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Hi I'm Wayne
I will try to help you with this
what are we working on, year,make,model
air or hydraulic
I am not familiar with that model
or ele brakes ,
I will opt out and put back to the board
Are the jerking or just locking up when you brake? Make and model of your brake controller?
If they are erratic or locking up on a new trailer the most probable cause is that they are out of adjustment. Correct PDI service would have caught that. It might be a controller that is out of adjustment as well. Get back to me with that make and model and I can offer more here. All follow ups are included in our fee.
Just checking back in to see if you were able to resolve this or do you still need more input from me here?