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Parts Needed to Convert Hydraulic Brakes to Electric Brakes on a Boat Trailer 3.5K Axles


My boat trailer has hydraulic brakes that are always locked up. I removed the brakes to at least be able to move the trailer. How do I change to electric only? Can I use the same brake hubs? Current hubs are Trailer Buddy Unique Functional product HD 1377. Inside dia. is 10in, outside dia. is 10 5/8in. 5 open thread holes for mounting tire with bolts, not lugs.


Expert Reply:

To change your boat from hydraulic brakes to electric brakes you will need to replace the hubs and brake assemblies. The UFP hubs that you have do not have a surface suitable for a brake magnet. You will also need to add wiring for the brakes and a breakaway battery.

Here is a list of parts I recommend for your trailer:

-3.5K Brake Assemblies # AKEBRK-35-SA
-3.5K Galvanized Hubs # AKHD-545-35-G-EZ-K
-3.5K Painted Hubs # AKHD-545-35-EZ-K (if you don't want to spend the extra money on galvanized)
-7-Way Upgrade Trailer Wiring Kit # e99011
-12 Gauge Wire # 12-2-1 (Sold by the foot. This will run from the junction box back to the brake assemblies)
-Heat Shrink Butt Connectors # DW05745-5
-Breakaway Battery Kit # 3802346

For your vehicle, you will need a 7-way trailer connector if you don't already have one and you will need a brake controller. If you'd like some guidance or recommendations on equipping your vehicle, please let me know what vehicle you have and whether or not it has a factory tow package.

I've attached a few help articles and videos for you to check out.

expert reply by:
John H

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