Trailer brakes are similar to the old car drum brakes, just electric and not hydraulic. As for maintenance, check them once a year, adjust, clean and repack wheel bearings at the same time. The best other thing to do, is camp a lot. Things rust up and quit working from non use, more so than from use. Probably more roadside trouble with trailer tires than anything else. I wouldn't worry about brake failure too much, but since you heard a noise, I would spin each wheel before the next trip. Could have been a rock, but better safe than sorry.
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LadyWindrider
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT
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