check the fuses
The brake light switch is out of alligment. Check on the brake pedal arm and readjust the switch.
Check bulbs - they are double filamented smaller is for turn and brake lights
Brake light switch failure, bad ground wire at rear of vehicle or fuze blown.
Often this type of behavior is caused by a bad ground for the lighting circuit. Check the ground circuit for the brake lights.
Switch is defective or out of adjustment.
Brake bulbs. You might need to replace them. It just happened to mine and it was tricky to do it. To take the brake lights you need to pull them from the sides, there is a small piece that would come out easily and then you can just take the screws out.
My 1991 Ford Mustang was 15.4 U.S. gallons , I assume the 1992 would be the same
Check the bulbs, Check the fuse, Check the brake light switch, in that order.
Check wiring for 12v also the brake switch on the brake pedal.
Check for a blown brake light fuse ( in the fuse panel ) or the brake light switch at the brake pedal could be the problem. The brake light switch releases the shifter lock as well as operating the brake lights.
which fuse triggers 1992 ford aerostar
mmmm... still thinking about it