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Dexter Axle Trailer Brakes - Electric Drum Brakes - 23-438-439 Review

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Review of Dexter Trailer Brakes 23-438-439


Today I'm going to take a look at the Dexter 12 and 1/4 inch self-adjusting electric trailer brake kit, with the left and right hand brake assemblies for 10,000 pound axles. Now, electric brakes, they're easier to install. They offer more user control than hydraulic brakes. Basically, they require only an electric brake controller, which we do sell separately on our website. There's no actuator, hydraulic lines necessary with electric brakes. These brakes happen to be self-adjusting brakes and you can tell that by the cable, goes around the pulley, attaches to the lever down here that'll automatically adjust the brakes. There's no need for manual brake adjustments.

Of course, being automatically adjusted gives you proper adjustment, which will lead to better brake efficiency and less wear on your tow vehicle's brakes. This part includes both the left hand driver side, right hand passenger side brake assemblies. All the mounting bolts and hardware is sold separately. A few specs on this. The dimension on these brake assemblies is 12 and 1/4 inch diameter by 4 inches wide, so the diameter would be measured from this pad all the way over to this pad. If we put the ruler on that, there's your 12 and 1/4 inch diameter.

The width would be the width of the pad on the brake shoe. If we take the ruler, measure the width, there's your four inches wide. Just let me turn this to the back here and you can see the seven holes, so it does require a brake mounting inaudible 00:01:15 bolt pattern of seven bolt holes. It does require the use of 12 and 1/4 inch brake drums. The wheel size that'll fit on these assemblies is 15 inches or larger, and again, they are designed for axles rated at 10,000 pounds. These are electric brakes, so if I show you the back here you'll see there's two yellow wires coming out, they do need to be connected.

One goes to the brake feed, the other goes to a ground and they're both yellow wires so either wire can be used for either function. The last thing I just want to show you is how to tell the difference between the left hand driver side and right hand passenger side. On a new assembly, of course, will have a sticker and that sticker will tell you what side it goes on, but if the sticker wasn't there the easiest way to tell is look at the length of the pad on the brake shoe. This pad goes all the way from here to here. This one's just from here to here, this is the shorter pad. The shorter brake pad is the primary shoe, that'll always face the front of the trailer, so that tells you this is going to be the left hand driver side assembly.

On this one, again, the pad is all the way here to here. This one's just here to here, that's the shorter pad, the primary shoe. That's going to tell you this faces on the right hand passenger side of the trailer. That should do it for the review on the Dexter 12 and 1/4 inch self-adjusting electric trailer brake kit, with left and right hand brake assemblies for 10,000 pound axles.


Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee David F
Installed by:
David F
Employee Dustin K
Video Edited:
Dustin K

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