Brake Light Switch Diagram

A brake light switch diagram is a helpful way to see how the brake light system works on a car. It can help you troubleshoot problems with the brake lights or understand how the system works. In this blog post, we will provide a brake light switch wiring diagram and explain how the system works.

When it comes to the safety of you and your family, it’s important to know how every system in your car works. This blog post will explain how the brake light switch works and what to do if it stops functioning properly.

Brake light switch diagram 2024 Updated

Brake light switch diagram

Most modern trucks have a brake light switch. It is usually located behind the brake pedal at the top. There are three common brake light switch types: 2-pin, 4-pin, or 6-pin. Each of these switches looks slightly different, which can be confusing.

However, below we will provide a basic brake light switch wiring diagram for each so you can know exactly what you are dealing with.

2-pin basic brake light switch wiring diagram

2-pin basic brake

The two-pin style of brake switch is the simplest. It comprises positive and negative connections and operates only the brake lights. Pressing the brake pedal operates the switch and completes the circuit switching on the brake lights.

4-pin basic brake light switch wiring diagram

4-pin basic brake light

In the four-pin brake light switch diagram, pin 3 refers to the ground connections. Pin 4 provides a battery positive 12 Volt supply. Pin 1 operates the brake lights, and pin 2 sends a signal to the vehicle computer.

6-pin brake pedal switch simple brake light circuit diagram

6-pin brake pedal switch simple brake light

As shown in the diagram above, the six-pin brake lamp switch has several functions. This is an all-in-one switch that also includes cruise control, which means that on vehicles with a 6-pin brake light switch, there is no need for any other switches on the brake pedal.

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How does a brake light switch work?

When you hit the brakes in your car, the brake light switch tells the brake lights to come on so that the driver behind you knows to slow down.

The switch is usually located near the pedal itself and is usually activated when the pedal is depressed. The switch completes a circuit between the power source and the brake lights when activated.

This illuminates the brake lights and warns the driver behind you to take caution. While they may seem simple, brake light switches are an essential safety component of every car.

Brake lights are an important safety feature that helps to warn other drivers when the vehicle ahead is stopping.

In some cases, the switch may also activate other safety features, such as a rear-view camera or an automatic brake system.

For this reason, it is important to ensure that the brake light switch is in good working order before hitting the road.

How is a brake light switch wired?

How is a brake light switch wired?

The switch is usually wired so that the circuit is only completed when the pedal is fully depressed, ensuring that the brake light comes on only when the brakes are used.

In some cars, the stoplights and taillights are wired through the brake light switch, so they also come on when the brakes are applied. This helps to make the car more visible to other drivers and can help to prevent accidents.

If you are working on a vehicle braking system and have determined that the problem stems from either the brake light switch or its wiring, you will need to know how it is wired. The first thing you must do is find the fuse that sends power to the switch.

Once you have done this, use a multimeter to check the power on either side of the fuse. If you discover power on one side of the fuse but not the other, then you know the fuse is faulty.

If you discover power on both sides of the fuse, the next step is to use your multimeter to ensure power is getting from the fuse to the switch.

Now you should have determined whether there is power at the switch. To test whether the switch is faulty, you must use your multimeter while operating the brake to discover whether the power is going through the switch.

If there is power on the other side of the switch when you operate the brakes, then you know the switch is not faulty. However, if there is no power, you now know that the switch should be replaced.

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How do I know if I have a faulty brake switch?

The main symptom of a faulty brake switch is a failure of your brake lights. Your vehicle brake lights are a very important component that reduces the risk of an accident.

Brake lights should be inspected regularly for any signs or symptoms suggesting failure. Some of these symptoms include flickering, dimming, and possibly non-lighting.

A safety feature in most modern automatic transmission vehicles makes it impossible to start the engine without first pressing the brake pedal.

If your brake switch is faulty, the vehicle cannot tell whether the brake has been depressed. This usually means that the vehicle will not start.

Hopefully, a member of your family or another driver will alert you to an issue with your brake lights before it becomes a problem. However, checking whether your brake lights are working yourself is also possible.

When pressing the brake pedal while looking in the rearview mirror, you should see an increase in light intensity.

It is also possible to back your vehicle up to a wall or garage door and, again, looking in your rearview mirror, check for an increase in light intensity.

Faulty brake light or brake light switch?

Faulty brake light or brake light switch?

As the symptoms of a faulty brake light or brake light switch can be very similar, it is difficult to know which to replace. We advise that the best thing to do is to start with the brake lights.

Replacing the brake lights usually will not cost more than a couple of dollars. It is usually possible to check if brake lights are faulty by holding them up to the light and looking for broken filaments or cracks.

If both your bulbs seem in good condition and the brake lights are still not working, your next step will be to look into replacing the brake light switch.

How much does it cost to replace a brake light switch?

The cost to replace a car brake light switch will vary depending on the make and model of the vehicle.

However, the average cost is between $50 and $100. The brake light switch is located on the brake pedal and turns on the brake lights when the pedal is depressed.

Over time, the switch can become worn out, causing the brake lights to stay on or not come on at all. If the switch is not working properly, it can be a safety hazard for the driver and other motorists.

Replacing the switch is relatively simple, and most mechanics can do it in about an hour. As a result, it is important to have the switch checked periodically to ensure it is functioning properly.

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What are the two switches on my brake pedal?

In some vehicles, you will find two switches on the brake pedal. As we have already discovered, the first is the brake light switch. The brake light switch has an important safety function as it activates and deactivates the brakes when you use them.

The second switch you may find on your brake pedal is the cruise control release switch. Cruise control is a feature that allows drivers to maintain a constant speed without having to press the accelerator pedal continuously.

While it can be a useful tool for highway driving, it is important to be able to disengage cruise control quickly when necessary. The cruise control release switch will turn off the cruise control when the brake pedal is pressed.


Brake light switches are an important part of your car and should be kept in good condition. We’ve got you covered if you’re looking for a brake pedal switch simple brake light circuit diagram.

If you have any questions or problems with your brake lights, take your car to a mechanic as soon as possible. Thanks for reading!

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