Why Is My Brake Fluid Light On And Off?

Car Warning Lights and Indicators. What Do They Mean? (Part 2
Car Warning Lights and Indicators. What Do They Mean? (Part 2 from www.carsome.my


One common issue that car owners may encounter is the brake fluid light turning on and off unexpectedly. This can be quite alarming, especially if you are not familiar with the inner workings of your vehicle. In this article, we will explore the possible reasons why your brake fluid light is behaving this way and what steps you can take to address the issue.

What Does the Brake Fluid Light Indicate?

The brake fluid light is an important indicator that alerts drivers to potential problems with their braking system. When this light turns on, it typically means that the brake fluid level in the reservoir is low. This can be due to a leak in the system or simply because the fluid needs to be topped up. It is crucial to address this issue promptly to ensure the safety and functionality of your brakes.

Reasons for the Brake Fluid Light Turning On and Off

1. Low Brake Fluid Level

The most common reason for the brake fluid light turning on and off is a low fluid level in the reservoir. This can occur due to normal wear and tear or a leak in the system. It is important to check the fluid level regularly and top it up if necessary.

2. Faulty Brake Fluid Sensor

In some cases, the brake fluid light may flicker or turn on and off due to a faulty sensor. The sensor is designed to detect the fluid level and send a signal to the dashboard light. If the sensor is malfunctioning, it may give false readings, causing the light to behave erratically. A professional mechanic can diagnose and replace the faulty sensor if needed.

3. Air in the Brake System

If air gets trapped in the brake system, it can cause the brake fluid light to turn on and off. Air can enter the system during brake fluid replacement or due to a leak. Bleeding the brake system can help remove any trapped air and restore proper functioning.

4. Loose or Damaged Wiring

Another possible reason for the brake fluid light flickering is loose or damaged wiring. If the wiring connecting the sensor to the dashboard light is loose or frayed, it can cause intermittent signals, resulting in the light turning on and off. Inspecting and repairing the wiring can resolve this issue.

Steps to Address the Brake Fluid Light Issue

If you notice that your brake fluid light is turning on and off, it is important to take appropriate action to ensure your safety on the road. Here are some steps you can follow:

1. Check the Brake Fluid Level

Start by checking the brake fluid level in the reservoir. If it is low, top it up with the recommended brake fluid. Make sure to use the correct type of fluid specified in your vehicle’s manual.

2. Look for Leaks

Inspect the brake system for any signs of leaks. Common areas to check include the brake lines, calipers, and master cylinder. If you notice any leaks, it is advisable to have them repaired by a professional mechanic.

3. Check the Sensor and Wiring

If the fluid level is adequate and no leaks are present, it is important to have the brake fluid sensor and wiring checked by a professional. They can diagnose any faults and replace the necessary components to resolve the issue.

4. Bleed the Brake System

If air in the brake system is suspected, bleeding the brakes can help remove the trapped air. This process involves releasing the air from the system by opening the bleeder valves on each brake caliper or wheel cylinder. It is recommended to consult a professional mechanic for this procedure.

5. Seek Professional Help

If you are unsure about the cause of the brake fluid light turning on and off, or if you are uncomfortable performing the necessary repairs yourself, it is best to seek the assistance of a qualified mechanic. They have the expertise and tools to diagnose and fix the issue correctly.


The brake fluid light turning on and off can indicate various issues with your braking system. It is important to address this problem promptly to ensure your safety on the road. By checking the fluid level, inspecting for leaks, and seeking professional help if needed, you can resolve the issue and maintain the functionality of your brakes.