[urq] Brake Lights

[Bob]

I just noticed something on my 85.
My brake lights work fine on the car, that is until I have the parking 
lights on. When I have the parking lights on, the bottom 2 bulbs light 
up, which should be my brake lights. And when I hit the brakes, they 
dont change.  A long time ago I changed to the dual element bulb 
holders, but never put in dual element bulbs, I thought that was it, so 
I put the OE holders in again, and it still does it. What am I missing?
bob