On my present trailer, about 2 or 3 years ago, I had serviced the brakes and installed new shoes and magnets. I was about 3,000 into a trip and when backing into a site, brakes made a terrible screeching noise. It was coming from the left side, so I jacked up each wheel and turned it to see which one it was. I think it was the front wheel, so I pulled the drum. What I found was the clip that holds the shoe spring in place had come off and the pin that came in form the back was gone. Front shoe was loose and all the adjuster parts was laying in the bottom of the drum and grinding away. I was able to salvage the parts and with use of a coat hanger to replace pin, got brake shoe back in place and drove about another 2000 miles home that way, as could not find correct part while on the road.
Okay, thank you all. I thought the problem might be specific enough to get a better idea of is going on with that wheel, but it sounds as though more than one issue could cause the problem. I'm at my destination CG in Key West for a month and I'll start pulling drums next week, starting with the one I think is the culprit.
--2005 Ford F350 Lariat Crewcab 6.0, 4x4, 3.73 rear
--2016 Montana 3711FL, 40'
--2014 Wildcat 327CK, 38' SOLD
The clips that hold the magnets in place will just about always disintegrate.
They are only there to hold the magnet in place while putting the drum back on.
As for the problem that the OP is having,I would suggest switching the magnet with one from a different wheel.If the problem moves,you have the answer.
The extra heat on a magnet from braking can cause strange things to happen.
I had one that locked up completly,had to cut the wire to the magnet and go on with 3 wheel brakes till I was able to get the magnet replaced.
'04 33.5 CKQG Hitchhiker Discover America
04.5 Dodge 3500 CTD SRW
Pac Brake,Max Brake
Fulltimers since '06