Is Brake Fluid Flammable?

Brake fluid is an essential component of a vehicle’s braking system, responsible for transmitting the force of the driver’s foot on the brake pedal to the brakes themselves.

However, many people are unaware of the potential hazards of brake fluid, including its flammability. In case of a brake fluid leak or spill, the fluid can ignite and pose a serious fire hazard.

In this article, we will look at brake fluid’s flammability, whether it is flammable or not, different types of brake fluid, and safety precautions for handling and storing it.

What Is Brake Fluid?

Brake fluid is a type of hydraulic fluid used in automobiles and other vehicles to transfer the force produced when the brake pedal is pressed to the brakes themselves. It is a critical part of the braking system, providing lubrication and protection against wear and tear. Without brake fluid, the brake system could not perform its role.

Components of Brake Fluid: Brake fluid comprises several components, including glycol ethers, polyalkylene glycols, and boric acid.

The glycol ethers are used as lubricants to create viscosity in the fluid, while the polyethylene glycols are used as corrosion inhibitors.

The boric acid helps to reduce the amount of water that can enter the system and cause corrosion.

How Brake Fluid Works: When the brake pedal is pressed, the force is transferred to the brake calipers. This force causes the brake pistons to move, compressing the brake fluid.

This pressure is transferred to the brake pads, which press against the rotors to provide the braking force.

Because brake fluid is a hydraulic fluid, it uses lubrication and corrosion inhibitors for protection. Without it, the brake system would be prone to wear and tear, making it more difficult to stop the vehicle.

In addition, brake fluid also helps to keep the system cool by providing a layer of insulation between the brake pads and the calipers.


Is Brake Fluid Flammable?

The short answer is yes. Brake fluid is flammable. All brake fluids are highly flammable and can easily catch fire when exposed to heat or spark.

This is why taking proper precautions when working with or around brake fluid is important. Brake fluids are usually made of a mixture of glycol ethers, esters, and petroleum-based oils.

Is Brake Fluid Flammable

These fluids are designed to be non-corrosive and have a high boiling point. But you need to be aware of the fact that they are flammable. It’s important to be extra cautious when working with brake fluid. Make sure to store it away from any sources of heat or sparks. And never attempt to refill the brake fluid reservoir without consulting a mechanic.

What Is The Ignition Point Of Brake Fluid?

Brake fluid is a hydraulic fluid used to provide lubrication and create pressure in the brake system. It is typically composed of glycol, water, and mineral oils.

The fluid transfers energy from the brake pedal to the brake calipers, activating the brakes. The boiling point of brake fluid is typically around 500 degrees Fahrenheit.

The brake fluid will reach its maximum viscosity and pressure at this temperature, allowing maximum braking power. If the brake fluid is heated beyond the boiling point, it will turn into a gas and ignite, becoming a potential fire hazard.

The ignition point of brake fluid is the temperature at which it will self-ignite. The ignition point is typically between 210-375 degrees Fahrenheit. The brake fluid will reach its flashpoint and begin burning at this temperature. Brake fluid is flammable and will burn when exposed to fire.

The fluid’s chemical composition determines the brake fluid’s ignition point. Different types of brake fluid will have different flashpoints, and the ignition point can be affected by the presence of oxygen, contaminants, or other chemicals in the brake system.

It is important to check the brake fluid regularly to ensure that it is not contaminated or oxidized, as these can reduce the flashpoint of the fluid and increase the chances of it catching fire.

Different Types Of Brake Fluids

There are several kinds of brake fluid, each with its properties and characteristics. DOT 3, DOT 4, DOT 5, and DOT 5.1 are the most commonly used types of brake fluid. Here’s a quick rundown of each:

DOT 3: This is the most common type of brake fluid in automobiles. It is a glycol-based fluid that works with the majority of brake systems. The boiling point of DOT 3 is around 401°F, with a minimum wet boiling point of 284°F.

DOT 4: Like DOT 3, DOT 4 is a glycol-based brake fluid that works with most brake systems. DOT 4 has a higher boiling point than DOT 3 and a minimum wet boiling point of 311°F.

DOT 5: DOT 5 is silicon-based brake fluid, unlike DOT 3 and DOT 4. It is incompatible with most brake systems and is typically found in high-performance or military vehicles. The dry boiling point of DOT 5 is around 500°F, and the minimum wet boiling point is 356°F.

DOT 5.1: Similar to DOT 4 but with a higher boiling point, DOT 5.1 is a glycol-based brake fluid. It has a wet boiling point of 356°F and a dry boiling point of around 500°F, making it ideal for high-performance vehicles.

Using the correct type of brake fluid for your vehicle is important, as using the incorrect type can result in decreased braking performance and potential brake system damage.

Your vehicle’s recommended brake fluid type can be found in your owner’s manual or by consulting a certified mechanic.

Is DOT 3 Brake Fluid Flammable?

Yes, DOT 3 brake fluid is flammable. It is an ethyl-glycol-based brake fluid containing various chemicals such as ethylene glycol and diethylene glycol. These chemicals have low flash points, so they can easily burn compared to other silicon-based fluids and ignite at high temperatures.

Brake fluid is corrosive and can damage painted surfaces, rubber, and plastic components and be flammable. It is critical to handle brake fluid with caution, to wear appropriate protective equipment, and to avoid getting it on your skin or clothing.

