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The tow brake lights are on separate systems, so the high mount brake light can work fine and the lower brake lights not work. I would first check the brake light switch and connector at the brake pedal with a 12 volt test light, see if you have power coming into the switch on one wire and power going out when the brake pedal is depressed, if not the connector is bad or the switch.
It's probably a bad turn signal switch, since the brake lights are wired in with the turn switch.
If you have a 3rd brake light, the high mounted one in the rear window, this light is separate from the brake lights that go through the turn switch. If your high mount brake light comes on, when brakes are pressed, then brake switch is good and probably a bad turn signal switch. Of course if you have a voltmeter or test light, you could test for power in and power out from the turn switch connector, to help you find the problem.
Well first you go to the fuse box and find stop light see if it has blown if not go to the rear and remove the globe holder plug assy which has either double or single light bulb if double get test light and touch either wire and get someone to turn on the ign switch [on but not start] and also put foot on the brake pedal ,if the test light dont light test the other wire base ,if no light comes on then go to the stop light switch mostly on the brakeline connection box under the bonnet or it could have a brake switch in the cab above the brake pedal and that will have either a broken wire or switch unserviceable .
Have some one help you, start the car and have some one stannd behind it and watch the brake lights. step on the brake normally and see if the brake lights come on, if they do then see if it comes out of park, the most common problem is the brake light switch fails and it does not release shifter. if you step on the brake and the brake lights do not light up then switch is bad , then step on brake hard and see if lights come on if so then again brake switch is bad, the brake light switch when brake pedal is pushed sends power to brake lights and then sends power to shifter release to unlock shifter. good day.
Check for a bad fuse in the fuse panel under the dash and the brake light bulbs in the brake light housings for bad bulbs. Next check the brake light switch at the brake pedal to see if there is power going to it. With a voltmeter check the switch and if it is bad replace it. If the switch is good and has power to it, check the wiring from the switch to the brake light housing for a shorted wire
check for power at the wires going intop the tail lights, real common that the circuit board is bad, but unlikely both at the same time. The tag, tail lights and brakes are 2 different systems. Do the turn signals work normally? if so the wiring from the turn signal switch to the brake lights is GOOD. the stop light switch had\s a ORANGE wire that should have 12V if not ck STOP LPS fuse, when brake pedal is depressed, the WHITE wire is 12V (at the stop light switch) if that is OK, the turn signal switch COULD be bad. The wiring harness plug is near the back left under the tailgate, see if that is disconnected?
IF THE FUSES INSIDE THE CAR & UNDER THE HOOD HAVE ALL BEEN CHECKED WITH A GOOD FUSE TESTER, & THE BRAKE LIGHT SWITCH REPLACED, THE TURN SIGNAL SWITCH IS NEXT. THE BRAKE LIGHTS GO THROUGH THE TURN SIGNAL SWITCH SO THEY CAN BE USED AS TURN OR BRAKE LIGHTS. I'M ASSUMING THE BULBS ARE OK. REMOVE THE PLASTIC FROM AROUND THE TURN SIG. SWITCH. STAY AWAY FROM ANY WIRES THAT ARE IN THE YELLOW SLEEVE. THEY ARE AIR BAG WIRES. WITH BRAKE PEDAL DEPRESSED, THERE SHOULD BE POWER IN THE WHITE WIRE. IF THERE IS NO POWER IN THE WHITE WIRE, YOU MAY HAVE TO PUT A BYPASS WIRE FROM THE WHITE WIRE COMING OUT OF THE BRAKE LIGHT SWITCH TO THE WHITE WIRE GOING INTO THE TURN SIGNAL SWITCH. IF THAT DOESN'T MAKE THE BRAKE LIGHTS WORK, THE TURN SIGNAL SWITCH MUST BE BAD.
The brake lights (excluding the 3rd brake light) go through the turn signal switch. It's possible there's a bad connection in the switch causing your symptoms. I would rule out the brake switch on the pedal, considering the third brake light works. Locate a wiring diagram for the brake light circuit, follow the wires into the steering column as far as you can and verify it's getting power up until the turn signal switch and verify no power is coming out of it. Once that's determined it's time to replace the switch.
Did you check the brake light switch located on the brake pedal under the dash? You will need a test light and turn the key on and test the posts on the switch to see if you have power coming out of the switch.
get a test light, on the brake pedal itself is a two or four wire switch, check for power at the switch on one terminal, when you depress brake pedal voltage should transfer to a second terminal thus feeding power to the rear brake lights. check this and keep me posted.