Sometimes you will hear a hum, but not always. Like the good dr. said, the
best way is to spin the wheel.
Pete
-----Original Message-----
> All,
>
> When energizing the yellow brake wire with 12volts and a proper
ground,
> should I hear anything coming coming from the wheels? I am doing this
with
> my 1969 Caravel at rest using a 12 power supply and although I get a
> predictably slight spark when clamping on to the yellow wire, I don9t hear
> anything from the wheels. Or do I need to remove the hubs to observe any
> movement when they are energized?
>
> TIA,
>
> Glyn Judson
> 1969 Caravel #508
> Santa Monica, CA 90403
>
The magnets pull towards the disk that is part of the drum/hub
magnetically and the drag on that disk then pulls on the brake shoe
actuating arm as the wheels rotate. You won't see or hear anything with
the drum/hub assembly off. Try jacking up the wheel and giving it a spin
then apply 12 volts. It should stop abruptly.
Or with the wheel jacked up, apply 12 volts to the brake and turn the
wheel forward. It should turn a little and then drag or lock. 12 volts
should be enough to lock the brakes hard.