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To update this old thread, there is now a version of this actuator set for drum brakes, so it make it work even better. http://www.amazon.com/gp/product/B001MUGJK2/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B001MUGJK2&linkCode=as2&tag=oldgrossurstu-20&linkId=IFGG6DLIVZLEJQ6H

They are drum, but this still works fine. They label it disc because outside the military market you don't see many trailers with hydraulic drum brakes anymore. A friend of mine used one of those units on a 105 he converted to a dump and it works wonders. Granted after that and making it dump...

Easiest way is to replace the hydrovac with an electric over hydraulic actualtor like this one: BrakeRite Electric / Hydraulic Disc Actuator 4813100 by Titan That will use the stock brake parts, and it just activates them with electricty instead of air.