4 way flasher switch on top of the steering colum is what I have found better known as the turn signal, wiper, cruise control.
Possible ground issue at the taillights.
Bad socket? Bad ground? Problem in steering column switch?
It depends on the vehicle but in general you would have one fuse for the signals and one fuse for the brake lights.
if you recenly replaced bulbs u may have installed them backwards they should be running lights and brake lights if this is the case they maybe installed incorrectly
change the fuse if not replace flasher
i found it to be the tail light harnesses go bad . a common problem with them because the bulb sockets short out.
It may be wired wrong.
Check the bulbs - they are doubloe filamented with the smaller being for brake/turn signals Check the fuses
if turn signals are working , and brake lights not working, i would replace the stop light switch on the brake pedal
It sounds like a blown fuse or a bad head light switch
have you checked your fuses?
I would check the rear bulbs. I just had this issue and it ended up my brother had used the wrong bulb, and odd enough it caused the brake lights to stay on with headlights. When headlights were not on and you applied the brakes the dash would light and brake lights worked. Strange, HUH? I must admit before this revelation, I replaced headlight switch and brake switch, with no avail.