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Can Drums from a Trailer with 7 Inch Hydraulic Brakes be Used When Converting to Electric Brakes


I have 7 inch surge brakes on a pop up camper and want to change over to electric brakes. Question is: can I use the old brake drums. Thanks for the help.


Expert Reply:

You might be able to re-use the drums. Some 7 inch hydraulic drums are sized differently and will not allow electric brake assemblies to be properly positioned in the drum. Some times the hydraulic drums are too deep and will make contact with the brake backing plate before they are seated all the way on the spindle. The best way to proceed is to try re-using the drums first and if they do not fit get drums made for electric brakes or you can buy electric brake drums from the start.

We have one set of 7 inch electric brake assemblies available. They are 7 x 1-1/4 inch assemblies, probably a bit narrower than your hydraulic assemblies but that is fine. For the left side you would use part # 23-47 and for the right side you would use part # 23-48.

I have included a link to all of our 7 inch drums. Some drums specify that they are for hydraulic or electric so check the product description. If they do not specify then they will work with both.

I have included a link on installing and wiring electric trailer brakes that you may find helpful.

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