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Parts Needed to Convert From Hydraulic Drum to Electric Over Hydraulic on 2005 GMC Sierra 2500  

Updated 05/31/2022 | Published 05/28/2022



Question:

I have a small all purpose trailer with surge brake drum set up. I pull trailer with 2005 GMC 2500HD. I would like to convert to EOH for drum brakes. Which controller set up is needed? Thanks

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Expert Reply:

We can get you everything you need to go from hydraulic drum brakes to an electric over hydraulic set up for your trailer and 2005 GMC Sierra 2500. You'll need an EOH actuator, breakaway kit, and brake controller that is compatible with an EOH set up. First, for the actuator and breakaway kit you'll need the following:

- Dexter DX Series Electric Over Hydraulic Brake Actuator for Drum Brakes # K71-650

- Bright Way Push-to-Test Trailer Breakaway Kit # 3802311

Then for the brake controller & harness for your '05 Sierra that is compatible with an EOH set up, and a good option is from Curt:

- Curt TriFlex NEXT Trailer Brake Controller w/ Custom Harness # C86SV

This is both the controller and the harness for your Sierra, and if your truck has the factory 7-way, you're all set up and don't need anything else for the brake controller. But if you don't have the 7-way, you'll need one of two harness. If you have no connector at all, there will be loose wires above the spare, and you would need to hardwire in the Pollak 7-Pole, RV-Style Trailer Connector Socket w/ Wiring Harness # PK11898.

Or, if your truck has a round plug with a cap instead of a bundle of wires above the spare tire, use part # 30955.

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Kyle S
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