Parts Needed To Add Electric Drum Brakes To A U-Haul Tow Dolly

Question

Question:

I bought a used tow dolly from u-haul and I want to add electric brakes to it. Can you advise me on which kit I would need?

asked by: Lee G

0

Expert Reply:

Hi Lee,

To add brakes to your tow dolly you'll first need to see if there's a brake flange welded to the axle for the brake assemblies to mount to. If not then you'll be replacing the entire axle with one that has a mounting flange. From there you'll need to know your bearing and grease seal sizes so that we can find the correct hub/drum kit to fit the spindle and bolt pattern of the wheels.

Next you'll need to install a 7-pole trailer harness, breakaway battery, breakaway switch, and a junction box. You'll have to run 10AWG wires from the junction box to the brake assemblies and will also need to install a brake controller in your tow vehicle.

This is going to be quite a bit of work and require quite a few parts. If you're still interested then let me know what your bearing/grease seal combination is and the bolt pattern for the wheels and I can start looking for all the parts you'll need.

expert reply by: Kevin C

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Answer 1

You have a 3500 pound axle, with a 4-bolt axle flange, spaced 4” apart each. You also have tires and wheels with a 5 on 4.5 bolt pattern. To put brakes on your West Texas Dolly #WTD-35D you will need a left and right trailer brake kit like the…

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Answer 2

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Answer 3

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Answer 4

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 5

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Answer 6

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 7

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Answer 8

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Answer 9

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Answer 10

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 11

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 12

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Parts Needed To Add Electric Drum Brakes To A U-Haul Tow Dolly

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