Electric Over Hydraulic Actuator and Parts to Add Disc Brakes to Third Trailer Axle

Question

Question:

I have a triple axle aluminum boat trailer. My boat is approx 8,000lb with no gear or fuel. I want to convert to electric over hydraulic. What parts do I need? What is the best electric actuator availible? BTW..Only two of the axles have disc brake. The calipers are Kodiak 225. I need to get brakes on the third set of axles. Thanks,

asked by: Ira S

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Expert Reply:

Sounds like you have a surge brake coupler on your trailer currently and are looking for a way to convert it to an electric over hydraulic setup and then also add brakes to your third axle.

The electric over hydraulic actuator I like the best is the Cargo Towing Solutions HydraStar Electric-Hydraulic Actuator for Disc Brakes # HBA16. This actuator has proven to be very reliable and rarely has problems.

The Kodiak 225 caliper that you have on your other axles is a very common caliper that is used on brake axles that are from 3,500 lb to 6,000 lb in capacity. First let's figure out the brake line components needed to add the third axle.

You are going to need 2 of the Tee part # T0778500, 2 of the retaining clips # T0936600, 2 of the # T1062200, 2 of the brackets # T0776300, 2 of the clips # T0776400, and 2 of the hoses # T0776500. See the attached pic to see how all of the components go together.

Now to pick out a disc brake kit you are going to need to know the weight capacity of the axles you have and the bolt pattern of the wheels you have. The axle capacity will be listed on the plate up near the coupler of the trailer. I attached an FAQ on determining bolt patterns for you to check out as well. Let's say you have 3,500 lb axles and have a 5 on 4-1/2 inch bolt pattern. You would want the # K2R35D. This kit uses slip on rotors that will fit on you idler hubs.

expert reply by: Jameson C

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Answer 1

The Kodiak Hydraulic Brake Line Kit part #18SI-BLKIT doesn't come with hardware for the liner holders. The reason for this is that the exact hardware you need will vary by application and preference. In most cases, self-tapping screws will be…

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Answer 2

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 3

To determine the size of the brake assemblies you need you have to measure the depth and width of the hub drum on the axle like what you see in the picture I attached. The most common size is 2-1/4 inch wide like the #T4071600-500 that you…

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Answer 4

To determine the size of the hub assembly you need to purchase you have to determine which bearings are in the old assembly. If the old assembly has L44649 inner bearings, you would use the hub you chose #8-258-5UC1. If the inner bearings are marked…

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Answer 5

A BT8 spindle would have a diameter of .99 of an inch where the bearings would both install and would have a diameter of 1.24 where the great seal would ride. That would require a hub part #AKIHUB-440-2-1K for an idler hub. A BTR spindle would have…

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Answer 6

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Answer 7

To find the load capacity for your axle you should look on the trailer VIN plate or sticker that lists the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that…

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Answer 8

You will need to measure the diameter of the spindles where the seal and bearings ride. Check out the picture I attached that shows where this is. You will need an exact measurement so either a digital or dial caliper will be needed. To pick out the…

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Answer 9

Torque specs for wheel lug nuts will vary depending on the diameter of the lugs, type of lug nut and the wheel's material. The linked chart details the recommended torque for many combinations. Dexter Hub/Drum #84546UC3 has 1/2-inch studs and…

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Answer 10

There really isn't a particular maximum trailer weight that is used to determine when brakes need to be added to both axles of a tandem axle setup. While I do still recommend checking your local laws, I am also not aware of any general laws that…

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Answer 11

Depending on how the trailer was made, there will be a few spots you can check to identify the axle. First, if the trailer was pre-made by a specific company, you may be able to find this information in either the paperwork or on a placard somewhere…

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Answer 12

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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Electric Over Hydraulic Actuator and Parts to Add Disc Brakes to Third Trailer Axle

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