the Hayes/AL-KO 12 x 2 Electric Brake Assembly, part # 185100, is 3-1/4 inches (3.25). This # 185100 brake assembly has the standard 5-bolt mounting pattern. For the standard 5-bolt mounting pattern the distance between the bolt holes is 2-1/8 inches on center except for the bottom 2 holes. The 2 bottom holes are 3 inches apart on center.
    view full answer...
  • Is Brake Magnet Supposed to Continuously Ride on Armature Surface of Brake Drum
    The brake magnet can indeed be in direct contact with the armature surface of the brake drum, regardless of whether or not the magnet is energized. This doesn't present a problem unless the drum is worn and has grooves in the armature surface. Because the magnet and the armature are in contact, the grooves can transfer to the magnet, making it less effective. This is why we recommend that folks check the armature surface of the brake drum when they replace the brake magnet. In some cases...
    view full answer...
  • Do all Trailer Brake Assemblies Wear Out at the Same Time
    The brake assemblies of all axles should wear at the same rate assuming they are all adjusted the same. All of the wheels would be spinning at the same speed and if the brakes are all applying the same braking pressure they would all wear out at the same time. If any of the assemblies are worn then most likely they all are worn, but if you check the condition of all of them and only a few are worn out somehow you would only need to replace the worn out assemblies.
    view full answer...
  • Brake System Recommendation for 5200 lb Trailer
    Electric brakes are typically the most cost effective option. I'll link you to an FAQ article that explains the parts necessary to add brakes to a trailer that doesn't currently have them. In order to spec a braking system for you, I'll need some more information: Reference numbers from inner and outer wheel bearings Wheel bolt pattern (see linked article) Confirmation of axle capacity The existing axles will need to have brake mounting flanges in place, to provide a mounting point for...
    view full answer...
  • Do Trailer Drums have to be Turned when Replacing Electric Trailer Brake Assemblies
    If the surface on the inside of the drum where the shoe pads make contact isn't smooth then a brake shop may be able to turn the drums. If that surface or the surface where the magnet makes contact (called the armature surface) is discolored then the drum will need to be replaced. In most cases, unless there is damage or discoloration, the drums will not have to be serviced or replaced. If you are unsure then the safest thing to do is take the drums to a brake shop to have them inspected.
    view full answer...
  • Electric Trailer Brakes More Aggressive After Changing Vehicles and Repacking Bearings
    If you were to get bearing grease on the brake pads then they are pretty much done and would have to be replaced because you will never be able to get all of the grease off of them. It doesn't sound like grease is the problem though because the grease would make the brakes not work as well, not make them more grabby. I think the issue might actually not be an issue at all. I think the newer vehicle and brake controller are working a little better than the old one. It also might take a...
    view full answer...
  • What is the Size of the Center Hole for AL-KO 12 x 2 Inch 9-Hole Electric Brake Assembly
    I went out to the warehouse and pulled brake assembly # 185100 to measure the center hole for you. I used a set of digital calipers and came up with 3.24 inches so just a hair under 3-1/4 inches.
    view full answer...
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  • Is Hayes Al-KO Assembly part # 185100 Just the Brake Assembly
    The Hayes Al-KO Assembly part # 185100 that you referenced is just the brake assembly and does not come with a drum as well. You'd have to pick that out separately. I'd need to know what bolt pattern your current wheels are as well as the dimensions of your trailer spindle or the old bearing numbers.
    view full answer...
  • Typical Mileage Lifespan from Magnets in Electric Trailer Brake Assemblies
    The three sizes of electric trailer drum brakes you referenced, 7-, 10- and 12-inch diameters, are intended for different axle weight capacities. Since each size will presumably have a proportionate weight load it has to stop, their wear rates will not vary too much. It cannot be generalized that one size or another will last longer because they are all asked to do about the same work relative to their rated capacity. The term "normal driving" means different things to different people....
    view full answer...
  • How to Check Magnet Wear on Electric Trailer Brakes
    A brake magnet such as the one on the Hayes/AL-KO # 185100 that you referenced or the brake magnet depicted in your photo does not visually look “worn out” and they do not have hole type wear indicators. If the inner coil of the magnet is exposed then you could say they were worn out – much like belts showing through on a worn out tire. If you want to assess them further I would follow the guide that I have posted a link to. Also, if you find excessive corrosion on the other parts and...
    view full answer...
  • Availability of Compatible Electric Brakes for Old Travel Trailer with 7000-lb Axles and 6-Bolt Hubs
    We offer several electric trailer brake assemblies for 7000-lb axles, including the Hayes # 185100-150 which is a left-hand and right-hand brake assembly. These 12 x 2-inch brakes mount to 5-bolt brake flanges. The link will let you see all electric brakes compatible with 7000-lb axles. If your current hubs use bolts to secure the wheels (rather than the more common lug nuts) you may be able to install screw-in studs in the hub's threaded holes that will then allow use of lug nuts to actually...
    view full answer...
