For starters, I am going to assume that you have electric drum brakes. The issue you described of the brakes locking up could be caused by several different things. In order to save yourself some time, I recommend hooking up the trailer to a different tow vehicle or the tow vehicle to a different trailer. This will then allow you to pinpoint which side the issue is occuring on.
When you said that you disconnected the trailer from the tow vehicle did you check to see if the brakes released?... view full answer...
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