How to Convert M105A2 Cargo Trailer from Air-Over-Hydraulic Brakes to EOH or Electric Drum Brakes  

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Expert Reply:

The M105A2 military trailers don't have standard axle sizes as they utilized a variety for their specific needs. If you have 10 inch, 12 inch, or 12-1/4 inch drums you can make a conversion to electric drum brakes. You will need to measure your hub diameter as well as you hub depth to find the correct fit. I've attached a link to you options to assist.

Then you will use # 10-1-1 wire sold by the foot and the Epicord 7-Way Molded Trailer Plug with Junction Box - 10' Long # 277-000141 with ring terminals like # 44-5310A. Then you can add the breakaway system and I recommend the Hopkins Engager Push-To-Test Trailer Breakaway Kit w/ Built-In Charger # 20099.

If you have drums that are larger, then you will need to stay with the hydraulic brake assemblies, but you can use the HydraStar Marine Electric Over Hydraulic Actuator w/ Breakaway and 7-Way RV Harness - 1,200 psi # HS381-9066 for the conversion.

expert reply by: Jason S

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