buzzing sounds come from breaks

[bobthecat]

I have a electronic buzzing sound come from breaks what does this mean?

[Stan]

I have heard that before when I pull the emergency "pin" from the small box in the front of the rig to test the emergency brake voltage. I suspect either your emergency box is bad or you have a short somewhere that is allowing voltage into the brake wiring. Try unplugging the umbilical cord to the tow vehicle to isolate the cause - it may be a bad brake controller in the vehicle as well. I don't think it is a buzzing as much as a humming noise.

[travelin texans]

Somehow/somewhere you're get to,g vtage to the magnets that activate your brakes, either bad connection, bad controller, or bad magnet.

[harley]

Make sure the pin on the end of your emerg braking cable (that you hook to the truck bumper) is properly plugged in.

[rcflyer]

If you are talking about a buzzing sound only when the TV brakes are applied and you have a Prodigy controller the sound is probably normal.

When the Prodigy applies low level braking this is done by a pulse width output at a frequency that is in the audible range.

I have noticed this from many trailers going through campgrounds when the driver is riding the TV brakes which with a Prodigy applies about 25 percent braking effort if the TV brakes have been applied for more than 5 seconds.

This is what Prodigy calls the HOLD value and is used to hold the trailer when stopped and the TV brakes are applied.