Car Brake Light Circuit, Components and How It Works

As you know, the car's brake lights function to enhance safety and prevent accidents. Therefore, you need to maintain the condition of the brake light circuit along with its supporting components so that the brake lights can function properly. Below, we will explain the circuit of the car's brake lights, the components, and how they work. Here is a complete review.

Car Brake Light Circuit and How It Works

The brake light circuit is divided into two types: the positive control brake light circuit with the help of a relay and without a relay. For more details, please refer to the following review.

1. Brake Light Circuit with Relay

In this circuit, the car's brake lights use a relay to turn on. When you press the brake pedal, the brake switch will send an electric current to terminal 85 of the relay.

This condition causes the relay coil to receive electric current from terminal 85 of the relay. At the same time, the battery component sends electric current from the positive terminal to the fuse. The electric current from the fuse will then be forwarded to terminal 30 of the relay and the brake switch.

Next, this condition creates an electromagnetic force that activates the relay at terminals 87 and 30. Thus, the car's brake lights can turn on properly.

However, when you release the brake pedal, the brake switch will automatically cut off the electric current to the relay terminal, causing the brake lights to dim again.

2. Brake Light Circuit without Relay

In this circuit, the electric current from the positive terminal of the battery is directly sent to the fuse. Then, this electric current is sent to the brake switch.

So when you press the brake pedal, the brake switch will automatically send electric current to the brake lights, causing them to turn on. Meanwhile, if you release the brake pedal, the electric current from the brake switch will be cut off automatically. As a result, the light produced by the brake lights dims.

Components of the Brake Light Circuit

The functioning brake lights of a car are inseparable from the following components.

1. Car Battery

Its function is to store and supply electric current to activate all car lights, including the car's brake lights.

2. Fuse

Its function is to cut off electric current that is too high, thus preventing electrical short circuits.

3. Brake Switch

Its function is to connect and disconnect electric current from the battery to the car's brake lights.

4. Brake Pedal

Its function is to connect the brake light circuit so that it can turn on and slow down the car's speed while driving.

5. Wires

Its function is to connect electric current to the components of the car's electrical system in the brake light circuit.

6. Brake Lights

Its function is to produce light from the bulb filament when you are pressing the brake pedal.

Hazards If the Brake Light Circuit Has Issues

Here are some hazards that can arise if the car's brake light circuit has issues.

1. Brake Lights Stay On Continuously

Problems in the brake light circuit can cause the rear brake lights to stay on continuously. This condition can disrupt the comfort of other road users. Additionally, it can cause several components in the car's electrical system to wear out quickly.

2. Brake Lights Are Off

Moreover, issues in the brake light circuit can cause the car's brake lights to be off. This can threaten your safety because drivers behind you may not be aware of your car's braking signals. Thus, the risk of being hit is greater.

To ensure your safety, visit a workshop or the nearest Daihatsu dealer to address your car's issues, including problems with the brake light electrical circuit.

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