Parts Needed to Add Electric Brakes to a Trailer w/out Brakes  

Question:

Expert Reply:

Hey Tommy to add electric brakes to your Coleman Popup camper, you will need to change the 4-way connector on the trailer to a 7-way connector using item # H20044 and add the junction box item # 38656 to make all the connections. This junction box puts all your wiring in a secure location.

You'll have to run item # 10-1-1 wire from the junction box to each electric brake assembly using heat shrink butt connectors item # DW05745-5 for a weather tight connection. The item # 10-1-1 wire is sold by the foot.

As far as wiring goes the last thing you're going to need is a break away kit item # 20400, which will engage the electric brakes should your trailer ever become disconnected from your tow vehicle.

For brake assemblies, I recommend the etrailer Electric Trailer Brakes - 10" item # AKEBRK-35, you were looking at, and item # BRKH10B to attach them to your brake flanges. This fit a 4-bolt mounting flange like item # 4-34 for a 1-3/4" round axles or item # 4-35 for 2-3/8" axles. I do not know the diameter of your axle so if you do not have brake flanges you will need to measure it.

The last part you'll need are a set braking hubs and I am going to need some information from you to get you the correct ones. I do not have a database I can look up that shows me this information like you can find on cars and trucks. What you'll want to do is pull one of the hubs and look at the two bearings. They should have numbers stamped into the sides of them. I'll need those part numbers to identify your spindle size which will tell me what hub you need.

If they do not have numbers stamped into the side you'll need to measure your spindles using a digital caliper like item # PTW80157. I'll need the C and D dimensions shown in the diagram below.

Additionally, I am also going to need to know your lug nut pattern so you do not have to change wheels. I have linked an FAQ below that'll show you how to measure them.

If you could provide me this information in the comment box below I'll be happy to find you the hubs you need.

expert reply by: Jerred H

0

Measuring Spindle
(click to enlarge)

Jerred H.

10/22/2025

Hey Tommy, were you able to get the bearing numbers or spindle measurements for your Coleman Popup camper? Once you have that info, I can help you find the right braking hubs. Let me know what you find—I’m here if you need a hand narrowing it down.

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