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How To Determine Replacement Hubs And Brakes For Boat Trailer

Question:

I need to replace the full brake system on my boat trailer. The 2 questions I have is how to best know what I need for brakes. Currently they are on 1 axle. I believe they are 12 inch by 2 inch but not sure yet. The total weight is close to 9,000 lbs. Also, to ensure I get the right hub, I believe I need to get a bearing number. Is this correct and if so, do you just need one such as the outside one as it is the easiest to remove? Thank you.

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Expert Reply:

Unfortunately, just the outer bearing is not quite enough to figure out what you need for replacement hubs and bearings. For a trailer with that much weight it sounds like you have a tandem trailer. I recommend replacing the bearings and seals on all of the wheels at the same time, even if you are only replacing the brakes on one axle.

If you remove the inner and outer bearing and can find the numbers, that will really help. Or you can use digital calipers like part # PTW80157 and take some measurements on the spindle as noted in the attached photo.

If you are looking for hubs, drums, and all the brake components let me know what kind of brakes you currently have and what the wheel lug bolt pattern is and I will be glad to make some recommendations that will work for you. You will also need to know the brake flange configuration as those can vary as well.

I have attached links to a couple helpful articles you can check out.

click to enlarge
expert reply by:
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Jeffrey L

Question:

Sorry it has been awhile since I have gotten back to you. Regarding the information you requested, the brake flange pattern is the 5 bolt pattern. Do you need a picture or is there only one pattern? The bearing numbers are 15123 and 25580. The bolt pattern is a 6 bolt pattern for the wheels and it is a tandem axle, currently with drums only on the front axle. Does this help you with what I need to replace the entire brake setup? Thank yo

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Expert Reply:

The hub and drum assembly I recommend for your tandem boat trailer is part # AKHD-655-6-K.

This assembly is rated for 5,200 to 6,000-lb axles and includes the inner and outer bearings, seal, races, lug nuts, and grease cap. This has a 6 on 5-1/2 wheel bolt pattern and works with a 12-inch brake assembly.

The brakes I recommend for your trailer is part # AKUBRK-7R for the right hand and part # AKUBRK-7L for the left hand.

If you are planning on replacing the brake lines as well, and plan to continue to use brakes on one axle only I recommend part # 18SI-BLKIT. The brake line kit for a tandem trailer is part # 20TA-BLKIT.

click to enlarge
expert reply by:
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Jeffrey L

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