Originally Posted by DazC

Are you sure it head lamps and not side lights? This is reasonably common and is caused by the stop and tail lamp bulbs. Basically the fillament breaks on the buld and touches the tail lamp filament or brake lamp filamant which means that when you press the brake, a back feed travels back down the wiring and puts on the dash lights and front side lights.

2 new stop and tail lamp bulbs should cure it.