Since the break lights turn on when the head lights are activated, the problem is probably in the wiring of your break lights. Someone may have accidentally disconnected the wires of your break lights to your head lights.
I would replace the headlight switch as Ford has had their share of these problems.
If you turn up your interior dashboard light settings, then the radio display will be brighter too. The radio dims to the setting for the dashboard when the lights are turned on.
The parking lights are turned on when the headlights are on and you pull out on the light switch. The parking lights cannot be turned on by themselves.
The middle two lights should be on when you turn on the headlights.
Break lights come on when you step on the break, they do not come on when the head lights are turned on.
Because you have to eat french fries with ketchup!
the dash and radio lights are supposed to dim when the headlights come on. Make sure you have the brightness of the dash lights turned up as much as possible.
Perhaps you turned on the interior lights when you were adjusting the headlights?
Brake lights should NOT be effected by the headlights. Brake light function is completely independent of the headlights. Assuming you are not refering to the tail lights, or marker lights, which are supposed to come when the head lights are turned on. Not having brake lights when the head lights are on is a big safety problem and should be corrected.
It may be wired wrong.
First thing you want to check is the dimmer switch to see if it is turned all the way down.
is there anyone who knows the answer?