Posted by Michael Soldan on April 08, 2009 at 15:50:44 from (24.235.56.69):
In Reply to: Trailer brakes posted by 37 chief on April 08, 2009 at 14:37:05:
Stan, when the magnet is activated against the surface face of the drum it should pull an activating lever back which expands the shoes at the top of the backing plate causing them to rub against the drum. The magnet does not do the braking, it causes the lever to pull back activating the brake shoes against the drum. There are three ways to tell if electric brakes are working. When applied you can hear a buzz sound coming from the wheel when parked. The surface face of the drum is shiny it indicates the magnet is activating against it and if the drum area is shiny it indicates the shoes are being pulled out against it. Any two of those conditions would indicate the brakes are working. If the magnet is a burnt bluish colour there is a problem. If you touch your test light to the magnet wires(surface wire of the magnet) and it lights there is a problem. Electric brakes aren't that difficult its just that they don't work half the time for the simplest of reasons..poor ground, rusty, adjusters need freeing up and set,bad magnet, moving parts need lube..you need to stay on them to keep themworking
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