bleeding trailer brakes?

[LKJR]

trailer under my boat has one of those force fed brake systems. Don't really know what it's called but it activates the brakes by the weight of the trailer.

anyway unscrewed the cap yesterday and the fluid looks like liquid rust. Do I ignore this to scrap this system in favor of electric brakes later. or can I gravity bleed these out? drain it and flush it somehow?

 

[kennyw]

gravity bleeding would probably work but I would be worried about the condition of the brake lines in a hard stop. Low points will rust out first too. The hydraulic system on a boat trailer might be better than electric brakes when submerged though /forums/images/graemlins/thinking.gif