  • Replacement Electric Drum Trailer Brakes for Hayes 12x2 Inch Brakes
    The dimensions that you have provided match those of Hayes brake assembly # 185100-150. It will fit in place of your existing brakes. The braking will be more aggressive considering the capacity of the brake is for 7k axles. You can circumvent this by adjusting the brakes a little weaker than you normally would.
    view full answer...
  • Brake Assembly Replacement Recommendation for Al-KO 7k Trailer Axles
    Are the brake assemblies 12 inches in diameter and have 5 bolt that secure it to the mounting flange? If so, this is what you need. For a 7,000 lb AL-KO axle you would want a Hayes/AL-KO brake assembly # 185100-150 for the pair.
    view full answer...
  • Replacement Al KO 363233.1 and 363233.2 Brake Assembly Availability
    We have what you are looking for. To replace the parts 363233.1 and 363233.2 you would want the part # 185100-150. These are the exact same as the parts you are looking for. These are 12 inch by 2 inch assemblies with a 7,000 lb capacity.
    view full answer...
  • Are Replacement Hubs And Drums Required When Replacing Brakes On Older Trailer
    The Hayes/AL-KO Electric Brake Assembly, part # 185100-150 is designed to replace Kelsey Hayes brake assemblies with 5-bolt mounting pattern, and is used with a 12 inch hub/drum. This includes both the left-hand and the right-hand side. We do not offer any 12 x 2 brakes for 7,000-lb axles that work with a 4-bolt brake mounting flange. The capacity for these brakes is 7,000 lbs for the pair. As far as the drums and hubs are concerned, you will want to inspect them for excessive wear...
    view full answer...
    Image 1 for
  • Ways to Identify Axle Capacity of a Trailer
    If you check the plate of the trailer that has the VIN and weight ratings for the trailer there should be axle ratings listed as well. This plate is often near the coupler of the trailer on the frame. Typically you can tell the capacity of a trailer axle by the diameter of it. Typical Axle Diameters Based on Axle Capacity - 1,000-lb - 2,000-lb Axles: 1-1/2 inch - 1-3/4 inch diameter - 3,500-lb Axles: 2-3/8 inch diameter - 6,000-lb - 7,200-lb Axles: 3 inch diameter - 8,000-lb Axles:...
    view full answer...
    Image 1 for
  • Weight Capacity of Hayes/AL-KO 12
    The Hayes/AL-KO 12" x 2" Electric Brake Assembly #185100-150 has a weight capacity of 7,000 pounds per pair. I have included a video for you to check out.
    view full answer...
  • Do the Hubs/Drums Need Changed When Replacing the Braking Assemblies
    To summarize, you have 12" x 2" Hayes Braking Assemblies with round magnets. If the magnets have failed then you would need to replace the entire braking assemblies as they no longer offer these magnets as replacement parts. Therefore, I recommend the Hayes/AL-KO Electric Trailer Brake Kit part # 185100-150 which use a five bolt brake mounting flange. If the hub/drums that you have now are not out of round then you can reuse them with the Hayes/AL-KO Electric Trailer Brake Kit. You would...
    view full answer...
  • Which Wire of Trailer Brake Assemblies is Ground and Power
    Trailer brake assembly wiring isn't polarity sensitive. That means either wire can be the power wire as long as the other is grounded.
    view full answer...
  • Capacity of Trailer Hub Stamped Al KO 7,200
    That certainly looks like an Al Ko 7,200 lb axle hub/drum. With that in mind you should check the plate on the trailer that has the VIN as well as that will tell you the trailer's overall capacities as well.
    view full answer...
    Image 1 for
  • Replacement 12 inch by 2 inch AL KO Brake Assemblies
    Thanks for the picture. I was able to determine that you have Al Ko 12x2 inch brake assemblies. The right-hand side and the left-hand side come together in part # 185100-150. AL KO assemblies use a slightly different 5-bolt pattern so you have to stick with ones that are made specifically for them.
    view full answer...
    Image 1 for
  • Replacement Brake Assemblies for Trailer Axle with 12 inch AL KO Brake Assemblies
    Since you have a set of 12 inch Al KO brake assemblies on your trailer you will need to replace them with the part numbers # 185100 for the left hand side and # 185150. These use a unique 5 bolt pattern that the more standard assemblies out there don't quite match.
    view full answer...
  • Replacement Braking Assemblies For A Tandem Axle 1963 Avion T27
    Yes, that is correct. For a tandem axle trailer, you'd need two of the left and right hand assemblies # 185100-150. These braking assemblies measure 12" in diameter, 2" wide, has a 5 bolt mounting pattern, will fit wheels sizes 14-1/2" to 16", and will work with axles rated 7,000lbs.
    view full answer...

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