You have two separate relays for 4 ways and blinkers. I would say that the turn signal relay needs replaced. It is usally a round silver relay either on the fuse panel or under dash. Go to the parts...
try your high beam switch...
Neither the high beams nor the headlights, or their switches have anything to do with the brake lights which are on a totally different circuit.There could be one...
sounds like bad break light switch. your break pedal has a switch that turns on your break lights when you press on your breaks and off when you take your foot off the pedal.