| GMC trailer [message #354416] |
Sun, 03 May 2020 15:12  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
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I'm fixing a dual axle trailer for my GMC, and to haul at least 23' GMCs. It has electric brakes, of a type I've never seen - my experience with trailer brakes being very limited. Attached are two photos, one of the drum which has three metal plates attached to it. They aren't electrically isolated. The other is of the backing plate. In the center is a honkin' big electromagnet which you feed twelve wolts to activate. Around it are/is the brake shoe. It's a single piece with two shoes riveted on, Obviously it expands against the inside of the drum, sliding on the greased clips, and is rethracted bu the two springs at the top. The shoe is apparently the only moving part other than the roatating drum with the wheel attaced to the other side like any drum brake. My aqquestion is, how the hell does thios setup work? The magnet which is actually cup shaped has a break in the steel in the back - a gap all the way around concentric to the housing i.e. the housing is in two piences. The front of it, which you see, is a mostly sand and epoxy potting compound.
Obviously the brake expands and stops the wheel, but why/how? AQnd since the forum isn't currently letting me upload I'll put the pics on the photo site as trailer brakes.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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