Sounds like the brake light switch might be shorting out. Try unplugging
it, then putting in new fuses, then stepping on the brake while in the
driveway not moving. If it doesn't pop the fuse, hook the switch back up
and step on the pedal again. If it pops the fuse you'll know the switch is
either the whole problem or at least part of it.
Is there any crud in the bulb sockets that might let both elements light at
the same time? I'd recommend taking a test light to see if both positive
contacts at the bottom of the socket go live when you hit the brake pedel.
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