Is DOT4 Brake Fluid Flammable?

The fact that DOT 4 brake fluid is flammable does not mean it should be taken lightly. While it looks like a benign liquid, DOT 4 has low flash points and can ignite without warning when exposed to high temperatures.

Furthermore, this type of brake fluid has the potential to be just as hazardous as other materials due to its corrosive properties.

Brake fluid can damage anything from rubber to plastic parts, so it is important to exercise caution when handling it in the garage or under the hood of any vehicle. Wear protective gear and ensure no fluid comes into contact with skin or clothing.

Can Brake Fluid Cause A Fire?

Brake fluid can cause a fire if it comes into contact with an ignition source, such as sparks or flames. Brake fluid is a flammable liquid that can ignite at high temperatures, making it a potential fire hazard if improperly handled.

Taking precautions when handling brake fluid is important to minimize fire risk. This includes storing brake fluid in a cool, dry place away from sources of heat or flames, wearing appropriate protective gear such as gloves and eye protection, and avoiding smoking or using open flames where brake fluid is being handled.

Why Is Brake Fluid Hazardous?

It’s important first to understand what it is composed of. Brake fluid is a type of hydraulic fluid consisting mainly of polyglycol ethers, polyalkylene glycols, and polyalkylene glycol ethers.

These chemicals are highly corrosive and can cause skin irritation if they come into contact with human skin.

Additionally, they can damage rubber seals, corrode brake components, and cause brake fluid leaks.

Brake fluid is considered hazardous for several reasons. Here are a few key factors:

Flammability: Brake fluid is a liquid that can ignite at high temperatures. This poses a risk of fire and can be especially dangerous in the presence of sparks or flames.

Corrosiveness: Brake fluid can damage painted surfaces, rubber, and plastic components. This can lead to degradation and failure of brake system components, which can lead to loss of braking power and increased risk of accidents.

Health risks: Brake fluid can be harmful if it comes into contact with the skin or is ingested. It can cause skin irritation, burns, and other health problems. Ingesting brake fluid can cause nausea, vomiting, and other symptoms and can be life-threatening in severe cases.

Overall, it’s important to handle brake fluid carefully and follow the manufacturer’s instructions for storage, handling, and disposal.

This may include wearing appropriate protective gear, storing brake fluid in a cool, dry place away from heat sources, and properly disposing of used brake fluid to avoid environmental contamination.

Does Brake Fluid Burn Skin?

Brake fluid is a type of hydraulic fluid used in cars and other vehicles with brakes. It is typically made up of a mixture of glycol and polyglycol ethers and other additives such as corrosion inhibitors, anti-foam agents, and anti-wear agents.

The main danger with brake fluid is that it is highly corrosive. In other words, it can burn your skin if it comes into contact with it.

Brake fluid is so corrosive that it can burn through clothes and other materials in seconds.

If you come into contact with brake fluid, the first step is to wash the affected area with soap and water immediately. This will help to remove as much of the fluid as possible and help to reduce the risk of further damage.

If the affected area does not heal quickly or begins to blister, seek medical attention immediately. Burns from brake fluid can be serious and lead to infection or other complications if not treated properly.

Brake Fluid Flash Point

The flash point of brake fluid is the temperature at which the fluid will ignite when exposed to an open flame or spark.

This temperature is determined through laboratory testing and is an important factor in determining the quality and performance of a brake fluid. The higher the flash point, the more resistant the fluid is to ignition.

The flash point of brake fluid is generally between 500–600°F (260–316°C). It’s important to note that different types of brake fluid have different flash points, and there can be variations between brands and manufacturers. For this reason, it’s important to consult your vehicle’s owner manual to ensure you’re using the correct fluid.

Brake Fluid Fire Safety

Brake fluid is a critical component in a vehicle’s braking system, but it’s also a flammable liquid that can pose a fire risk if not handled properly.

Here are a few key tips for ensuring brake fluid fire safety:

Store brake fluid properly: Brake fluid should be stored in a cool, dry place away from sources of heat or flames. It should be kept in its original container and labeled appropriately to avoid confusion with other fluids.

Handle with care: When working with brake fluid, wear appropriate protective gear such as gloves and eye protection to avoid skin contact or eye irritation.

Avoid smoking or using open flames where brake fluid is being handled. And be careful while handling brake fluid near fire source or a heated element.

Keep work areas clean: Brake fluid spills should be cleaned immediately to avoid fire risk. Use absorbent materials such as paper towels or rags to clean up spills and safely dispose of them.

Check for leaks: Regularly inspect your vehicle’s braking system for leaks or other damage that could lead to brake fluid spills. Address any issues promptly to avoid a potential fire hazard.

Properly dispose of used brake fluid: Brake fluid should never be disposed of down the drain or in the trash. Instead, it should be taken to a recycling or hazardous waste facility for proper disposal.

By following these tips and using common sense, you can help ensure the safe handling and use of brake fluid, reducing the risk of fire and other hazards.


In conclusion, brake fluid is flammable, but the flammability is not as explosive as gasoline.  It’s highly unlikely for brake fluid to cause of the fire.

Electrical or gasoline-caused fire is far more likely. It is important to take precautionary measures to keep it away from extreme temperatures and flames and to check it regularly to ensure it is in good condition.

With the right safety measures, you can ensure your vehicle is safe and the brakes remain operational.