Cause the brake light fluid indicator is on

Cause the brake light fluid indicator is on – Before I write this article, I have written another article like this before; 2 Causes and Signs of Low Brake Fluid. On it, I showed you that brake pads and brake shoes were one of the most often brake light fluid indicator is on. But, in fact, the brake light fluid indicator is ON has other causes. That’s why I continue the article at this moment to complete the reason why brake light fluid is on. Let’s start!

Cause the brake light fluid indicator is on

Cause the brake light fluid indicator

Car brakes are improving day by day. Until now, the car brakes have reached the stage of regenerative brakes. Which means that the mechanical energy from braking the car can be converted into electric power. This electric power can then be added to mechanically balanced power in the battery. This fits perfectly with hybrid cars or electric cars.

But before regenerative brakes came along, fluid brakes became an important part of a vehicle’s safety system. Fluid brakes, whether they apply drum brakes or disc brakes, both use brake fluid to transfer braking power from foot pressure to the wheels. This system will usually be complete with a brake indicator located on the dashboard along with other indicators on the car. If you experience one or more problems, the indicator light is useful as an informant to inform that a problem is occurring in the car’s braking system. But where exactly is the problem with the brakes so that the indicator light comes on?

Here are the parts that may be damaged and the brake indicator light on because of it.

Low Brake Fluid

The car’s braking system is currently in the regenerative braking stage. A braking system in which the result of mechanical energy is converted into electrical energy which is stored in the battery. This system is usually found in electric cars. However, many still use a hydraulic braking system. A system that uses brake fluid media to transmit foot braking pressure to the vehicle’s wheels.

Cause the brake light fluid indicator
There are minimum and maximum marks on the brake fluid reservoir tube. Fill brake fluid between the marks. If more then it will come out and damage the paint, if less then the brake indicator light will light up. Source:

Brake fluid will function properly when the right type of brake fluid is used and the amount in the system is adequate. There are maximum and minimum limits on the brake fluid reservoir tube. If it is less than the minimum level then the brake indicator light will light up.

Simply by adding brake fluid to the maximum level, the indicator light will turn off. To find out more about the type of brake fluid and why if it decreases the brake indicator light can come on, please read further: brake light fluid indicator and its relationship with brake fluid.

Brake fluid leakage

Leaking brake fluid will reduce brake fluid and become a serious problem. If this happens, it is mandatory for you to fix it immediately. Brake fluid leaks can cause any brake system to fail. The safety of you and whoever drives your car is at stake.

For the problem of brake fluid leakage, you must do a proper and accurate check to find the location of the brake fluid leak because there are quite a lot of components in the brake system that are related to brake fluid.

Cause the brake light fluid indicator
For one reason or another, brake fluid can leak through certain sections along the brake fluid path from the master cylinder to the wheel cylinder. If this happens, some cars will indicate that the brake indicator light on the dashboard is on.

However, there are components in the brake system that most often experience brake fluid leakage, which is in the following position.

  1. Brake master cylinder (located in the engine compartment)
  2. Brake calipers (for disc brake systems on the front wheels)
  3. Wheel cylinders (for drum brake systems on rear wheels)
  4. Load sensing proportional valve (usually located under the car close to the rear brake)
  5. Brake hoses on each wheel

It is advisable to check for brake fluid leakage by a certified technician or mechanic to ascertain which part of the brake is damaged and what actions are appropriate for brake fluid leakage. To find out the characteristics of a brake oil leak, click here!

The brake pads and brake shoes are worn

When you see brake fluid in a low position, try to pay attention to the condition of the brake pads. Wearing brake pads often causes the brake fluid to run low. It should be noted that brake fluid is used to push the pistons into the brake calipers.

The thickness of the brake pads greatly affects the amount of brake fluid in the calipers. The thicker the brake pads, the less fluid there is in the calipers. Vice versa, thin and worn brake pads cause the calipers to require more brake fluid.

Cause the brake light fluid indicator
The components that rub against each other most often and without lubrication are brake pads and brake shoes. Thus, it will often experience wear and tear. Unfortunately, if the brake shoes and pads wear out, the brake indicator light may also come on (in some cases cars).

When the brake pads are worn, the brake piston will be pushed forward more. This results in more space in the brake caliper which must be filled with brake fluid.

In this case, you must check the condition of the brake pads. If it is very worn out, you should replace the brake pads. However, if the brake lining is still in good condition, you can simply add a sufficient amount of brake fluid to the reservoir tube. In fact, you can learn the signs of worn brake pads or shoes.

Problem on the parking brake

Cause the brake light fluid indicator
Land Rover LR3 parking brake switch.

The parking brake is the device that prevents a vehicle from moving while it’s in gear. It can be manually engaged by pushing on and pulling back on the handbrake lever, or automatically disengaged when you put your car into gear (most vehicles have this function). However, sometimes the parking brakes need to be released for various reasons such as if there are any air bubbles trapped inside of them because they become too hard due to overheating.

There is another reason besides this, namely the switch on the parking brake has a problem. This condition seems to always occur braking with the parking brake. To fix this, usually have to replace the parking brake switch.

ABS Sensors

Cars over the 2000s seem to have used the ABS braking system (anti-lock brake system). This braking system is very good for the safety of the driver when passing through wet, sandy, gravel roads, or in general, the vehicle passes through slippery roads. When the driver applies the brakes in such road conditions, the wheels equipped with sensors will not lock. Thus, the wheels will not slip and the vehicle as a whole will not slip either.

Cause the brake light fluid indicator
As a fluid pressure regulator in the ABS system, automotive companies usually include an ABS module in the braking system line. With this electronic module, the oil pressure will be precise according to the power required by each wheel.

Cars currently use full-ABS. I say so because ABS sensors or wheel sensors have been installed on all wheels. Both vehicles with front-wheel drive and rear-wheel drive, all use sensors.

The problem is that if this sensor is damaged or simply malfunctions due to being submerged in water, for example, the brake indicator light will light up. This gives inconvenience to the drivers of these vehicles because they feel the brakes are still working but the indicator light is on. To overcome this, one must know which sensor is damaged and must replace it with a new one.

To find out more about ABS sensors and their symptoms, please continue reading here!


Every vehicle owner realizes that the brakes are the main safety system in a car. And they also understand that if the brake indicator light is on, it means there is a problem. Therefore, do not ignore the brake indicator light because as I mentioned above, brake problems can occur in many parts. In fact it’s just the brake fluid in the reservoir tube is reduced or lower than the minimum level.

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