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This Four Winns trailer uses a typical surge-brake coupler that pushes more fluid to the brakes based on how much it's "squeezed" between truck and trailer during braking. It's self-contained but must be kept lubricated and full of fluid for best operation.
Trailer Brake Basics

 This Four Winns trailer uses a typical surge-brake coupler that pushes more fluid to the brakes based on how much it's "squeezed" between truck and trailer during braking. It's self-contained but must be kept lubricated and full of fluid for best operation.  Related Article

 

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