Brake lights should NOT be effected by the headlights. Brake light function is completely independent of the headlights. Assuming you are not refering to the tail lights, or marker lights, which are supposed to come when the head lights are turned on. Not having brake lights when the head lights are on is a big safety problem and should be corrected.
Driving with no brake lights can be very dangerous. If it is dark outside, a car behind you, may not see you. Having no brake lights will not alert any cars that you are slowing down or stopping.
You do not need the key in the ignition to make lights work. They are "hot" all the time. The reason you Sid marker lights are coming on at the same time is because you have a bad ground in one of your brake lights. It's allowing electricity to jump from the brake lights to the tail light circuit. Take the brake lights apart, clean up all the rust and make sure they "ground" to bare metal. Problem cured.
By "exterior" lights I am forced to assume that your mean the tail lights, brake lights, license plate lights, and if available, the side marker and clearance lamps. When a trailer light wiring harness is attached to a towing vehicle's electrical system, it is generally tied into the tail/brake/license light wiring harness. If that is the case with your setup, then the same fuses that serve the vehicles light system[s] also serves the towed vehicles lights. Usually, one fuse serves the brake lights, and another serves the tail, license, side marker, and clearance lights.
Most Likely the problem with the brake lights would be the switch located in front of the brake pedal arm just below the pivot point. It has a spring inside so that when the pedal is depressed it makes contact internally.
Because something's wrong, of course. What it could be... bad switch, break/short in the wiring, bad fuse or relay, or even just bad bulbs.. chances are, your car uses dual filament bulbs for the brake lights, where they'll function as both marker lights (with one filament active) and brake lights (with both filaments energized).
Yes, it has brake lights.
your light wires have been crossed somewhere ( probably at the tail lights, brake light circuit crossed with marker lights ) look for recent wiring work on the lights and make sure the proper wires match up.
ck all outside lights, brake,tail, turn and cyclopse(middle brake lite)
Yes they indeed have brake lights...
Very top is ABS, next two down are marker lights, next two down from that are flashers/turn signals, bottom is brake lights, center is ground.
Then the brake lights are out but the middle one still lights up. (:
The marker lights and brake lights run on two different circuits, and usually light up two different filaments on the bulb. If both tail lights are out, either a fuse is blown, a wire is compromised, or both marker light filaments on the bulbs are broken.
check the fuse, brake lights have their own, & check the brake switch at the top of the brake pedal
are you sure it is the brake lights and not the tail lights. if it is the brake lights you most likely have a short some where. go to a auto eletrican It is the brake lights which turn on. Short in the switch or the wiring?
on the brake pedal under the dash is a brake light switch. that when you depress the brake it turns your lights on. you might wanna check that
No , the rear brake lights do not turn on when you use your parking brake , just the brake light on your dash is supposed to come on
they are not brake lights they are fog lights and they turn on because it is for the car behind to see you
I'm not a mechanic / technician but if all ( 3 ) brake lights don't work ( assuming you have a 3rd higher mount brake light and all the bulbs and fuses are fine ) then it would be a problem with your brake light switch ( and also I BELIEVE if all the outside brake lights stay on )
The brake light, a red light shaped like a headlight on the dash means that one or more exterior lights are not working. It could be a taillight, brake light, side marker, license plate light, or third brake light. It stays on all the time if it's a side marker or any light besides the brake light. If it's the brake or third brake light it will come on only when you press the brake pedal.
the brake lights are on a separate cuircut,if your brake lights are staying then it will be a fault with the brake light switch. the switch is located under dash,and will be on or very close to brake pedal.
The brake lights and the tail lights are separate circuits. Check the brake light fuse, then check the brake light bulbs, then check the brake light switch.
Check the switch on the brake pedal
Brake lights draw their energy from the vehicle's battery.
Brake lights are on continuously while you are driving. Every time the brake pedal is depressed.