Do I need DOT 3 or DOT 4 brake fluid?
When it comes to maintaining your vehicle's braking system, the type of brake fluid you use is crucial. The two most common types of brake fluid are DOT 3 and DOT 4. Choosing the right one can be confusing, but this article will provide you with the information you need to make an informed decision.
What is the Difference Between DOT 3 and DOT 4 Brake Fluid?
The primary difference between DOT 3 and DOT 4 brake fluid lies in their boiling points. DOT 3 brake fluid has a lower boiling point, typically around 401°F (205°C) for the dry boiling point and 284°F (140°C) for the wet boiling point. DOT 4 brake fluid, on the other hand, has a higher boiling point, with a dry boiling point of around 446°F (230°C) and a wet boiling point of 311°F (155°C).
The higher boiling point of DOT 4 brake fluid makes it more resistant to heat, which is crucial in high-performance or heavily used braking systems. This is particularly important in vehicles that frequently tow heavy loads or engage in aggressive driving, as the brake fluid can become superheated, leading to a loss of braking power.
Which Brake Fluid Should I Use?
- For most passenger vehicles: DOT 3 brake fluid is generally sufficient, as it meets the minimum requirements for most standard braking systems.
- For high-performance or heavily used vehicles: DOT 4 brake fluid is the recommended choice, as it can better withstand the increased heat and pressure generated by more demanding braking systems.
- Always check your owner's manual: The manufacturer's recommendation should be your primary guide when selecting the appropriate brake fluid for your vehicle.
Regardless of which brake fluid you choose, it's essential to regularly check and replace it according to the manufacturer's recommended service intervals. Neglecting brake fluid maintenance can lead to a loss of braking performance and, in extreme cases, complete brake failure.
