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Thanks. I suppose the wheel cylinders could have been dried out this way.

The technician who did the brake flush was former military and recognized the trailer right away. The ideas above were mine (inexperienced with DOT 5 brake systems), but I am sure the person who worked on it fixed it the right way using his experience and the TM.

I decided to have a shop drain the system and then blow compressed air through the lines to completely clear them out. Then they will add fresh DOT 5. That stuff is expensive but it is better than losing your trailer’s brakes coming down the Appalachians next month.

Thank you NDT and gringeltaube for your quick responses. It looks like the lowest point on the brake line is below the level of the wheel cylinder, so I agree that if water made it down that far, simply bleeding the brakes may not get it out. I might need a power bleeder, which means a...

I recently had my M116A3 trailer inspected (PA requires this every year), and it passed. I then took the trailer on a 600 mile trip the next day, half of which was in a severe rain storm. Today while walking by the trailer, I noticed the master cylinder appeared “wet” with silicone based DOT 5...