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How to Determine Trailer Axle Capacity to Find Parts to Add Brakes to Trailer

Question:

I am doing some work to a boat trailer I recently acquired. I want to replace the old frozen surge brakes with some electric brakes but am having a hard time telling what axle I have and from the videos it seems important/easy to find out. No labels or stamps that I could see. I could send some pics of it if that would help. It is a galvanized double axle boat trailer...

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Expert Reply:

We can figure it out with either the bearing numbers that are in your hub, or the diameter of your axle. Those are the most reliable ways to figure it out when there's not axle info sticker.

I also attached a help article to this page that details how to pick out the correct parts to add brakes to a trailer.

expert reply by:
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Jameson C

Question:

I got the measurement off the spindle of my axle. B is 1.73", C is 1.38", D is 1.063" so it looks like that will mean a 3500" Axle. So the brake drum assembly you recommended looks right to me, but that is only 1, not a set? 84546UC3-EZ Then these electric brakes would go with that, right? 23-468-469

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Expert Reply:

That is correct you do have a 3,500 lb axle so the hub/drum part # 84546UC3-EZ that you referenced would fit. This is sold individually so you would need to order a pair. The correct brake assemblies are then the # 23-468-469 as well. To add a 7-way to the trailer the easiest solution is the Epicord Junction Box 7-Way kit part # 277-000141.

expert reply by:
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Jameson C

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