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check the brake switch with a test light you should have power all the time on one wire and only power on the other wire when the pedal is pushed. if you don`t have power all the time check fuses, if you don`t have power on the other wire the switch is bad, if this is good then check the sockets at the rear to see if you have power and ground. if not then you have a wiring problem between the switch and the socket and you will have to find the break starting at the back of the socket and move towards the switch checking the wiring until you find the problem.
It could be the turn signal switch, since the brake wire travels through the turn switch after it leaves the brake switch and then goes to the bulbs. That is how you get a steady brake light on one side, and a blinking light on the turning side. The rear turn signal lights and brake lights share the same filament in the bulbs (and the same wire). The wire on the turning side has to first travel through the flasher relay. If you have a test light, first check for power out of the brake light switch with the pedal depressed. Then check for power in and power out at the turn switch connector-power in on the brake light wire and power out on either of the wires going to the rear bulbs-if no power out, the turn switch is bad-brake pedal still depressed so you still have the signal.
There is a brake light switch operated via the brake pedal. Once the switch wears out there is nothing to activate the brake lights. You will have to have the brake light switch replaced if a check of the vehicles wiring for the lighting is shown to be all in order.
either replace brake light switch or check on the brake pedal arm for a 1/2 diameter blue rubber brake light switch bumper pad. The brake switch is normally closed which means when you push the on brake pedal the switch makes and power is applied through the switch to the lights. When the brake pedal is released the switch actuator strikes the rubber bumper and opens the switch contacts. If the bumper is missing the switch will not open to break the power circuit to the lights.
You need to check the brake switch on the brake arm under the dash the arm is screwed in and gets loose over time, the switch is $15.00 dollars and is easy to replace, with the wires pulled off of the switch unscrew the switch counter clockwise till the switch comes out then replace it in reverse order screw in till the plunger pushes against the brake arm, when you press on the brake pedal the brake light should come on, this is assuming you have checked the brake switch fuse.