1/8/2024 0 Comments Dot 3 brake fluidUnfortunately, its wet boiling capacity is not so great. This means the fluid will work well when it’s exposed to water and the open air.ĭOT 4 braking fluid is best when it comes to a dry boiling capacity. #4 – Boiling CapacityĭOT 3 braking fluid contains both a great wet boiling capacity and dry boiling capacity. Always follow the vehicle manufacturer’s recommendation as to what type of brake fluid to use. However, you can expect to see DOT 4 braking fluid in police cars, motorcycles, and racing cars since they all brake more frequently and aggressively. The average economy car will use DOT 3 braking fluid because in general, the cars require less stopping power and the driver won’t be braking aggressively very often. This mixture makes the brake fluid more stable and able to handle higher temperatures. This mixture creates a brake fluid that can handle wet conditions and average heated conditions.ĭOT 4 brake fluid is made of borate and glycol. #2 – Chemical ComponentsĭOT 3 brake fluid is made from ether and polyalkyelen glycol being mixed together. Car owners who are involved in autocross or lapping days at the track will definitely require a brake fluid with a high boiling point. If you tend to do a lot of heavy braking with your vehicle, then DOT 3 brake fluid could easily boil which would result in the complications noted above.ĭot 4 brake fluid is more reliable when you’re regularly doing a lot of heavy braking because it doesn’t boil as easily. See Also: DOT 5 Brake Fluid Compatibility #1 – Boiling PointĭOT 4 brake fluid has a higher boiling point than DOT 3 brake fluid. Here are the main differences between the two types of fluid. There is DOT 3 brake fluid and DOT 4 brake fluid. There are two main different types of brake fluid that are used by most auto manufacturers. Differences Between DOT 3 and DOT 4 Brake Fluidĭifferences Between DOT 3 and DOT 4 Brake Fluid.
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