They used to be incandescent, but more and more often now manufacturers are using LEDs.
How do you replace brake lights
If the vehicle is equipped with a trailer light plug, the wires for the brake lights and the turn signals have been connected together, which is common, as many trailers do not have separate lights for brakes and turn signals.
It depends on the vehicle but in general you would have one fuse for the signals and one fuse for the brake lights.
Brake lights and turn signals are on a separate circuit from the tail lights. Tail lights are on the same circuit with the dashboard lights. If the dashboard lights aren't working either, check the fuse. If they ARE working, check the headlight switch.
turn signal switch needs replaced!
Could be the brake light switch or fuse.
It has a flasher relay for the signals only.
i have tail lights but do not have brake lights nor do i have turn signals. i have replaced brake switch and all bulbs
Most likely a fuse or a bad ground.
change the fuse if not replace flasher
There is essentially no restriction on using brake lights and turn signals at the same time, as they both signal actions/intentions that are often used in conjunction with one another. The brake light signals that you are using your brakes and slowing down, and the turn signal shows your intention to turn. As you will usually slow down as you come up to a turn, there will be many situations where both signals will be on at the same time.
Fuse, wiring, bulbs