What S The Difference Between Dot3 And Dot4 Brake Fluid

But standard vehicles don t need to handle as much heat so their braking systems are made with dot 3 brake fluid.

Dot3 is not so sensitive to water and outdoors. Dot 4 brake fluid has higher dry and wet boiling points making it safer for higher temperatures. Dot 3 brake fluids are much cheaper than dot 4 brake fluids the prices of these brake fluids are very reasonable. The dot 4 brake fluids are more expensive than any other types of fluids it costs approx three times more than the dot 3 brake fluids but its excellent properties make it worth the money.

However dot4 which has a low boiling capacity with water will not provide ideal performance. Dot 3 brake fluid is made from ether and polyalkyelen glycol being mixed together. Dot 5 brake fluid is silicone meaning it doesn t absorb water. And so its water absorption capacity is low.

The boiling point is categorized into wet and drypoints. Is it better to use dot 4. Using cheaper lower grade fluid increases the chances of your brakes failing in situations where they build up lots of heat e g driving down a mountain on a twisty road. Dot4 brake fluid has a higher boiling point than dot3 making the fluid less likely to boil.

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Dot 4 brake fluid. While dot 4 brake fluid has a higher boiling point. The primary differences between the two include the following. It is even formulated to be resistant to corrosion as well.

As we have just mentioned the most obvious difference between dot 3 and dot 4 brake fluid is the boiling point which is the temperature that the fluid evaporates. They are good for your engine and can last for a longer period. The wet boiling point of dot 3 brake fluid is 140 c and the dry boiling point of the same fluid is 205 c. This mixture creates a brake fluid that can handle wet conditions and average heated conditions.

Yes dot 3 brake fluid is compatible with dot 4 brake fluid. Steve discusses why people are quick to think that they do. This also impacts their water absorption but both of them are hygroscopic which means that they do. But since it has a lower boiling point dot 3 tends to absorb water.

Dot 3 brake fluid will absorb less water than dot 4 from the air over time meaning you ll need to have your fluid changed less frequently. However dot 4 offers a higher boiling point. Dot 4 brake fluid is preferred by many people because it can resist more heat in comparison to the weaker dot 3 brake fluid. Dot 4 brake fluid is made of borate and glycol.

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This mixture makes the brake fluid more stable and able to handle higher temperatures. In terms of their boiling point levels the difference between dot 3 brake fluid and dot 4 brake fluid can be highlighted below.