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Dexter Axle Trailer Brakes - Hydraulic Drum Brakes - 23-398-399 Review

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Review of Dexter Trailer Brakes 23-398-399

Male speaker: Today, we're gonna take a look at the Dexter 7-inch hydraulic trailer brake kit, with the left- and right-hand brake assemblies for 2500-pound axles. Now, hydraulic drum brake assemblies are designed to use with surge-type trailer brake actuators. These assemblies are manual adjustment brakes, so they do require a periodic manual adjustment. Right down here is your adjustment gear, where you'd adjust them. On the backing plate, there's an access hole at the bottom that you put your tool through to do your adjustment. What's nice on these brakes, if you notice, they have an adjuster plug that goes in there when you're not using it, so that hole's covered up.

It keeps any dirt and grime from getting into your brake assembly and off your brake shoes. This part number will include both the left-hand driver's side, right-hand passenger's side brake assemblies. You can notice all the mounting nuts are included to install it. The dimensions on these assemblies is 7-inch diameter by 1 3/4-inches wide, and the size on that, the 7 inches of diameter would be from this shoe all the way over to that shoe. So if we put the ruler on, there's your 7-inch diameter. The 1 3/4-inch width would be the width of the pad on the shoe.

There's the 1 3/4 inches. If you notice on the back, there's the four bolts. That's the mounting flange bolt pattern, is a four-bolt mounting flange, and again, there's your nuts that you'd install them with. Now, these assemblies do require the use of a 7-inch brake drum. The wheel size that'll fit on these is 10-inch, 12-inch, and 13-inch.

Again, these are designed for axles rated up to 2500 pounds. The last thing I wanted to show you is, how to tell the difference between the left-hand driver's side and right-hand passenger's side. On a new assembly of course, there'll be a sticker that'll tell you that, but if that sticker wasn't there, the easiest way to tell is you look at the length of the pad on the shoes. So this pad goes from here to here, this one's from here to here. This is a shorter pad, that's the longer pad. Shorter pad always faces the front of the trailer.

It tells you that this is the right-hand passenger's side assembly. If you go over to the other one, the pad goes from here to here. This one's from here to here. This is the shorter pad, this is the longer pad. Shorter one faces the front of the trailer. This is the left-hand driver's side assembly. That should do it for the review on the Dexter 7-inch hydraulic trailer brake kit with left- and right-hand brake assemblies for 2500-pound axles.

Phil R.


the measurement of the pads is a nice touch, but it would be nice to give the measurements of the center of the mounting bolts to center on the back of the brake assembly, and are lock washers required with them nuts for the mounting? nice job thanks

Etrailer Expert

David B.


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Employee Jeff D
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