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What has happened is the switch on the brake peddle has moved. Reach under the dash and locate the switch and adjust it so the peddle is depressing the button.
Couple of questions....
when you step on the brakes pedal do the other brake lights work?
does the third brake light go out with the brake switch unplugged?
have you checked for trouble codes in the abs module?
The switch is on brake pedal,easy to remove,just unplug electrical connector and remove nut holding on,Here's a link to the part,just look how far the nut is on so you can get it adjusted to where the switch is right when installing new one.
the break light switch has a needle like rod that pushes up against a flat plastic bushing. The bushing has probably fallen out. Without the bushing the rod has nothing to push against. So, your brake light stays on. I replaced mine with a rubber press screw that fits perfectly in the small hole. Rubber press screws are generally used to secure rubber splash guards under vehicles. They push in and don't back out. Now reattach your break light switch and the rod will now have a bushing to push against.
Look under the dash, on the brake pedal arm. There are one or two switches that activate brake lights and/or shift unlock. Check for loose mounting nut or a missing rubber nubber. Is the brake pedal coming all the way back up? Look on the floor for something not usually found there. These switches are adjustable and it may be as simple as adjusting them. Have a helper look for brake lights on and shift lever unlocked while you push and release the switches with your finger. Depress the brake pedal to get it out of the way. Remember to set the park brake first. Could just be a bad switch or loose connector. Check fuses and the bulbs. Is shifter fully in Park? Also try jiggling the turn signal lever.
The power flow for the brake lights goes like this: Fuse ->Brake switch -> Turn signal switch -> Rear lights. The only difference is, if you have a 3rd brake light in your rear window, that gets its power directly from the brake switch. It does not go thru the signal switch first. So, if you are having a brake light problem, and your fuses are good, check the 3rd light in the rear window, if it lights up (assuming the bulbs are good, no one ever changes them), then the problem is most likely in the turn signal switch, hope this helps!
At the top of the brake pedal, there are 2 small hard plastic fittings that fit into 2 holes. When those plastic fittings get old, they get brittle and break and then fall out. Those plastic fittings are what push against the brake light sensor. So when they fall out, there is nothing that "trips" the brake light sensor. They cost 10 bucks at nissan. Try that first. Bet that does it. It did for me !!
Your brake switch should be above your brake pedal. For Nissan it will look like a silver cylinder about 3/8" wide. You can try adjusting it down so it better contact the brake pedal in it's up position. It is threaded with a locking nut. If adjustment doesn't work, go for replacement. Good luck and hope this helps.
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