Parts Needed To Convert To Electric Brakes On 2004 Bri Mar Dump Trailer

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Question:

I have a 2004 bri mar dump trailer with surge breaks and 10 inch drums with 5 on 4.5 bolt pattern wheels. I want to convert to electric brakes. What electric backing plates would I need..?

asked by: Robert C

0

Expert Reply:

Hey Robert! If your trailer has 10" brake drums with a 5 on 4-1/2 bolt pattern, there's a good chance you have 3,500 lb axles. I can't say for sure based on the trailer year and model alone, so you will need to confirm this.

If they are 3,500 lb axles with a standard 4-bolt brake mounting flange, you can use the etrailer etrailer Electric Trailer Brakes # AKEBRK-35-SA along with # BRKH10B for replacement hardware. You will also need to add a 7-way using # e99011 and then some 10 gauge wire # 10-1-1 to run back to the brake assemblies.

Do you already have a brake controller on your vehicle?

expert reply by: Robin H

0

etrailer Electric Trailer Brakes
(click to enlarge)

Seadog

8/7/2026

Robert Good idea to upgrade the brakes on your dump trailer. Myself I went with the brake kit which included all the required hardware required at the wheel. I made the mistake of trying to go cheap with knockoff china junk at first with really crappy results just trying to save a couple of nickles. US made brake kits from like Dexter in my estimation are the only way to go and cheap insurance. With that said you might talk to your insurance company and see if they won't give you a break on the premium for the DT. Bottom line I'm very pleased with the performance of my electric brake conversion both in stopping and the peace of mind know I can stop the trailer. good luck SeaDog

Robin H.

8/7/2026

@Seadog thanks for sharing your experience! Glad to hear your electric brake conversion has worked out so well. That extra control and peace of mind is definitely a big benefit, especially with a loaded dump trailer. The Dexter Nev-R-Adjust Electric Trailer Brakes # 23-468-469 are a really great option assuming Robert has 3,500 lb axles with the standard 4-bolt brake mounting flange. They're made in the USA and come with the mounting hardware as well.

Answer 1

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 2

The #84 spindle is just a common way to identify the spindle dimensions typically used for 3,500 lb axles. So instead of listing out the parts, people can just say they have #84 spindles and it's easier to know what fits it. The CE Smith Trailer…

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Answer 3

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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Answer 4

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 5

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 6

That's a very good question, we tend to be extra cautious and say to use 10 gauge wire because that would be more than enough. When you get into longer trailers that will end up using a lot of wire the heavier gauge wire becomes more necessary.…

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Answer 7

Trailer wheel bearings are specific to the spindle that is installed on the axle that is on your trailer. You will need to safely support the trailer, remove the wheel and tire, remove the grease cap, remove the cotter pin and washer that secures the…

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Answer 8

Hey Robert, yes the Kodiak disc brake calipers part #KDBC225DAC that you referenced will replace the Tie Down calipers you have now 46304, they can be used as a left or right hand caliper and does come with ceramic brake pads. If you ever needed…

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Answer 9

Hey Robert! If your trailer has 10" brake drums with a 5 on 4-1/2 bolt pattern, there's a good chance you have 3,500 lb axles. I can't say for sure based on the trailer year and model alone, so you will need to confirm this. If they are…

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Answer 10

I currently have four different self-adjusting assemblies for your boat trailer with 10" x 2-1/4" electric drum brakes. You can choose from the following: -Terran Axle Electric Trailer Brakes #TX97ZJ (3,500 Axles) -etrailer Electric Trailer…

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Answer 11

Hi Rusty; the Dexter #84546UC3-EZ and etrailer #AKHD-5475-35-K will both fit a 3,500 lb axle but they have different bolt patterns. You already ordered the Dexter in the past so I'm assuming your wheels are 5 on 4-1/2. For the same bolt pattern…

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Parts Needed To Convert To Electric Brakes On 2004 Bri Mar Dump Trailer

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