Difference Between DOT 3 and DOT 4?

Components from DOT 3 and DOT 4 are mainly used for braking systems, which we have often seen in modern-era vehicles related to two-wheelers, three-wheelers, or four-wheelers. In fact, DOT 3 and DOT 4 are the types of braking fluid used in the braking system. The brake fluid that we use in the braking system is mainly related to the process of the hydraulic system. This fluid helps in applying the brakes by performing the hydraulic process.

Earlier we used to use drum brakes, but to improve the braking system, disc or hydraulic brake systems were used where many types of braking fluid systems are being used, out of which DOT3, DOT4, DOT5, DOT5.1. These are all types of braking systems. Today in this article we will learn about the difference between DOT3 and DOT4 and which of them would be appropriate for us to use!

What is the meaning of the words DOT used in DOT 3 and DOT 4?

The full form of the word DOT is Department of Transportation, which indicates the boiling point of the fluid present here! Also, it specifies the safety rules for the acceptable performance of different brake system fluids. These DOT ratings depend on the dry and wet boiling points of the liquid.

The Baseline Difference Between Dot 3 and Dot 4 Braking Fluid-

Here we will understand how Dot 3 is different from Dot 4 braking fluid. Which is the best part of this article.

If we discuss the things related to the boiling point, then the boiling point of dot 3 is much better than the bowling point of dot 3. Dot 3 boils easily, which is why dot 4 is much better for the braking system.

DOT 3 brakes consist mainly of fluid ether and polyalkaline glycol and DOT 4 brake fluids are composed of borate and glycol, mainly affecting viscosity. Also, Dot 4 brake fluid has a very high viscosity, hence its life span is also very long. That’s why the Dot 4 performs better even in very high temperatures.

Dot 4 brake fluid absorbs more fluid with air and dot 3 brake fluid absorbs work fluidly with air, which means water work in dot 3 brake fluid has to be changed. It is actually Dot 4’s high dry and wet boiling points that characterize it.

If you understand the use of Dot 3 and Dot 4 brake fluid, then mainly the Dot 3 type of brake fluid can be used in general for home or office vehicles. But dot 4 brake fluid is used for heavy engines like sports-type vehicles or commercial vehicles because dot 4 brake oil has good viscosity.

Generally, the reason for rusting in machines is the presence of moisture and oxygen in the air, which interact with each other to rust the machines. This action of corrosion also affects Dot 3 and Dot 4 brake fluid. In fact, these brake fluids protect the system from heat, and glycols are found in these brake fluids, whose job is to protect the system from moisture, which also protects these systems from rusting. That is why the brake suspension is good.

If we talk about compressibility, then we can classify dot 3 and dot 4 brake fluid by matching it to the boiling point and viscosity. Generally speaking, Dot 4 has a better boiling point and viscosity than Dot 3, so the compressibility of Dot 4 will be better than Dot 3 brake fluid.

So in this article, we have seen that there are many differences between dot 3 and dot 4 brake fluid in general and also technically. It would be appropriate to use them. By looking at these differences, we cannot use both brake fluids in place of each other. Differences have also been found in their compressibility from their boiling point, so it becomes necessary to change it at every interval. It is also necessary to maintain the flexibility of the system so that our system does not get damaged.

Also, special care should be taken with its maintenance so that there is no problem using it. In this article, dot 3 and dot 4 braking fluid are explained in a much better way. All those things have been mentioned and should be kept in mind while using them. Apart from this, if you need any information regarding auto parts or auto parts stores, then you can visit the online site of Carorbis where you can also enjoy reading many blogs related to them.


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