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If your old brakes are dragging or weak, this Dexter Electric Trailer Brake Kit gives you a fresh start. Each side comes fully assembled—driver’s-side and passenger’s-side—so all you have to do is bolt them on. With 12-1/4" x 2-1/2" shoes sized for 8,000-lb axles and 16" or larger wheels, these brakes deliver solid, even braking that restores smooth performance and control.
Hydraulic lines and actuators aren’t needed here. These electric brakes work directly off an in-cab brake controller, giving you easy installation and fine-tuned control from the driver’s seat. Just connect the two wires per assembly and you’re ready to dial in your braking force whenever the load or terrain changes.
Each assembly mounts to a standard 4-bolt brake flange, making it a direct fit where older 8K drum brakes came off. Mounting bolts and hardware are sold separately, but the layout lines up cleanly—no drilling or modification required. It’s a straightforward job for anyone doing a DIY axle service or trailer rebuild.
When you’re hauling heavy gear, you want brakes that can keep pace. This kit is rated for 8,000-lb axles, giving you the stout hardware and friction surface area needed for consistent braking under load. It’s a dependable option for anyone towing big equipment or carrying serious weight.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hello everybody. This is Jeff at trailer.com. Today I'm gonna take a look at the Dexter 12 and a quarter inch right hand and left hand side self-adjusting electric trailer brake assemblies for 8,000 pound axles. Now these electric brakes are easier to install. They offer more user control than hydraulic brakes. Basically, they only require an electric brake controller, which we do sell separate on our website.
There's no need for any brake actuator, hydraulic lines necessary. The brake shoes themselves they are lined with an automotive grade friction material and that friction material is fully bonded to the shoe. It's not riveted to the shoes. Gives you a lot longer life, more braking tort. And these are self-adjusting brakes which will automatically adjust to deliver optimum performance and braking power.
And the way you can tell they're self-adjusting, you can see this cable that runs around this wheel, attaches to a lever down here that automatically turn the adjustment wheel as needed. There's no need for any manual brake adjustments after the initial adjustment. The proper adjustment leads to a lot better brake efficiency unless we're on your tow vehicle's brakes. Now this kit here will include both the 12 and a quarter inch by two and a half inch side, driver side, and passenger side electric trailer brake assemblies. And when we say 12 and a quarter inch by two and a half inch, what that measurement stands for is the 12 and a quarter inch is gonna be the diameter from this shoe to this shoe.
So you can see if we put a ruler on it there's your 12 and a quarter inch diameter and the two and a half inches is gonna be the width of the brake shoe on the pad. And there's your two and a half inch measurement there. The other thing I wanted to talk about was how you can tell one is a left hand driver's side one is a right hand passenger side. Of course, when you get a new assembly they'll have a sticker there. It'll tell you that.
But if by chance that sticker wasn't on there and you just had to look at it and tell the easiest way is to look at the length of the pad that's on the brake shoe. So if you look at this pad, it goes from here to here and this pad here goes all the way from here to here. This is the longer pad. This is the shorter pad. The shorter pad is your primary shoe which means the primary shoe will always face the front of the trailer. So that's gonna go this way. And that's gonna tell you that this is the left hand driver's side. And same way on the passenger side. The shoe goes from here to here, over here from here to here. This is the longer, this is the shorter. So the shorter faces the front, that's gonna tell you it's the right hand passenger side assembly. Now the mounting hardware to install these assemblies is not included. We do sell those separately. Usually they're listed on this product page as a related product. It does use a brake flange or brake mounting flange bolt pattern of four holes. And these parts are made in the USA. Few specs, again, the application these will fit most standard 12 and a quarter inch hub and drum assemblies. The wheel size that'll fit on these is 16 inches and larger. Now the weight capacity on these assemblies is 4,000 pounds per assembly. So when they're together on the same axle it'll meet your axle rating of 8,000 pounds. And one last thing I also wanna mention you notice on electric brakes you'll see two wires on the back of the brake. Those two wires need to be connected. One goes to a ground, other goes to a brake feed for power and they're the same wires, same color. So you can use either wire for either function. But that's gonna do it for the review on the Dexter 12 and a quarter inch right hand and left hand side self-adjusting electric trailer brake assemblies for 8,000 pound axles.
Customer Satisfaction Score:
92% were satisfied with this product
8% of customers were not satisfied
Ratings & Reviews

Nick S.
11/17/2025
Well I am glad you were able to find the source of the issue and get that fixed! It is great to hear the new ones are working well and fit perfect. What kind of trailer did you install these on?

Nick S.
1/19/2026
That is a great setup you got! I am glad the brakes got their quickly and you were able to get them installed. What are you using that trailer for?

Michael
10/21/2026
Brakes working great, great product
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David, C.
8/31/2026
Nothing further to add. In this case , thats a good thing. Works as it should with zero problems. Buy USA.