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Should Trailer Brakes Hum While the Breakaway Pin Is Pulled  

Question:

When the brake away switch is pulled for testing should you hear a click or a humming noise coming from the brakes.

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Expert Reply:

Yes, when the pin on a breakaway system like the Hopkins Engager Push-To-Test Trailer Breakaway Kit part # 20099 is pulled that then sends full 12 volt power to the trailer brakes. When power is sent to an electric braking assembly you may very well hear sort of a humming noise and this is not uncommon at all nor it is an indication that a problem is present.

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Conner L

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