What is the difference between Honda DOT3 and DOT 4?
Brake fluid is a critical component of a vehicle's braking system, and it's important to use the right type for your Honda. The main difference between Honda DOT3 and DOT4 brake fluids lies in their boiling points and compatibility with various brake system components.
Honda DOT3 Brake Fluid
Honda DOT3 brake fluid is a glycol-based fluid that has a lower boiling point compared to DOT4. DOT3 has a minimum dry boiling point of 401°F (205°C) and a minimum wet boiling point of 284°F (140°C). This makes it suitable for most standard brake systems, but it may not be able to withstand the higher temperatures generated in high-performance or heavily used braking systems.
Honda DOT4 Brake Fluid
Honda DOT4 brake fluid is also glycol-based, but it has a higher boiling point than DOT3. DOT4 has a minimum dry boiling point of 446°F (230°C) and a minimum wet boiling point of 311°F (155°C) This higher boiling point makes DOT4 more suitable for vehicles with high-performance braking systems, such as those found in sports cars or heavily loaded trucks.
Key Differences
- Boiling Point: DOT4 has a higher boiling point than DOT3, making it better suited for high-performance or heavily used braking systems.
- Compatibility: DOT3 and DOT4 are generally compatible, but it's best to use the type recommended by your Honda's manufacturer to ensure optimal performance and safety.
- Cost: DOT4 brake fluid is typically more expensive than DOT3, but the higher cost is often justified by the improved performance and safety in high-stress braking applications.
In summary, while both Honda DOT3 and DOT4 brake fluids are suitable for use in Honda vehicles, the choice between the two depends on the specific requirements of your vehicle's braking system. Always consult your owner's manual or a qualified mechanic to determine the appropriate brake fluid for your Honda.
Can we mix DOT 3 and 4 brake fluid?
Yes. DOT 3 and DOT 4 are both glycol ether based, and will mix just fine. DOT 4 has a higher boiling point, so depending on the application, it may be necessary to use that instead of DOT 3. Do not mix DOT 5 with either of them, as it is silicone based.
What brake fluid should I use for a motorcycle?
DOT 3, DOT 4, DOT 5, and DOT 5.1:
These specifications are set by the U.S. Department of Transportation and are common on motorbikes manufactured in North America. DOT 3, DOT 4 and DOT 5.1 fluids are glycol based and are hygroscopic (moisture absorbing). DOT 5, on the other hand, is silicone based and non-hygroscopic.
Do I need to use genuine Honda brake fluid?
You should trade out your brake fluid at least every three years with Honda Genuine Brake Fluid because with lots of use it can become contaminated and lose effectiveness. The high quality of Honda Brake Fluid will ensure that it lasts and delivers the safety you rely on.
Are DOT 3 and 4 compatible?
For example, a braking system that has a brake fluid DOT 3 specification can use a DOT 4 or a DOT 5.1 fluid. Also, a system with a DOT 4 can be topped up with a DOT 5.1 without bleeding the system. However, never top up a DOT 4 system with a DOT 3 brake fluid.
Can you use any DOT 3 brake fluid in Honda?
Always use Genuine Honda DOT 3 brake fluid. If it is not available, you should use only DOT 3 or DOT 4 fluid, from a sealed container, as a temporary replacement. However, the use of any non-Honda brake fluid can cause corrosion and decrease the life of the system.
What is the difference between Honda brake fluid DOT 3 and DOT 4?
DOT 3 and DOT 4 brake fluids are interchangeable for the most part. DOT 4 has a slightly higher boiling point. 230C for the DOT 4 vs 205C for the DOT 3. Unless you have a high performance car and like to overwork the brakes, you will likely not have a need for the higher boiling point DOT 4.
Do Hondas require special brake fluid?
The simple answer is yes.
Can I use DOT 3 instead of DOT 4?
Yes. DOT 3 brake fluid is compatible with DOT 4 brake fluid. However, DOT 4 offers a higher boiling point. DOT 5.1 is used in high-performance and heavy-duty applications due to its high boiling point.
How do I know if I need DOT 3 or DOT 4 brake fluid?
Daily driving or commuting – DOT 3 is typically sufficient for light, everyday use where brake temperatures stay moderate. Towing, heavy loads, or mountainous driving – DOT 4 or DOT 5.1, with their higher boiling points, are better suited for these conditions to prevent brake fade.
Can I use DOT 3 instead of DOT 4 in my motorcycle?
DOT 3 and DOT 4 brake fluids are interchangeable for the most part. DOT 4 has a slightly higher boiling point. 230C for the DOT 4 vs 205C for the DOT 3.
