Brake lights stay on 2000 Chevrolet Silverado 1500

When the key is off no brake lights, when key is on all three brake lights stay on. I unplugged the plugs underneath the truck in the back that goes to the brake lights when they are unplugged the brake lights go off except the third brake light stays on
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
Hi there – I believe your brake light switch is either sticking or mis-adjusted, resulting in the brake lights remaining on after the brakes are used. Turning the ignition switch to the "Off" position removes power to that circuit, and the brake lights go out. I would recommend having your brake light switch replaced by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

How to Identify and Fix Common car Problems ?

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Bad Switch: One common reason for the Parking Brake light to stay on is a failing or failed switch. This can be checked easily by jiggling the handle after it is down. If the light turns off (or turns off and then back on), the switch is the most likely culprit and will need to be replaced.
The most common cause for brake lights not turning off is a stuck brake pedal. If the pedal doesn`t come back up all the way when you take your foot off, it will continue to apply some braking force and keep the lights on.
The most common cause your brake lights stay on is because of a faulty brake light switch or sensor. It can also be caused by a faulty brake pedal or a malfunction in the electrical system. If you recently replaced the rear light bulbs when it occurred, you may have installed the wrong light bulbs.
What does it mean if your brake warning light is on? Typically, your brake system warning light being on means your parking brake is engaged, but if you`re still seeing the red (or orange) warning on your dash while the parking brake is disengaged, you will need to get your brakes inspected as soon as possible.
The brake warning light could activate for various reasons such as an engaged parking brake, worn brake pads, malfunctions in the Anti-Lock Braking System, sensor failures, low brake fluid levels, or a rear brake light bulb fault.
When your brake light comes on, your car is letting you know that either your vehicle is low on brake fluid, the emergency brake is activated, there`s trouble within the ABS unit, or there`s a problem with the sensors.
When you notice that your 3rd brake light stays on even when your truck is turned off, it`s likely due to a faulty brake light switch. This switch is responsible for turning the brake lights off when the vehicle is turned off, so if it`s not working properly, the lights will stay on.
The most common brake light switch is the simple mechanical type mounted close to the brake pedal arm. When the pedal is depressed, the switch automatically closes to turn on the brake lights. The other type of switch works hydraulically and is operated by the pressure of fluid in the pipes when the brake is applied.
The brake light switch sensor lets the ABS module in your car know when you`ve applied the brakes and indicates that it`s time to start the ABS hydraulic pump. That`s why if your ABS warning light comes on, there`s a chance that your faulty brake light switch is the culprit.
When you notice that your 3rd brake light stays on even when your truck is turned off, it`s likely due to a faulty brake light switch. This switch is responsible for turning the brake lights off when the vehicle is turned off, so if it`s not working properly, the lights will stay on.
Blown Fuse or Broken Fuse Box

If your brake light switch works perfectly fine and yet the brake light doesn`t illuminate, you should check for a blown fuse or a broken fuse box. This is important because both these components affect the brake light circuit.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Brake lights stay on 2000 Chevrolet Silverado 1500
ANSWER : Hi there – I believe your brake light switch is either sticking or mis-adjusted, resulting in the brake lights remaining on after the brakes are used. Turning the ignition switch to the "Off" position removes power to that circuit, and the brake lights go out. I would recommend having your brake light switch replaced by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

When I put my foot on the brake my back left brake light goes off, when I take it off the brake the brake light comes on
ANSWER : I would suggest trying to disconnect and reconnect the wiring to the rear lights. I have seen these older Toyota vehicles rear lighting short out on the lights themselves due to the way the light circuit was made on the lamp housing. Look at the housing circuit on the light to see if one is touching another, and that could tell you why it is malfunctioning. There could also be a problem with the brake light switch. If you are not comfortable dealing with wires, I recommend getting in touch with a certified mechanic who can look at your brake light issue for you to see what’s going on.

EPC light on 2004 Jetta. Code said brake switch faulty, but brakes lights worked. Replaced brake switch, now no brake lights.
ANSWER : Hi there. The first thing that pops in my mind beyond of what you have listed is perhaps the electrical harness attached to the brake switch. Perhaps the harness itself is damaged or you have an exposed wire, loose ground wire somewhere. You might want to have a professional mobile mechanic come to your location and complete a brake lights not working inspection to help you diagnose this issue.

Brake lights are not working. replaced brake light swtch still no brake lights. the third brake light the connection was melted at
ANSWER : The first thing to do is to repair third brake light and replace the brake light fuse and then see if the third brake lights work and the lower lights start working? If only the 3rd brake light starts working then you may need a further checks on the turn signal flasher or switch could be bad.

No dash lights, back right tail light is out, no parking lights. Brake lights work though as does head lights.
ANSWER : Hi there. In many cases, when you have electrical problems like you’re describing, it’s caused by multiple electrical component failure. It’s likely that a few electrical relays are not working; especially if you have systems that utilize the same components (such as your brake light and tail lights). I would recommend having a professional mobile mechanic come to your location to complete an electrical problems inspection first, so they can pinpoint what is damaged and recommend the right repairs.

Brake sensor is to sensitive causing brakes to flicker while driving. 2005 Mercury Montego
ANSWER : Hi there – your brake light switch needs a minor adjustment. It is adjusted too "tight" or close to the brake pedal lever, or possibly has failed. Adjusting/replacing it will eliminate this flickering problem. I recommend a brake light isn’t working inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.

I have no brake lights and third brake light I have checked all fuses and brake pedal switch and the switch is fine and I’m still
ANSWER : Hi there. Well, you’ve listed most of the usual suspects including the brake switch, fuses and tail light assembly. However, one item you might want to also check is the accessory electrical relay. In some cases, the relay that supplies power from the brake switch to the tail light assembly will cause the issues you are describing. I always recommend that home mechanics purchase a service and repair manual for their vehicle to have a schematic accessibly, so it might benefit you to purchase one online to locate this relay or feel free to have one of our mobile mechanic some to your location and complete a brake light inspection, so they can help trace this issue for you.

I replaced the brake light switch. Gear lever unlocked because it had locked. Now the brakes feel hard.
ANSWER : Hi, thanks for writing in. You need to check the brake switch install adjustment. You may have the switch adjusted too tight and it is holding the the brake pedal partly down. This will cause the brake master cylinder to not release the brakes when you let off the pedal. Readjust the switch away from the pedal until you feel some free play again in the pedal. This should fix the problem. If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.