Have you broken the "glazed" surface of the drums? A fine-grit sandpaper
should break up any glazing on the drum surface, which may or may not be
your problem.


"JohnC" wrote in message
...
I have a boat trailer with hydraulic brakes that keep chattering.
Upon disassembly and inspection the brake shoes are slick with black
stuff. After cleaning them down with alcohol and sanding them ( the
shoes) things are fine for a while, but then it starts again after
several more trips.
I dunk the trailer in salt water regularly. It does not appear that
grease is getting into the drum area from the bearing ( doesn't look
like it anyway.)
Any suggestions on whats causing this or how to prevent this problem?
Thanks,
John C.