4 Types of Car Brake Fluid and How to Choose the Right One for Your Vehicle
Brake fluid plays a crucial role in maintaining the performance of a car’s braking system, which is essential for safe driving.
Different types of brake fluids are available on the market, each with its own characteristics and quality that directly affect the condition and durability of the braking components.
By choosing the right brake fluid, your car's braking system can function optimally, improve braking power, and reduce the risk of overheating. So, what are the types of brake fluids for cars? Let’s take a closer look!
4 Types of Car Brake Fluid and How to Choose the Right One for Your Vehicle
Below are several types of car brake fluid you can choose for your vehicle, complete with their pros and cons. Keep reading to learn more!
1. DOT 3
The first type of brake fluid for cars is DOT 3, which contains glycol ether and has the main characteristic of being water absorbent or hygroscopic. Even though it absorbs water, the fluid’s consistency remains the same after mixing.
DOT 3 has the lowest boiling point compared to other brake fluids at around 206 degrees Celsius.
However, DOT 3 must be replaced regularly. If not, it can damage natural rubber parts, car paint, and even cause rust to form.
2. DOT 4
DOT 4 is commonly used in older cars with braking systems that generate higher heat.
This type of brake fluid is easy to find and has a higher boiling point than DOT 3 at around 230 degrees Celsius for dry and 155 degrees Celsius for wet.
DOT 4 is also made from glycol ether but has a lower hygroscopic nature, meaning it absorbs less water. However, it still has the potential to damage paint and cause corrosion within the braking system.
In terms of price, DOT 4 is more expensive than DOT 3, but it offers better heat resistance and is suitable for vehicles with high performance braking needs.
3. DOT 5
Unlike DOT 3 and DOT 4, DOT 5 is silicone-based, which means it does not absorb water and has a higher boiling point.
This makes DOT 5 ideal for all types of rubber brake parts and for use in humid environments.
On the downside, DOT 5 has lower lubricating properties and requires more effort when braking.
It’s also important to note that DOT 5 cannot be mixed with glycol-based fluids like DOT 3 or DOT 4. Therefore, the braking system must be completely flushed before switching to DOT 5.
4. DOT 5.1
Another type of brake fluid for cars is DOT 5.1, which is an upgraded version of DOT 5.
DOT 5.1 is formulated with borate ester and glycol ether, providing enhanced performance and higher resistance to extreme temperatures.
Like DOT 5, it has a high boiling point and can perform well under demanding conditions.
What sets DOT 5.1 apart is its better compatibility with modern braking systems and improved efficiency in maintaining braking stability.
This advanced formulation overcomes the limitations of DOT 5, offering more reliable protection for braking components and ensuring consistent brake response over longer periods.
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